Hitachi VSP F1500 User And Reference Manual page 220

2 You cannot register host groups in SPM groups in which WWNs (SPM
.
targets) are registered in step 3 of
performance when the host group is not registered in the SPM group on
page
You can register host groups described in limitation 1 above in SPM groups
that were not specified in step 3 of Table 5-3 if the WWNs that belong to the
host group meet the following requirements:
• The WWNs are not already registered as SPM targets using another port
number by performing step 1 of Table 5-3.
• The WWNs belong to SPM groups that were specified in step 3 of Table
5-4.
After registering a host group in an SPM group, Server Priority Manager sets
the SPM information as follows:
• When the SPM group is associated with the host group, Server Priority
Manager sets the same priority (prioritized or non-prioritized) as the SPM
group. Then, for the prioritized host group Server Priority Manager sets
the threshold, or for the non-prioritized host group Server Priority
Manager sets the upper limit of non-prioritized WWNs.
• When the SPM group is not associated with the host group, Server Priority
Manager sets the priority setting to prioritized without changing the
threshold.
For how to register host groups in SPM groups, see
server performance when the host group is registered in the SPM group (VSP
only) on page
Configuring Server Priority Manager by specifying LDEVs and WWNs
or iSCSI names of HBAs
To control the I/O priority for volumes in a storage system on the server, you
can configure Server Priority Manager by specifying an LDEV and a WWN or
iSCSI name of a host bus adapter.
For the combination of a volume (LDEV) and a host (WWN or iSCSI name),
specify the I/O priority (prioritized or non-prioritized). When the priority is
non-prioritized, set the upper limit value to control the server performance.
Set the prioritized priority to the host with higher priority, and the non-
prioritized priority to the host with lower priority. By adjusting the upper limit
value to an appropriate value, you can maintain the number of accesses and
the amount of data to be transferred from a prioritized host to a storage
system at a higher level.
The following table shows requirements for using Server Priority Manager by
specifying the LDEV, the WWN or iSCSI name of the host bus adapter.
Number of LDEVs that can be registered for each
storage system
5-66
5-59.
5-60.
Item
Provisioning operations with CCI
Command Control Interface User and Reference Guide
Table 5-4 Controlling server
Table 5-5 Controlling
Range
1
1 to 16,3841