HP P6000 Continuous Access Implementation Guide (T3680-96431, August 2012)

B-series switch configuration
The following routing policies are available on B-series switches:
• Exchange-based routing—The routing path is based on the SID, DID, and OXID optimizing
path utilization for the best performance. Each SCSI exchange can take a different path through
the fabric. Exchange-based routing requires using the Dynamic Load Sharing (DLS) feature.
When this policy is in effect, you cannot disable DLS. Exchange-based routing also supports
the following AP policies:
◦ AP shared link policy (default)
◦ AP dedicated link policy
This policy dedicates links to egress traffic and links to ingress traffic.
• Port-based routing—The routing path is based only on the incoming port and the destination
domain.
B-series switch settings for the HP-FC protocol
NOTE: The following configuration must be used in an HP P6000 Continuous Access environment
for all Fibre Channel switches in the path from the source array to the destination array. This
includes FCIP routers that are connected to the fabric.
Execute the following commands to establish the required switch settings:
1. switchdisable
2. aptpolicy 1 (enable port-based routing)
3. dlsreset (disable DLS)
4. iodset (enable in-order delivery)
5. switchenable
B-series switch settings for the HP SCSI-FCP protocol
NOTE: The HP SCSI-FCP protocol supports aptpolicy of 1 or 3, and iod enabled or disabled.
The best performance in a configuration with multiple paths between source and destination is
achieved using an aptpolicy of 3 and iod disabled (iodreset). Please review the Brocade
switch documentation for a detailed discussion of these settings.
Example: The following commands set the switch settings for best performance.
1. disable switch
2. aptpolicy 3 (enable exchange-based routing)
DLS is enabled when aptpolicy is set to 3.
3. aptpolicy –ap 0 (enable shared link policy)
4. iodreset (disable in-order delivery)
5. switchenable
C-series switch configuration
The following routing policies are available on C-series switches:
• Exchange based routing—The first frame in the exchange chooses a link, and subsequent
frames in the exchange use the same link. However, subsequent exchanges can use a different
link. This provides more granularity to load balancing while preserving the order of frames
for each exchange.
• Flow based routing—All frames between the source array and the destination array follow
the same links for a given flow. The link that is selected for the first exchange of the flow is
used for all subsequent exchanges.
52 Implementing remote replication