Qlogic SANbox 6142 Supplementary Manual

Brand: Qlogic

Model: SANbox 6142

Type: Supplementary Manual

This manual is also suitable for

W H I T E P A P E R

Executive Summary

A new challenge faces IT professionals, dubbed the corporate

“extrastructure.” This includes devices and technologies outside

the IT department’s direct control, but are vital to the proper

operation of dispersed SANs and data resources. For example,

most corporations rely on third-party vendors for the bandwidth

and connectivity technology outside of the brick-and-mortar

confines. Since implementing a private global WAN would be cost

prohibitive, the company needs to bridge data centers without

sacrificing the benefits of a single-site operation.

The best way to mitigate the limitations of a decentralized data

environment is to create a core-to-core bridging strategy using

standard, proven technologies. Core-to-core bridging is the

QLogic term for linking the core networks between data centers.

Data center switches, such as the SANbox 9200, can access

remote SAN islands with the proper deployment of gateway

routers. The SANbox 6142 Intelligent Storage Router can bridge

core switches across the WAN with fast and efficient Layer 3

routing. The routing can even be easily implemented across core

switching technologies from other vendors, for example Brocade

and Cisco.

Mission critical applications, such as data migration, replication,

and disaster recovery, can now be integrated across multiple

sites for better utilization, higher levels of protection, and faster

recovery times.

Key Findings

The SANbox product family can implement a cost-effective and

efficient data center core-to-core bridging strategy to achieve the

following solutions:

Greater resource utilization in SAN islands

Higher data protection levels with off-site migration,

replication, and disaster recovery

Better operational efficiencies

Faster gateway bridging across homogeneous and

heterogeneous SAN fabrics

Easier management of remote data resources

Core-to-core fabrics can be bridged without merging SANs

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Extending the SAN Beyond the Data Center

Extending the SAN for SANbox 9000

Core Switches

QLogic Intellegent Storage Routers

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Introduction

The corporate infrastructure has evolved over the past few decades

to the point where “infrastructure” no longer provides an adequate

definition. With global offices, remote locations, and a dispersed sales

force, the computing environment now requires an “extrastructure”

to provide data when and where it’s needed. The extrastructure is

much different than an infrastructure because so much of the WAN

connectivity is beyond the control of the IT professional. This paper

looks at best practices for implementing distance connectivity

topology that still maintains the requirements for flexibility, speed

and management available within the data center.

The standard data center architecture consists of servers at the

edge of the Fibre Channel SAN connected to data storage through

distribution and core switches. System administrators can easily

design, control, and manage this environment. However, when they

need to connect multiple data centers, system administrators must

investigate and properly evaluate each one with their own edge-to-

core topology, new challenges, and criteria. This paper investigates

the options for creating core-to-core SAN solutions.

An intelligent storage router can provide SAN-over-WAN connectivity

to extend the data center core beyond a single location or campus

environment. This can be done while still maintaining all of the data

center requirements mentioned above. This allows for a unified

business approach to computing needs and data access. Not that

all users in all locations gain unlimited access, but the policies

and procedures required to run a sound business can be extended

beyond the headquarters or main data center to all users throughout

the enterprise.

There are three basic segments to managing the extrastructure:

Capacity allocation approach – Too often, departments and/or

locations demand storage capacity for the wrong reasons. They

“what if” themselves into deploying excess capacity: “What if we

grow faster than expected? What if the requirements were under

estimated? What if we have a surge in peak demand?” A capacity

allocation approach focuses on assigning data storage when and

where it’s needed.

Centralized management approach – An IT department spends

a great deal of time implementing policies and procedures that

guard the company against pitfalls of intrusion, collusion, and

regulation. However, these safeguards are difficult to manage

and enforce across a fractured extrastructure. A centralized

management approach focuses on standard management

policies across the extrastructure.

Distributed network approach – Even though many companies

have basic connectivity between remote offices and sites, the

capabilities of the global network remain fractured. Each office or

data center operates as an independent island within the larger

scheme of data management and resource sharing. A distributed

network approach focuses on high-speed resource sharing

between SAN islands.

