User Guide

Table 8. Physical Disk Actions

Action Description

Rebuild Regenerates all data to a replacement disk in a redundant virtual disk (RAID level

1, 5, 6, 10, 50, or 60) after a disk failure. A disk rebuild normally occurs without

interrupting normal operations on the affected virtual disk.

Replace Member Replaces the disk in the virtual disk with another disk that can be selected.

LED Blinking Indicates when physical disks are being used to create a virtual disk. You can

choose to start or stop the LED blinking.

Force Online Changes the state of the selected physical disk to online.

Force Offline Changes the state of the selected physical disk so that it is no longer part of a

virtual disk.

Make Global HS

Designates the selected physical disk as a global hot spare. A global hot spare is

part of a pool for all virtual disks controlled by the controller.

Remove HS Removes a dedicated hot spare from its disk group or a global hot spare from

the global pool of hot spares.

Rebuild

Select Rebuild to rebuild one or more failed physical disks. For information on performing a physical disk

rebuild, see the topic Performing A Manual Rebuild Of An Individual Physical Disk.

Several of the controller configuration settings and the virtual disk settings affect the actual rate of

rebuild. The factors include the rebuild rate setting, virtual disk stripe size, virtual disk read policy, virtual

disk write policy, and the amount of workload placed on the storage subsystem. For information on

getting the best rebuild performance from your RAID controller, see the documentation at dell.com/

support/manuals.

The listed rates in the following table were taken during single disk failure with no I/O present on a PERC

H810 card connected to a single PowerVault MD1220 enclosure. Rates vary depending on type, speed

and number of hard drives present in array; as well as which controller model and enclosure

configuration are being used.

Table 9. Estimated Rebuild Rates

RAID Level Number of Hard Drives 7.2K RPM 6 Gb/s  SAS Hard

Drive

15K RPM 6 Gb/s  SAS

Hard Drive

RAID 1 2 320 GB/hour 500 GB/hour

RAID 5 6 310 GB/hour 480 GB/hour

RAID 10 6 320 GB/hour 500 GB/hour

RAID 5 24 160 GB/hour 240 GB/hour

RAID 10 24 380 GB/hour 500 GB/hour