Determine the Automated QoS Priority from the following choices, according to the business conditions for the business application. The choices are described in order of highest priority.
Choices | Explanation |
|---|---|
Unlimited | This is set for volumes that do not restrict I/O performance. |
High | This is set for volumes where high I/O performance is required. |
Middle | High I/O performance is necessary, but if there are other volumes that are set with a "High" priority level and compete for I/O at the same time, this volume is set with a restricted I/O performance. |
Low | Other volumes are given priority and there are no problems setting this volume with a low I/O performance. If "Low" is selected, the Automated QoS function adjusts the other "High" priority volumes while considering the performance of the volumes that were selected with "Low". |
No Set | The I/O performance target setting is unnecessary and is set as a volume that can have restricted I/O performance in order to adjust the performance of the other volumes that share resources. If "No Set" is selected, the Automated QoS function adjusts the performance so that the performance targets of other volumes are achieved without considering the performance of the volumes that are selected with "No Set". |
Note
Note the following points related to the combination of volumes that are set with the Automated QoS Priority and target response time.
When the conditions for the precautionary items are satisfied, performance adjustments can be made.
When the Automated QoS Priority is set to "High", "Middle" or "Low", one or more volumes must be set with either of the following target values.
Set "High", "Middle", or "Low" for the Automated QoS Priority that is different from the volume that was set with the Automated QoS Priority.
Set the target response time to a number other than 0 milliseconds.
When there are two or more volumes that are set with a target value (Automated QoS Priority or target response time), I/O performance is adjusted even if the Automated QoS Priority is set with "Unlimited" or "No Set" or the target response time is set to 0 milliseconds for the other volumes.
From the business conditions for business applications A, B, C and D, whether or not to link the Automated QoS Priority and Automated Storage Tiering for each volume is determined.
The following table settings are explained in this example.
Tier Pool Name | FTV Name | Automated QoS Priority | Coordination with Automated Storage Tiering |
|---|---|---|---|
TrPool_1 | FTV#0 | High | On |
FTV#1 | Middle | Off | |
TrPool_2 | FTV#2 | No Set | Off |
FTV#3 | Low | Off |
The I/O performance for other volumes sharing these volumes and resources (Tier pool, CM, CA.CM port, and FC switch port) is controlled in accordance with the performance adjustment of volumes that are set with the Automated QoS Priority. In this example, since FTV#0 shares the Tier pool with FTV#1, the I/O performance is also controlled for FTV#1 depending on the settings of the Automated QoS function.
Point
When linking with Automated Storage Tiering is set to enable and I/O performance cannot be adjusted by the Automated QoS function alone, change the Automated Storage Tiering capacity allocation ratio, and adjust the I/O performance.
Example of the command executed in the Windows environment is shown below.
FTV#0 that exists in the Tier pool "TrPool_1" is set as the target for Automated QoS adjustments, Automated QoS Priority is set to "high", and linking with Automated Storage Tiering is enabled.
>$INS_DIR\Common\bin\esfadm volume qosset -ipaddr 192.0.2.10 -volume 0 -qosfunc enable -priority high -quotatune on
($INS_DIR is the "Program directory" when ETERNUS SF Manager has been installed.)
