Dell PowerVault MD3260 Administrator's Guide - Page 73

Hot Spares And Rebuild, Global Hot Spares, Hot Spare Operation, Hot Spare Coverage

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- Automatically assign physical disks - to create hot spare physical disks automatically for the best hot spare coverage using available physical disks. - Manually assign individual physical disks - to create hot spare physical disks out of the selected physical disks on the Hardware tab. - Manually unassign individual physical disks - to unassign the selected hot spare physical disks on the Hardware tab. See step 12. NOTE: This option is available only if you select a hot spare physical disk that is already assigned. 5. To assign hot spares, in the Hot Spare Coverage window, select a disk group in the Hot spare coverage area. 6. Review the information about the hot spare coverage in the Details area. 7. Click Assign. The Assign Hot Spare window is displayed. 8. Select the relevant Physical disks in the Unassigned physical disks area, as hot spares for the selected disk and click OK. 9. To unassign hot spares, in the Hot Spare Coverage window, select physical disks in the Hot spare physical disks area. 10. Review the information about the hot spare coverage in the Details area. 11. Click Unassign. A message prompts you to confirm the operation. 12. Type yes and click OK. Hot Spares And Rebuild A valuable strategy to protect data is to assign available physical disks in the storage array as hot spares. A hot spare adds another level of fault tolerance to the storage array. A hot spare is an idle, powered-on, stand-by physical disk ready for immediate use in case of disk failure. If a hot spare is defined in an enclosure in which a redundant virtual disk experiences a physical disk failure, a rebuild of the degraded virtual disk is automatically initiated by the RAID controller modules. If no hot spares are defined, the rebuild process is initiated by the RAID controller modules when a replacement physical disk is inserted into the storage array. Global Hot Spares The MD Series Dense storage arrays support global hot spares. A global hot spare can replace a failed physical disk in any virtual disk with a redundant RAID level as long as the capacity of the hot spare is equal to or larger than the size of the configured capacity on the physical disk it replaces, including its metadata. Hot Spare Operation When a physical disk fails, the virtual disk automatically rebuilds using an available hot spare. When a replacement physical disk is installed, data from the hot spare is copied back to the replacement physical disk. This function is called copy back. By default, the RAID controller module automatically configures the number and type of hot spares based on the number and capacity of physical disks in your system. A hot spare may have the following states: • A standby hot spare is a physical disk that has been assigned as a hot spare and is available to take over for any failed physical disk. • An in-use hot spare is a physical disk that has been assigned as a hot spare and is currently replacing a failed physical disk. 73

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–
Automatically assign physical disks
— to create hot spare physical disks automatically for the best hot
spare coverage using available physical disks.
–
Manually assign individual physical disks
— to create hot spare physical disks out of the selected physical
disks on the
Hardware
tab.
–
Manually unassign individual physical disks
— to unassign the selected hot spare physical disks on the
Hardware
tab. See step 12.
NOTE:
This option is available only if you select a hot spare physical disk that is already assigned.
5.
To assign hot spares, in the
Hot Spare Coverage
window, select a disk group in the
Hot spare coverage
area.
6.
Review the information about the hot spare coverage in the
Details
area.
7.
Click
Assign
.
The
Assign Hot Spare
window is displayed.
8.
Select the relevant Physical disks in the
Unassigned physical disks
area, as hot spares for the selected disk and
click
OK
.
9.
To unassign hot spares, in the
Hot Spare Coverage
window, select physical disks in the
Hot spare physical disks
area.
10.
Review the information about the hot spare coverage in the
Details
area.
11.
Click
Unassign
.
A message prompts you to confirm the operation.
12.
Type
yes
and click
OK
.
Hot Spares And Rebuild
A valuable strategy to protect data is to assign available physical disks in the storage array as hot spares. A hot spare
adds another level of fault tolerance to the storage array.
A hot spare is an idle, powered-on, stand-by physical disk ready for immediate use in case of disk failure. If a hot spare
is defined in an enclosure in which a redundant virtual disk experiences a physical disk failure, a rebuild of the degraded
virtual disk is automatically initiated by the RAID controller modules. If no hot spares are defined, the rebuild process is
initiated by the RAID controller modules when a replacement physical disk is inserted into the storage array.
Global Hot Spares
The MD Series Dense storage arrays support global hot spares. A global hot spare can replace a failed physical disk in
any virtual disk with a redundant RAID level as long as the capacity of the hot spare is equal to or larger than the size of
the configured capacity on the physical disk it replaces, including its metadata.
Hot Spare Operation
When a physical disk fails, the virtual disk automatically rebuilds using an available hot spare. When a replacement
physical disk is installed, data from the hot spare is copied back to the replacement physical disk. This function is called
copy back. By default, the RAID controller module automatically configures the number and type of hot spares based on
the number and capacity of physical disks in your system.
A hot spare may have the following states:
•
A standby hot spare is a physical disk that has been assigned as a hot spare and is available to take over for any
failed physical disk.
•
An in-use hot spare is a physical disk that has been assigned as a hot spare and is currently replacing a failed
physical disk.
73