FTVs only can be created in a Tier Pool.
Configuration of FTV is performed with the Web Console. This cannot be performed with the ETERNUS Web GUI.
The FTV usage rate is the proportion of each layer when the total physical capacity assigned to the FTV is expressed as 100. As values are displayed upon rounding of the second decimal place, there may be cases when the total does not add up to 100%.
Setting FTV Capacity Quota Share
You can set the quota share for the capacity of each sub-pool in the Tier pool when creating or making changes to FTV.
For FTV with a set quota share, relocation to each sub-pool is carried out according to the quota share.
For FTV for which a quota share has not been specified, relocation is carried out according to the Tiering policy specified in the Tier pool.
The relocation logic for the case when the FTV quota share has been specified is as follows:
For FTRPE that constitutes FTV, IOPS values are sorted in ascending order and relocation to the sub-pool performed so that the specified capacity quota share starts with the FTRP with high IOPS values. However, effects of relocation on sub-pool actual I/O are avoided by preparing a reserve domain that corresponds to 10% for each sub-pool. The size of the reserve domain is 10% of the size of the sub-pool (fixed).
If free space that corresponds to the quota share cannot be secured, relocation is performed with as much capacity as can be secured. Therefore, relocation may not proceed according to the specified quota share.
Figure 3.4 Relocation When Capacity Quota Share Is Specified For Each Layer
Figure 3.5 Relocation When Free Space Corresponding To Specification Of Capacity Quota Share Cannot Be Secured
Figure 3.6 Relocation When Capacity Quota Share Is Specified For Specific Layer
Note
Implement the changing / deletion / formatting of an FTV after updating the administration information of the FTV.
In order to update the administration information of an FTV, in relation to the ETERNUS Disk storage system of which the IP address thereof has been changed, perform the procedures listed under "Reload ETERNUS Disk Storage System Configuration Information" in the ETERNUS SF Web Console Guide.
