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

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Checking data consistency

Use the Check Consistency option to check the consistency on a selected disk pool or disk group.

Use this option only when instructed by the Recovery Guru.
CAUTION: Use this option only under the guidance of your Technical Support representative.
Keep these important guidelines in mind before you check data consistency:
  • Disk pools are configured only as RAID Level 6.
  • You cannot use this option on RAID Level 0 disk groups that have no consistency.
  • If you use this option on a RAID Level 1 disk group, the consistency check compares the data on the replicated physical disks.
  • If you perform this operation on a RAID Level 5 or RAID Level 6 disk group, the check inspects the consistency information that is striped across the physical disks. The information about RAID Level 6 applies also to disk pools.
  • To successfully perform this operation, these conditions must be present:
    • The virtual disks in the disk pool or disk group must be in Optimal status.
    • The disk pool or disk group must have no virtual disk modification operations in progress.
    • You can perform this operation only on one disk pool or disk group at a time. However, you can perform a consistency check on selected virtual disks during a media scan operation. You can enable a media scan consistency check on one or more virtual disks in the storage array.
To check data consistency:
  1. Select the Storage & Copy Services tab.
  2. Select the disk pool or disk group that you want to check.
  3. Select one of the following from the menu bar:
    • Storage > Disk Group > Advanced > Check Consistency
    • Storage > Disk Pool > Advanced > Check Consistency
  4. Click Yes.
  5. Click Start.
    The check consistency operation starts and the Check Consistency dialog is displayed. The virtual disks in the disk pool or disk group are sequentially scanned, starting from the top of the table in the virtual disk dialog. The following actions occur as each virtual disk is scanned:
    • The virtual disk is selected in the virtual disk table.
      CAUTION: Possible loss of data access – A consistency error is potentially serious and could cause a permanent loss of data.
    • The status of the consistency check is shown in the Associated Status column.
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