The volumes that have been configured with target values are subject to automatic bandwidth adjustments in order to reach the target. For the range of shared resources, due to the effects of the bandwidth adjustments, in order to speed up the response times in the volumes that are set with the target value, the response times for volumes that are not set with the target value may be slower. Volumes that are not set with the target value refers to volumes that satisfies the following conditions:
Volumes that are the subject of Automated QoS adjustment (set to "Enable")
Volumes that are set to "No Set" (no priority level setting) for Automated QoS Priority and the target response time is not set
The following resource-sharing volumes are influenced by the performance adjustments of volumes that are set with a target value.
Shared Resources | Explanation of Sharing |
|---|---|
Tier pools | Exists in the same Tier pool |
CM | The same CM is used with the host affinity settings |
CA/CM ports | The same CA/CM port is used with the host affinity settings |
Switch port | The same switch port is used with the host affinity settings |
However, the resource that is affected differs depending on the type of connection with the host.
Resource Name | Type of Connection With Host | ||
|---|---|---|---|
FC Connection | FCoE Connection | iSCSI Connection | |
Tier pools | A | A | A |
CM | A | A | A |
CA/CM ports | A | A | N/A |
Switch port | A | A | N/A |
A: Affected resources
N/A: Unaffected resources
The description about the shared resources on the volume based on the configuration example in "Figure 5.3 Example of Resources Shared with Volume" is as follows:
When multiple volumes within a single Tier pool are allocated in a server and different businesses use the respective volumes at the same time, the load is concentrated within that Tier pool and may affect the volumes existing in that Tier pool.
"Figure 5.3 Example of Resources Shared with Volume" refers to the following volumes.
Vol#1,Vol#2,Vol#3,and Vol#4 (a-1) sharing Tier pool#1
Vol#5 and Vol#6 (a-2) sharing Tier pool#2
Vol#7 and Vol#8 (a-3) sharing Tier pool#3
Vol#9 and Vol#10 (a-4) sharing Tier pool#4
The volumes in "Figure 5.3 Example of Resources Shared with Volume" that are affected by sharing the CM are as follows:
Vol#1, Vol#2, Vol#3, Vol#4, Vol#5, and Vol#6 (b-1) sharing CM#0
The volumes in "Figure 5.3 Example of Resources Shared with Volume" that are affected by sharing the CA/CM ports are as follows:
Vol#7, Vol#8, Vol#9, and Vol#10 (c-1) sharing M#1-CA#0-PORT#0
The volumes in "Figure 5.3 Example of Resources Shared with Volume" that are affected by sharing the switch port are as follows:
Vol#5 and Vol#6 (d-1) sharing the storage side switch Port PORT#2 (d-1)
Vol#7, Vol#8, Vol#9, Vol#10, and Vol#A (d-2) sharing the Server-side switch port PORT#4
Figure 5.3 Example of Resources Shared with Volume