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Business Needs within the Extrastructure

Data protection – After keeping applications available to run the

business, the most important function of the corporate IT department

is to secure and protect the data assets of the institution. Growing

data and expanding extrastructure push operating scenarios and

data systems to the limit. The opportunity cost of lost data could be

catastrophic to the company.

Regulatory compliance - Across the globe, changing regulatory

requirements from most governments place greater demands on

businesses. The data outlined by these regulations is often outside

of the data center, but needs to be protected, secured and accessed

globally. US regulations such as SEC 17a-4, Sarbanes Oxley section

404, and HIPAA drive the need for new storage strategies in every

organization. This means that those servers, and the storage that

supports them, need data protection and management capabilities,

often associated with enterprise SANs, traditionally found only in

central IT departments.

Resource limitations – Shrinking IT budgets require that utilization

and leveraging of available resources be maximized. Redundancies

or over capacity from one SAN island to another can’t be tolerated.

Bridging and sharing existing data devices can help ease the burden

on equipment and management.

Evaluation Factors for Building the Extrastructure

The next step is to assess the requirements of the SAN-over-

WAN application. To help define the requirements of your specific

application, consider the following:

Data Targets – The volume of the target data is fundamental

for establishing the performance requirements of the WAN

connections.

Availability Requirements – Does the connection need to be a

“best effort” or 24/7? This is key when determining the type of

software, equipment, and WAN connection to implement.

Write Transfer Objective – How much time is available to transfer

the data? This is one of the key factors in determining the size

and/or number of telecommunication lines needed.

Recovery Time Objectives (RTO) – How fast does the data have

to be recovered? How often do you think you will have to do this

recovery?

•

Budget – Examine not only the cost of the networking equipment,

extra disk storage, and required software, but also look at ongoing

WAN line cost to get a full TCO/ROI analysis.

Data Access Model - What kind of data access is required

asynchronous or synchronous transfers? If asynchronous

is acceptable, using it can lower the cost and performance

requirements, instead of accommodating peak synchronous

demands.

By answering the above questions, you can systematically eliminate or

include specific solutions and offerings. For example, by determining

that there are varying classes of data being transferred from the SAN

over the WAN, it may be discovered that QoS functionality is required

within your connecting equipment. Knowing the answers to the

above questions, as well as your application availability requirements,

places your IT team in the best possible position to narrow down

choices between solutions.

Issues with FC Core Bridging

The core of the FC fabric is built around high-end director class

switches, such as the QLogic SANbox 9200. This switch provides

solid and proven technology for sustaining storage area networks.

However, expanding the enterprise usually leads to multiple SAN

cores and a patchwork architecture. The investment in the SANbox

9200 should be leveraged for maximum utilization and sharing of SAN

resources. An ideal infrastructure would locate all core devices close

enough to bridge with standard, short-wave Fibre Channel products;

however, this is usually not possible. Although the issues may be

diverse, the solutions are straightforward.

Some of the specific issues include:

Long-distance bridging (>10km) of homogeneous cores – So

the IT department was lucky enough to maintain a single-vendor

policy for their FC fabric, but SAN islands have developed, causing

issues with policy management, utilization, and disaster recovery.

Bridging the islands is imperative to maintaining best practices.

Long-distance bridging (>10km) of heterogeneous cores

– The worst-case scenario is usually what hits us in real life, and

this situation is no different. Multiple SAN islands have evolved

within the organization, requiring that the SANbox 9200 bridge to

Brocade/McData or Cisco fabrics. Not only do we have to solve the

distance issue, but the compatibility issue as well.

•

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Bridging Topologies

To achieve higher levels of functionality and better management,

vendors usually define proprietary ports, such as E_port, F_Port,

G_port, and TE_port. Within those port types, vendors can have their

own unique classifications and requirements.

If you need to bridge SAN fabrics across vendors, you must often

sacrifice these proprietary features. This requires an intermediary

between one core and the other to allow communication and maintain

neutrality without merging the SANs.

