ETERNUS SF Storage Cruiser V16.0 Operation Guide for Optimization Function

5.3 Affected Range of Automatic Tuning

The volumes to which target values have been configured will be subject to automatic adjustments of their bandwidths in order for the targets to be reached. In the range of the shared resources, due to the effect of bandwidths being adjusted in order to increase the response time of the volumes to which target values have been configured, there are cases when the response time of volumes to which target values have not been configured decrease.

The shared resources of the volumes consist of the four following types.

• Tier pools

• CMs

• CA/CM ports

• Switch ports

The pattern of the shared resources of the volumes is explained based on configuration examples.

• Contention of Tier pools

  • Vol#1, Vol#2, Vol#3, and Vol#4 share Tier Pool#1 (a-1)

  • Vol#5 and Vol#6 share Tier Pool#2 (a-2)

  • Vol#7 and Vol#8 share Tier Pool#3 (a-3)

  • Vol#9 and Vol#10 share Tier Pool#4 (a-4)

• Contention of CMs

  • Vol#1, Vol#2, Vol#3, Vol#4, Vol#5, and Vol#6 share CM#0 (b-1)

• Contention of CA/CM ports

  • Vol#7, Vol#8, Vol#9, and Vol#10 share CM#1-CA#0-PORT#0 (c-1)

• Contention of Switch ports

  • Vol#5 and Vol#6 share PORT#2 of the Switch port on the storage side (d-1)

  • Vol#7, Vol#8, Vol#9, Vol#10, and Vol#A share PORT#4 of the Switch port on the server side (d-2)

Figure 5.3 Shared Resources of Volumes