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

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Changing the pre-read consistency check setting of an overall repository virtual disk

Use the Pre-Read Consistency Check option to define a storage array's capability to pre-read an overall repository virtual disk consistency information and determine whether the data of that overall repository virtual disk is consistent. An overall repository virtual disk that has this feature enabled returns read errors if the data is determined to be inconsistent by the RAID controller module firmware. You can enable this option for overall repository virtual disks that contain consistency information. RAID Level 1, RAID Level 5, and RAID Level 6 maintain consistency information.

You can enable this option for overall repository virtual disks that contain consistency information. RAID Level 1, RAID Level 5, and RAID Level 6 maintain consistency information.
You can change the Pre-Read Consistency Check for an overall repository for the following storage objects:
  • Snapshot group
  • Snapshot virtual disk
  • Consistency group member virtual disk
  • Replicated Pair
The following guidelines apply:
  • Changing the Pre-Read Consistency Check setting modifies the setting only for the overall repository that you selected.
  • The Pre-Read Consistency Check setting is applied to all individual repository virtual disks contained within the overall repository.
  • If an overall repository virtual disk that is configured with pre-read is migrated to a RAID level that does not maintain consistency information, the metadata of the overall repository virtual disk continues to show that pre-read is enabled. However, reads to that overall repository virtual disk ignores consistency pre-read. If the virtual disk is subsequently migrated back to a RAID level that supports consistency, the option becomes available again.
To create a consistency group snapshot virtual disk:
  1. From the AMW, select the Storage & Copy Services tab.
  2. Select the storage object for which to change the pre-read consistency check settings.
  3. Right click the select object and select Overall Repository > Change Pre-read Consistency Check.
  4. Select Enable pre-read consistency check, and click OK.
    NOTE: Enabling the option on overall repository virtual disks without consistency does not affect the virtual disk. However, the attribute is retained for that overall repository virtual disk if it is ever changed to one with consistency information.
  5. Click Yes.
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