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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

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Changing the I/O type

You can specify the virtual disk I/O characteristics for the virtual disks that you are defining as part of the storage array configuration. The expected I/O characteristics of the virtual disk is used by the system to indicate an applicable default virtual disk segment size and dynamic cache read prefetch setting. .
NOTE: The dynamic cache read prefetch setting can be changed later by selecting Storage > Virtual Disk > Change > Cache Settings from the menu bar. You can change the segment size later by selecting Storage > Virtual Disk > Change > Segment Size from the menu bar.

The I/O characteristic types shown below are only presented during the create virtual disk process.

When you choose one of the virtual disk I/O characteristics, the corresponding dynamic cache prefetch setting and segment size that are typically well suited for expected I/O patterns are populated in the Dynamic cache read prefetch field and the Segment size field.

To change the I/O type:

  1. To enable read caching, select Enable read caching.
  2. To enable dynamic cache read prefetch, select Enable dynamic cache read prefetch.
  3. To enable write caching, select Enable write caching.
  4. Select one of the following:
    • Enable write caching with replication — Select this option to replicate cached data across two redundant RAID controller modules that have the same cache size.
    • Enable write caching without batteries — Select this option to permit write caching to continue even if the RAID controller module batteries are discharged completely, not fully charged, or are not present.
    NOTE:   Cache is automatically flushed if you disable Enable write caching.
  5. Click OK.
  6. In the confirmation dialog, click Yes.
    A progress dialog is displayed, which indicates the number of virtual disks being changed.
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