User's Manual

• For SAS/iR and PERC H200 family of controllers, you can assign only two global hot spares.
• If the status of the virtual disk is displayed as Degraded or Failed because of the hot spare protection
policy violation, then assign the required number of hot spares (as defined in the protection policies)
for the status to be displayed as normal.
• Hot Spare Protection Policy is not applicable to PERC S100, S110, and S300 controllers.
Considerations For Enclosure Affinity
• Enclosure affinity settings for dedicated hot spare are applicable only on PERC 5 and PERC 6 family of
controllers.
• Enclosure affinity settings for a global/dedicated hot spare are not automatically set when you
upgrade to version 6.1.
Enclosure affinity settings for a global/dedicated hot spare are not automatically set when you import a
foreign virtual disk.
Considerations For Hot Spares On PERC 5/E, PERC 5/i,
PERC 6/E, And PERC 6/I Controllers
On the PERC 5/E, PERC 5/i, PERC 6/E, and PERC 6/I controllers, assigning a hot spare is equivalent to
assigning a physical disk to replace another physical disk if it fails. If more than one redundant virtual disk
resides on the physical disk, then all redundant portions of the physical disk are rebuilt.
NOTE: When rebuilding a physical disk delete any non-redundant virtual disks (such as RAID 0) that
reside on the physical disk before rebuilding the physical disk.
When creating a virtual disk, the physical disks included in the virtual disk can vary in size. Ensure that the
hot spare must be the same size (or greater) as the smallest physical disk included in the virtual disk when
assigning a hot spare to a RAID 1 or 5 virtual disk.
When you use a PERC 5/E, PERC 5/i, PERC 6/E, and PERC 6/I controller, you can assign physical disks of
different sizes to a virtual disk. When a virtual disk is assigned to a physical disk, any portion of the
physical disk that is unused by the virtual disk becomes unusable. Therefore, the data on the unused
portion of the physical disk is not rebuilt. A redundant virtual disk is also either striped or mirrored in equal
portions across its member physical disks. The amount of data requiring a rebuild is therefore not greater
than the smallest physical disk.
A RAID 10 or 50 virtual disk may include spans that have physical disks of different sizes. In this case,
identify the span that has a low capacity physical disk. The hot spare should be large enough to rebuild
this physical disk. For example, if one span has three physical disks that are 60MB, 60MB and 40MB and
another span has physical disks that are 60MB, 60MB, and 50MB, then the hot spare must be 50MB or
larger.
A dedicated hot spare can only be assigned to the set of virtual disks that share the same physical disks. A
global hot spare is assigned to all redundant virtual disks on the controller. A global hot spare must be the
same size (or greater) as the smallest physical disk included in any virtual disk on the controller.
After you have assigned a global hot spare, any new virtual disks created on the controller are not
protected by the hot spare in either of the following circumstances:
• The controller is a SCSI controller and the partition size of the disk is larger than the global hot spare.
• The controller is a SAS controller and the disk size is larger than the global hot spare.
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