HP StorageWorks P2000 G3 MSA System SMU Reference Guide 53
Configuring system utilities
Configuring background scrub for vdisks
You can enable or disable whether the system continuously analyzes disks in vdisks to detect, report, and
store information about disk defects. Vdisk-level errors reported include: hard errors, media errors, and bad
block replacements (BBRs). Disk-level errors reported include: metadata read errors, SMART events during
scrub, bad blocks during scrub, and new disk defects during scrub. For RAID 3, 5, 6, and 50, the utility
checks all parity blocks to find data-parity mismatches. For RAID 1 and 10, the utility compares the
primary and secondary disks to find data inconsistencies. For NRAID and RAID 0, the utility checks for
media errors.
You can use a vdisk while it is being scrubbed. Background vdisk scrub runs at background utility priority,
which reduces to no activity if CPU usage is above a certain percentage or if I/O is occurring on the vdisk
being scrubbed. A vdisk scrub may be in process on multiple vdisks at once. A new vdisk will first be
scrubbed 20 minutes after creation. After a vdisk is scrubbed, scrub will start again after the interval
specified by the Vdisk Scrub Interval option.
When a scrub is complete, an event with code 207 is logged that specifies whether errors were found. For
details, see the Event Descriptions Reference Guide.
Enabling background vdisk scrub is recommended for both SATA and SAS disks.
TIP: If you choose to disable background vdisk scrub, you can still scrub a selected vdisk by using Media
Scrub Vdisk (page 85).
To configure background scrub for vdisks
1. In the Configuration View panel, right-click the system and select Configuration > Advanced Settings >
System Utilities.
2. Set the options:
• Either select (enable) or clear (disable) the Vdisk Scrub option. This option is enabled by default.
• Set the Vdisk Scrub Interval, which is the interval between background vdisk scrub finishing and
starting again, from 1–360 hours; the default is 24 hours.
3. Click Apply.
Configuring background scrub for disks not in vdisks
You can enable or disable whether the system continuously analyzes disks that are not in vdisks to detect,
report, and store information about disk defects. Errors reported include: metadata read errors, SMART
events during scrub, bad blocks during scrub, and new disk defects during scrub. The interval between
background disk scrub finishing and starting again is 24 hours.
Enabling background vdisk scrub is recommended for both SATA and SAS disks.
To configure background scrub for vdisks
1. In the Configuration View panel, right-click the system and select Configuration > Advanced Settings >
System Utilities.
2. Either select (enable) or clear (disable) the Disk Scrub option. This option is disabled by default.
3. Click Apply.
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