The best way to bridge SANs without merging them, which forces

IT managers to abandon the advanced vendor features, is to use

routing based on N_ports. The N_port definition allows routers or

other SAN devices to log into a SAN as a native device. It doesn’t

cause compatibility issues with the core switches because it does not

merge the fabrics.

A long-distance bridge can be created between SANs with a router

using N_ports. Each core sees an attached native device, but no direct

view of the other switches. SAN management is simplified, without

merging the fabrics. The router can also use Ethernet ports to bridge

across the WAN to the remote SAN island.

The SANbox 6142 provides this type of routing capability. The QLogic

SANbox 6142 Intelligent Storage Router leverages N_ports for

simplified connection to the SANbox 9200 switch and gigabit Ethernet

ports for communication across the LAN or WAN. The basic topology

is shown below.

This network configuration allows SANbox 9200 switches in separate

locations to share data resources across the WAN, without having to

merge the SANs. See the section below on SmartWrite™ technology

for a full description of this technology and the benefits of Layer-3

routing.

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Using a combination of core and distribution switching, very cost-

effective strategies can be deployed across the extrastructure.

Distribution switches, such as the SANbox 5600, provide flexible and

expandable fabric services in locations with medium-duty data traffic.

Therefore, various combinations of the SANbox 9200, 5600, and 6142

can meet the changing needs of the corporation, without an over-

investment in SAN hardware. The basic concept for a multi-tiered

switching topology is shown below.

In this scenario, smaller data centers use distribution switches to

create the SAN fabric. The SANbox 5600 provides 10GB ISL backbone

ports for expansion, without sacrificing switch ports. Meanwhile, the

main data center utilizes the power and cost-efficiency of the core

chassis to handle the major switching needs of the enterprise. As

shown, each location is connected with the SANbox 6142, allowing

for data migration, replication, and disaster recovery, as discussed

further below.

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Furthermore, this type of routing can extend the SANbox 9200 beyond

QLogic-based networks. As described earlier, the gateway router

uses N_ports to connect into the SAN. Therefore, core switches from

other vendors can be bridged with the SANbox core. This can even

be expanded to multiple sites, each based on a different vendor, as

shown below.

Connecting each SAN island across the WAN with the SANbox 6142

removes core conflicts because router N_ports appear as just one

more native fabric device. Without merging the SANs, this network

configruation supports resource sharing and improves operational

efficiency. This also supports software management tools unique to

each SAN and enables global monitoring and policy enforcement.

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FCIP – Layer 2 Routing

The SANbox 6142 supports FCIP to provide maximum compatibility

with replication and WAN applications. However, FCIP has some

inherent limitations. The standard FCIP protocol uses many remote

procedure calls (RPCs) to move data across the network. When

they were designed, LAN environments existed within the same

building or campus. Its designers didn’t plan for efficiency over long

distances with multiple switching “hops.” RPCs communicate a lot

of commands and handshaking across the LAN/WAN; this creates an

overhead burden within the protocol known as “chattiness.”

For example, to move data across the WAN, the local server needs

to gain access to the remote target. Some operations require

roughly 75% of the RPCs for access, while the actual read and write

operations need only 10%. In a LAN environment, the latency of RPCs

is essentially unnoticed. However, across the WAN, each RPC can

have a latency of 50ms to 100ms (highly dependent on technology,

distance, and network settings). A data request that would take only

a few seconds within the LAN can turn into five to twenty minutes

across the WAN.

The figure below illustrates a basic example of transferring 64KB of

data across the WAN in packets of 32KB and a WAN latency of 50ms.

This latency exists regardless of the packet size; it is inherent in the

IP protocol. Once again, this is a simplified example. For clarity, this

example doesn’t show all of the handshaking. A typical file transfer

will have hundreds of command and status transfers.

