HP StoreOnce 4430 HP StoreOnce Backup System Concepts and Configuration Guidel - Page 50

Fibre channel port presentations

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• In a dual fabric configuration ensure the equivalent FC ports from each B6200 node in a couplet are presented to the same fabric. However, they should present to separate switches within the fabric. See Scenario 3. • Ensure the D2D diagnostic device WWNs (these will be seen in the switch name server and are associated with the physical ports) are not included in any fabric zones and, therefore, not presented to any hosts. Fibre channel port presentations When you create a virtual tape library on a service set you specify whether the VTL should be presented to: • Port 1 and 2 • Port 3 and 4 • Port 1 • Port 2 • Port 3 • Port 4 Port 1 and 2 (or Port 3 and 4) is the recommended option to achieve efficient load balancing. Only the robotics (medium changer) part of the VTL is presented to Port 1 and Port 2 initially, with the number of virtual tape drives defined, being presented 50% to Port 1 and 50% to Port 2. This also ensures that in the event of a fabric failure at least half of the drives will still be available to the hosts. (The initial virtual tape drive allocation to ports (50/50) can be edited later, if required. So, to create a library you need: • 1 WWN for the robotics • XX number of WWNs for your drives, depending on the required number of drives Although the universal configuration rule is a maximum of 255 WWNs per port, the HP B6200 Backup System applies a maximum of 120 WWNs per port and up to 192 drives per library. This is to ensure fabric redundancy and to enable failover to work correctly. For example, should Port 1 fail in any of the selected configurations, the WWNs associated with its service set will not exceed 120 and can be failed over safely to Port 2. To summarize: • To create a library on one port only, the maximum number of devices that you can have is 120, of which 1 WWN is required for the robotics, so the total number of drives available = 119 drives • To create a library on Ports 1 and 2 (or Ports 3 and 4), the maximum number of drives is 96 per port (but this configuration is not recommended). This is a B6200 library limit and not a WWN limit. The following table illustrates various FC port configurations with VTL devices and the impact that the choice of FC ports has on the validity of the configuration. NOTE: This table will be updated to include Ports 3 and 4 in the next version of this guide. 50 Configuring FC to support failover in a StoreOnce B6200 Backup system environment

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•
In a dual fabric configuration ensure the equivalent FC ports from each B6200 node in a
couplet are presented to the same fabric. However, they should present to separate switches
within the fabric. See Scenario 3.
•
Ensure the D2D diagnostic device WWNs (these will be seen in the switch name server and
are associated with the physical ports) are not included in any fabric zones and, therefore,
not presented to any hosts.
Fibre channel port presentations
When you create a virtual tape library on a service set you specify whether the VTL should be
presented to:
•
Port 1 and 2
•
Port 3 and 4
•
Port 1
•
Port 2
•
Port 3
•
Port 4
Port 1 and 2 (or Port 3 and 4) is the recommended option to achieve efficient load balancing.
Only the robotics (medium changer) part of the VTL is presented to Port 1 and Port 2 initially, with
the number of virtual tape drives defined, being presented 50% to Port 1 and 50% to Port 2. This
also ensures that in the event of a fabric failure at least half of the drives will still be available to
the hosts. (The initial virtual tape drive allocation to ports (50/50) can be edited later, if required.
So, to create a library you need:
•
1 WWN for the robotics
•
XX number of WWNs for your drives, depending on the required number of drives
Although the universal configuration rule is a maximum of 255 WWNs per port, the HP B6200
Backup System applies a maximum of 120 WWNs per port and up to 192 drives per library. This
is to ensure fabric redundancy and to enable failover to work correctly. For example, should Port
1 fail in any of the selected configurations, the WWNs associated with its service set will not
exceed 120 and can be failed over safely to Port 2.
To summarize:
•
To create a library on one port only, the maximum number of devices that you can have is
120, of which 1 WWN is required for the robotics, so the total number of drives available
= 119 drives
•
To create a library on Ports 1 and 2 (or Ports 3 and 4), the maximum number of drives is 96
per port (but this configuration is not recommended). This is a B6200 library limit and not a
WWN limit.
The following table illustrates various FC port configurations with VTL devices and the impact that
the choice of FC ports has on the validity of the configuration.
NOTE:
This table will be updated to include Ports 3 and 4 in the next version of this guide.
50
Configuring FC to support failover in a StoreOnce B6200 Backup system environment