Dell PowerVault ME5 Series Storage System CLI Reference Guide

This command acts on disks in a disk group but not dedicated spares for linear disk groups, or leftover disks. The command will:

• Check redundancy data (parity) and correct it for RAID 5, RAID 6, and ADAPT.
• Find, but not fix, mirror mismatches for RAID 1 and 10. The system reads both copies of mirror data to find any mismatches.
• Find and fix media errors for all RAID levels. Media errors occur when the system cannot read one of the copies of mirror data, due to a disk error such as an unrecoverable disk error (URE).

Disk-group scrub can last for multiple hours or longer, depending on disk-group size, utility priority, and amount of I/O activity. However, a manual scrub performed with this command is typically faster than a background scrub enabled with the set advanced-settings command. You can use a disk group while it is being scrubbed. To check the progress of a disk-group scrub (VRSC) job, use the show disk-groups command.

When a disk-group scrub job starts, event 206 is logged. When a scrub job ends, event 207 is logged and specifies whether errors were found and whether user action is required.

[fix yes|no]

<disk-groups>

[fix yes|no]

Optional. Specifies whether to automatically fix issues that are found. The default is yes.

• yes:
  • Finds and fixes media errors.
  • For RAID 5, RAID 6, and ADAPT: Finds and fixes parity mismatches by making parity match the data in all cases.
  • For RAID 1 and RAID 10: Finds and fixes mirror mismatches by copying data from one disk to the other.
• no:
  • For RAID 5 and RAID 6 (not ADAPT): Finds parity mismatches and media errors.
  • For RAID 1 and RAID 10: Finds parity mismatches, and finds and fixes media errors.

A comma-separated list of the names or serial numbers of the disk groups to scrub. A name that includes a space must be enclosed in double quotes.

# scrub disk-groups dg1

# scrub disk-groups dg1 fix no

abort scrub (with the disk-group parameter)

set advanced-settings

show disk-groups