The initiating system issues a write request to the remote system: 50ms delay

The remote system responds with a Ready status: 50ms delay

The initiating system sends the first block of 32KB data: 50ms delay

The remote system issues a transfer ready status: 50ms delay

The initiating system sends the second block of 32KB data: 50ms delay

The requesting system confirms that the transfer is complete: 50ms delay

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For example, transferring 64KB across the WAN would take over

300ms. Larger data blocks on the order of megabytes would consume

an unacceptable amount of time. This is a direct result of FCIP using

Layer 2 routing. In addition to the extra handshaking, Layer 2 routing

results in merging the SAN islands.

FCIP SAN Bridging – FCIP is a Layer 2 tunnel that relies on

proprietary E-ports to bridge SANs. Since this type of bridging

creates a tunnel between the two SANs, the SAN fabrics must be

the same on both ends; it also requires merging the SANs.

Layer 3 Router to Router Bridging – Layer 3 routing provides

a way to connect SANs that do not merge the fabrics and enable

IT managers to gain the benefits of SAN bridging and extension

without having to give up the value-added functionality of each

fabric vendor.

•

SmartWrite™ – Advanced Layer 3 Routing

SmartWrite™, unlike FCIP, is an intelligent, patent pending, routing

technology. It understands how to move the data from one point to

another while optimizing the transfer. It is the only intelligent SAN

over WAN protocol to leverage SCSI Layer 3 routing. This allows

SmartWrite to not only optimize transfers over the WAN, it simplifies

configuration and management.

SmartWrite:

Eliminates double addressing of SAN devices (IP and FC)

Eliminates the need to have unique names on each SAN

Eliminates 50% of the management overhead of FCIP

Leverages the WAN resources for resiliency and encryption

Reduces management overhead

Optimizes performance over the WAN

•

A SAN application issues a command to send an FC packet to an FC target over SmartWrite Layer 3 SCSI routing

SmartWrite intelligently determines:

The total wire transfers to reduce WAN latency

Compresses the data to improve WAN line speed

Leverages load balancing to minimize transfer time over multiple lines (if available)

SmartWrite converts the FC packet to an iSCSI packet and routes the data without merging the SAN fabrics

SmartWrite sends multiple transfers in one process, reducing WAN latency

SmartWrite delivers the FC packets to the target device

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First, SmartWrite can understand the total transfer size to go over

the WAN. This enables SmartWrite to tell the receiving router how

many transfers to expect over the WAN. For example, a source router

(located in New York) can tell the destination (located in London)

that it will receive only a write and how many transfers to expect

before completing the file. The SmartWrite protocol can send data

in a constant stream from the source to the destination without

having to wait for an individual acknowledgement for each write. This

dramatically reduces the transfer latency, which increases line usage

for data transfer and reduces WAN line costs.

Second, SmartWrite can compress the data before transferring it,

which reduces the volume of transferred data, as well as the number

of transfers required to move the data. In addition to reducing the data

transfer time, this lowers WAN costs.

Third, SmartWrite can load balance transfers over multiple WAN/LAN

lines to improve performance, lower total transfer time, and reduce

the number of transfers over the WAN.

All of these factors allow for a cost-efficient, high-speed, and easy-

to-manage core-to-core bridging strategy. The figure below shows

how SmartWrite’s performance optimization works in this New York

to London WAN example.

The total transfer time has been reduced to 100ms in this example.

As mentioned previously, real-world protocol handshaking requires

hundreds of transfers, each with its own latency, compounding the

total transfer time. By combining most of these commands locally and

then sending them, SmartWrite easily bridges remote core switches,

and the associated SAN island to the other resources.

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Core-to-Core Applications

With the creation of a bridged core-to-core topology, several

mission-critical functions can now be easily implemented across the

extrastructure. Across the globe, changes in regulatory requirements

from most governments place greater demands on businesses.

Although these regulations affect data that is often outside the data

center, the IT department still needs to protect, secure, and make

the data accessible globally. US regulations such as SEC 17a-

4, Sarbanes Oxley section 404, and HIPAA drive the need for new

storage strategies into every organization. This requires that those

servers provide data protection and management capabilities, often

associated with enterprise SANs, which are traditionally found only in

central IT departments. Each of the core-to-core applications outlined

below can be used to support sound data protection, regulatory

compliance policy and add flexibility to operational policies.

