HP StoreOnce 4430 HP StoreOnce Backup System Concepts and Configuration Guidel - Page 45

Use soft zoning for high availability, VTL Fibre Channel resiliency using WWN zoning

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Zoning may not always be required for configurations that are already small or simple. Typically the larger the SAN, the more zoning is needed. Use the following guidelines to determine how and when to use zoning. • Small fabric (16 ports or less)-may not need zoning • Small to medium fabric (16 - 128 ports)-use host-centric zoning. Host-centric zoning is implemented by creating a specific zone for each server or host, and adding only those storage elements to be utilized by that host. Host-centric zoning prevents a server from detecting any other devices on the SAN or including other servers, and it simplifies the device discovery process. • Disk and tape on the same pair of HBAs is supported along with the coexistence of array multipath software (no multipath to tape or library devices on the HP StoreOnce Backup system, but coexistence of the multipath software and tape devices). • Large fabric (128 ports or more)-use host-centric zoning and split disk and tape targets. Splitting disk and tape targets into separate zones will help to keep the HP StoreOnce Backup system free from discovering disk controllers that it does not need. For optimal performance, where practical, dedicate HBAs for disk and tape. Use soft zoning for high availability The StoreOnce appliance allows the robot and tape drives to be presented to the different FC ports that are connected to the customer's fabric. The diagram below shows a way of utilizing this feature to add higher availability to your StoreOnce VTL deployment. When the VTL is created there is the option to present the device to Port1, Port2 or Port 1&2. If the customer chooses to present the VTL to Port 1 &2, the following happens. The robot is presented to both Port1 and Port2, 50% of the configured drives are presented to Port1 and the other 50% to Port2 (this can be changed if required). With this configuration in the event of a Fabric Failure - the robot and 50% of the drives are available for backup. The downside to this feature is that only a single 8Gb FC link is available for backups. Figure 23 VTL Fibre Channel resiliency using WWN zoning General Fibre Channel configuration guidelines 45

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Zoning may not always be required for configurations that are already small or simple. Typically
the larger the SAN, the more zoning is needed. Use the following guidelines to determine how
and when to use zoning.
•
Small fabric (16 ports or less)—may not need zoning
•
Small to medium fabric (16 - 128 ports)—use host-centric zoning. Host-centric zoning is
implemented by creating a specific zone for each server or host, and adding only those storage
elements to be utilized by that host. Host-centric zoning prevents a server from detecting any
other devices on the SAN or including other servers, and it simplifies the device discovery
process.
•
Disk and tape on the same pair of HBAs is supported along with the coexistence of array
multipath software (no multipath to tape or library devices on the HP StoreOnce Backup system,
but coexistence of the multipath software and tape devices).
•
Large fabric (128 ports or more)—use host-centric zoning and split disk and tape targets.
Splitting disk and tape targets into separate zones will help to keep the HP StoreOnce Backup
system free from discovering disk controllers that it does not need. For optimal performance,
where practical, dedicate HBAs for disk and tape.
Use soft zoning for high availability
The StoreOnce appliance allows the robot and tape drives to be presented to the different FC ports
that are connected to the customer’s fabric. The diagram below shows a way of utilizing this feature
to add higher availability to your StoreOnce VTL deployment. When the VTL is created there is the
option to present the device to Port1, Port2 or Port 1&2. If the customer chooses to present the VTL
to Port 1 &2, the following happens. The robot is presented to both Port1 and Port2, 50% of the
configured drives are presented to Port1 and the other 50% to Port2 (this can be changed if
required). With this configuration in the event of a Fabric Failure – the robot and 50% of the drives
are available for backup. The downside to this feature is that only a single 8Gb FC link is available
for backups.
Figure 23 VTL Fibre Channel resiliency using WWN zoning
General Fibre Channel configuration guidelines
45