If you want to use an existing V-VOL as an S-VOL in an HTI clone pair and the V-VOL has capacity saving enabled and has assigned pages, use the following procedure to prepare the V-VOL.
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Perform LDEV formatting on the volume you want to use as the S-VOL.
If you create a pair without performing LDEV formatting, the initialization is performed during the copy operation, which might increase the required time for copying or might raise the processor operating rate.
- Set the capacity saving mode that you want to use on the S-VOL to the mode that satisfies your user requirements.
- Set the post-process mode if the user requirement is to suppress the impact on the I/O performance.
Using this mode, the S-VOL requires the pool capacity to be as large as the P-VOL because capacity saving is performed after the pair is created.
- Set the inline mode if the user requirement is to suppress the required pool capacity.
The required time for copying might be longer or the processor operating rate might be greater than that in the post-process mode. Consider applying the post-process mode to suppress the required time or processor operating rate.
If you use any of the following DKCMAIN firmware versions and create a pair without performing LDEV formatting, the post-process mode is applied even if you set the inline mode. Therefore, ensure that the pool capacity is as large as the P-VOL.
- VSP 5000 series: Earlier than 90-05-04-xx/xx
- VSP 5000 series: 90-06-01-xx/xx or later, earlier than 90-06-21-xx/xx
- VSP E series: Earlier than 93-04-02-xx/xx
- Set the post-process mode if the user requirement is to suppress the impact on the I/O performance.