Data Migration

There are several reasons for migrating data from the SAN storage to

a remote array. In addition to regulatory compliance, the administrator

may want to safeguard the data with Continuous Data Protection

(CDP) or Snapshots. With either of these strategies, the metadata for

tracking changes should be kept on a different storage system, and

preferably in a different facility.

Incorporating the SANbox 6142 into the network allows quick and

seamless data transfer from the FC storage to the remote SAN.

Depending on the FC storage vendor and SAN management software

used, a server connected to the SAN may control the CDP or Snapshot

process instead of an in-fabric device.

Backup and Remote Replication

The most basic form of replication is data backup. Typically, the backup

system, either tape or VTL, is managed within the SAN. Since most of

the disk storage resides within the SAN, it makes the most sense to

co-locate the library on the same network as the data. A SAN backup

provides an advantage when many applications support “serverless

backup” within the SAN. The backup server initiates the backup job,

but the data flow is managed within the fabric, decreasing backup

times and server overhead. However, these benefits of SAN backup

can leave SAN islands separated from the most efficient backup

scenario. Bridging the other core switches into the primary SAN (or

the location where the backup resides) overcomes this problem.

Furthermore, replication allows the administrator to make a copy

of the dataset for various purposes such as archiving, disaster

recovery (discussed below), and application testing. For example,

the FC primary storage could have a live OLTP database. Let’s say

the marketing department wants to mine the database for customer

trends and demographics. Data mining on a live database risks data

integrity and reduces system performance. Specifically, the mining

slows down processing on the OLTP application (customer orders) to

where it’s nearly useless.

In cases like this, an administrator could move a copy of the database

to remote storage where the data mining application could run

independently. The replication could be scheduled for off-peak hours

and depending upon the size of the database, the duplicate database

could be available within a few hours to a couple of days. Many

scenarios such as this exist where a copy of live data or “aged” data

needs to move from the primary SAN storage onto other systems.

Two-site Disaster Recovery

Every organization has different needs and goals for data protection

and disaster recovery. When the RPO (Recovery Point Objective) and

RTO (Recovery Time Objective) are extremely small, such as a few

seconds to less than a minute, a two-site disaster recovery model

is the best solution. This scenario creates two data centers that are

functionally identical, although they may have some differences in the

underlying fabric and storage arrays. Both sites are live, synchronously

mirrored, and continuously provide data services to the company. This

almost instantly replicates every data write within a site on the other

site. The capacity, bandwidth, and functionality of both sites are large

enough to support the requirements of the entire organization, in the

event that one site should fail.

If a catastrophic event occurs at one location, the other location takes

over all SAN functions. While the mirror site is broken, the live site

logs any changes and transactions. When the failed site returns to full

operation, it re-establishes the mirror and synchronizes the data back

to normal operation.

As you can see, this scenario offers a very high degree of protection.

However, it also requires a large investment in infrastructure and

software. Bridging the mirrored sites with the SANbox 6142 can

reduce the cost for connectivity, software, and bandwidth.

Hot-site Disaster Recovery

When the RTO or RPO is not quite as severe as the example above,

the organization should consider the hot-site disaster recovery model.

This scenario is similar to the two-site model, but in this case the

second “hot-site” site operates in standby mode. Although it is online

and synchronized, the hot-site doesn’t support the normal operating

needs of the enterprise. When the primary site fails, the hot-site

handles all data transactions. Depending on the organization and

mission-criticality of the data, the hot-site might have less bandwidth

or storage capacity than the primary site. For example, users could

still access current data, but archived data may be off line.

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If the RPO is for a snapshot minutes or hours ago, the company

may consider using asynchronous replication to the hot-site. This

reduces the cost and complexity of the total solution, but still delivers

an acceptable level of protection. The basic question is, “How

much productivity can we afford to lose compared to the protection

costs?” For some companies, losing a few minutes of productivity or

information could be fatal, while others could tolerate recovering to a

point several hours or even days in the past.

