HP ProLiant DL288 Configuring Arrays on HP Smart Array Controllers Reference G - Page 66

Expanding an array, Shrinking an array

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Expanding an array You can increase the storage space on an array by adding physical drives. Any drive that you want to add must meet the following criteria: • It must be an unassigned drive. • It must be of the same type as existing drives in the array (for example, SATA or SAS). • It must have a capacity no less than that of the smallest drive in the array. IMPORTANT: An array expansion, logical drive extension, or logical drive migration takes about 15 minutes per gigabyte. While this process is occurring, no other expansion, extension, or migration can occur simultaneously on the same controller. Controllers that do not support a battery-backed write cache do not support this process. Syntax: add drives allunassigned [forced] where is an array (or a logical drive, if the array contains only one logical drive). The forced parameter represses any warning message prompts. If you specify a drive range, any drives in the range that do not meet the previous criteria are not used. If you add an odd number of drives to an array that contains a RAID 1+0 logical drive, you are prompted to convert the RAID 1+0 logical drive to RAID 5 or RAID 6 (ADG). Adding the forced parameter to the command prevents this prompt from appearing. Example commands: => ctrl slot=3 array A add drives=1:0,1:1 => ctrl slot=4 ld 1 add drives=allunassigned => ctrl slot=5 array A add drives=1:1-1:5 Shrinking an array Some controllers may not support this option or may require a license key to enable this feature. You can shrink the size of an array by removing a drive from an existing array. Observe the following criteria: • After the shrink, the array must have sufficient capacity to contain all of the configured logical volumes. • You may not remove drives from the array if the resulting number of drives does not support the fault tolerance (RAID level) of any existing logical drive. For example, if you have an array with four physical drives and a RAID 5 logical drive, you can remove, at most, one drive, because RAID 5 requires at least three physical drives. • If the array contains a RAID 1+0 logical drive, you can remove only an even number of drives. • If the array contains a compound RAID (RAID 50 or RAID 60) logical drive, you can remove drives only in multiples of the number of parity groups. For example, an array with 10 physical drives and a RAID 50 logical drive can be shrunk by removing two or four drives only. Syntax: remove drives where is an array, and the specified physical drives are being removed to shrink the array. HP Array Configuration Utility 66

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HP Array Configuration Utility
66
Expanding an array
You can increase the storage space on an array by adding physical drives. Any drive that you want to
add must meet the following criteria:
•
It must be an unassigned drive.
•
It must be of the same type as existing drives in the array (for example, SATA or SAS).
•
It must have a capacity no less than that of the smallest drive in the array.
IMPORTANT:
An array expansion, logical drive extension, or logical drive migration takes
about 15 minutes per gigabyte. While this process is occurring, no other expansion,
extension, or migration can occur simultaneously on the same controller. Controllers that do
not support a battery-backed write cache do not support this process.
Syntax:
<target> add drives=[#:]#:#,[#:]#:#,[#:]#:#–[#:]#:#,...|allunassigned
[forced]
where
<target>
is an array (or a logical drive, if the array contains only one logical drive). The
forced
parameter represses any warning message prompts. If you specify a drive range, any drives in
the range that do not meet the previous criteria are not used.
If you add an odd number of drives to an array that contains a RAID 1+0 logical drive, you are prompted
to convert the RAID 1+0 logical drive to RAID 5 or RAID 6 (ADG). Adding the
forced
parameter to the
command prevents this prompt from appearing.
Example commands:
=> ctrl slot=3 array A add drives=1:0,1:1
=> ctrl slot=4 ld 1 add drives=allunassigned
=> ctrl slot=5 array A add drives=1:1–1:5
Shrinking an array
Some controllers may not support this option or may require a license key to enable this feature.
You can shrink the size of an array by removing a drive from an existing array. Observe the following
criteria:
•
After the shrink, the array must have sufficient capacity to contain all of the configured logical
volumes.
•
You may not remove drives from the array if the resulting number of drives does not support the fault
tolerance (RAID level) of any existing logical drive. For example, if you have an array with four
physical drives and a RAID 5 logical drive, you can remove, at most, one drive, because RAID 5
requires at least three physical drives.
•
If the array contains a RAID 1+0 logical drive, you can remove only an even number of drives.
•
If the array contains a compound RAID (RAID 50 or RAID 60) logical drive, you can remove drives
only in multiples of the number of parity groups. For example, an array with 10 physical drives and
a RAID 50 logical drive can be shrunk by removing two or four drives only.
Syntax:
<target> remove drives=[#:]#:#-[#:]#:#
where
<target>
is an array, and the specified physical drives are being removed to shrink the array.