User's Manual

274 Protecting Your Virtual Disk with a Hot Spare
NOTE: For H700 and H800 controllers, you can assign a dedicated hot spare
to RAID 10, RAID 50, and RAID 60.
• Considerations for Multiple Dedicated Hot Spares —From Storage
Management version 3.1 onwards, Storage Management enables you to
assign more than one dedicated hot spare to a virtual disk.
NOTE: This feature is applicable only on PERC 5 and PERC 6 family of
controllers.
Physical Disk State, Alert Messages and Hot Spares on PERC 4/SC, 4/DC,
4e/DC, 4/Di, 4e/Si, and 4e/Di Controllers
If you have a hot spare assigned to a virtual disk and a physical disk in the
virtual disk fails, the failed physical disk may change from Online state to
Ready state without displaying a Failed state. This occurs when the hot spare
is activated before the physical disk is able to report the Failed state. Because
the Failed state is not reported, the “Device failed: physical disk” event 2048
is not generated.
When the hot spare is activated, the hot spare displays the Rebuilding state.
If you review the event log and identify a “rebuilding” event such as 2064 or
2065, you can assume that a physical disk has failed.
For information on Alert Messages, see the Dell OpenManage Server
Administrator Messages Reference Guide at support.dell.com/manuals.
Considerations for Hot Spares on CERC
SATA1.5/6ch, S100, and S300 Controllers
For the CERC SATA1.5/6ch, S100, and S300 controllers, a hot spare is
assigned to a virtual disk. When a physical disk fails, only the portion of the
physical disk containing the virtual disk is rebuilt onto the hot spare. Data or
space on the physical disk not included in the virtual disk are not rebuilt.
On the CERC SATA1.5/6ch, S100, and S300 controllers, individual physical
disks may be included in more than one virtual disk. (Assigning a portion of a
physical disk to a virtual disk does not preclude the remaining portion of the
physical disk from being used by other virtual disks.) Only the virtual disks to
which the hot spare is assigned are rebuilt. When using Storage Management,
a disk that is assigned as a hot spare on a CERC SATA1.5/6ch, S100, and
S300 controller cannot be used as a member of a virtual disk.