Regardless of the RPO and synchronization scheme, once again the

SANbox 6142 bridges remote core switches over the WAN efficiently

and cost-effectively.

The SANbox products have been extensively tested with a large

variety of operating systems, storage arrays, and software. The

chart below shows some of the major applications for migration,

replication, and disaster recovery. Although the SANbox 6142 has

been tested with all of these applications, be sure to consult the

compatibility documents of each vendor for interoperability with the

specific combination of servers, operating systems, storage software,

data arrays, and network fabric before implementing a core-to-core

bridging strategy.

Company Software Product Migration Replication DR

EMC Powerpath

  

RepliStor

 

SRDF-A

  

Open Replicator

 

MirrorView

 

SAN Copy

  

Networker

 

HDS TrueCopy

 

HP Secure Path



Continuous Access (CA)

 

IBM RDAC (failover)



SAN Volume Controller (SVC)

  

Enhanced Remote Mirroring

 

Microsoft MPIO



Shadow Copy

 

NetApp SnapMirror

 

Red Hat Device Mapper MPIO



Sun MPXIO



SuSE Device Mapper MPIO



Veritas (Symantec) Volume Manager

 

NetBackup

 

Backup Exec

 

Volume Replicator

 

Replication Exec

 

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Summary and Conclusion

The enterprise environment continues to evolve and change.

Regardless of technology breakthroughs and system designs, SANs

continue to provide IT administrative challenges. By implementing a

cost-effective and robust core-to-core solution, system administrators

can reduce the management burdens and provide greater access to

network resources.

As we have seen, the SANbox 9200 core switch can leverage the

following benefits of the SANbox 6142 Intelligent Storage Router:

Intelligent Storage Routers are cost-effective versus director

based solutions.

Intelligent Storage Routers with advanced Layer 3 routing improve

performance without merging SANs.

Intelligent Storage Routers provide a flexible solutions that work

with all switches and directors in the data center, versus just a

single vendor.

•

Intelligent Storage Routers are heterogeneous via our N_port

technology and support all SAN Fabrics (Brocade, McDATA, Cisco

and QLogic).

Intelligent Storage Routers create the only true, open, core-to-core

connectivity to expand SANs across the extrastructure.

QLogic SANbox product family meets the current challenges of

bridging FC cores to remote data centers, storage arrays and servers.

While there is never a “one-size-fits-all” solution, especially within

computer networking, reasonable design practices in conjunction with

deploying the SANbox 6142 can minimize the burden of managing the

corporate extrastructure. Providing fast and error-free data to users is

the end-game of corporate computing. That goal can be achieved by

bridging SANs from core-to-core with the QLogic intelligent storage

router.

For more information on these solutions please contact us at:

http://www.qlogic.com/products/san_MultiProtocol.asp

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References

Websites of QLogic, Brocade, SNIA, IETF, IBM, Cisco

Trademarks

Brocade is a registered trademark of Brocade Corporation.

Cisco is a registered trademark of Cisco Systems

Powerpath, RepliStor, Open Replicator, MirrowView, SAN Copy, and

Networker are trademarks of EMC Corporation

TrueCopy is a trademark of Hitachi Data Systems

•

Secure Path and Continuous Access are trademarks of Hewlett-

Packard

SAN Volume Controller and Enhanced Remote Mirroring are

trademarks of IBM

Shadow Copy is a trademark of Microsoft Corporation

SnapMirror is a trademark of Network Appliance

NetBackup, Backup Exec, Volume Replicator, and Replication Exec

are trademarks of Symantec

SANbox is a registered trademark of QLogic Corporation.

SmartWrite is a trademark of QLogic Corporation.

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Disclaimer

Reasonable efforts have been made to ensure the validity and accuracy of these comparative performance tests. QLogic Corporation is not

liable for any error in this published white paper or the results thereof. Variation in results may be a result of change in configuration or in

the environment. QLogic specifically disclaims any warranty, expressed or implied, relating to the test results and their accuracy, analysis,

completeness or quality. All brand and product names are trademarks or registered trademarks of their respective companies.

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