HP Surestore Disk Array 12h System Administrator's Guide for HP-UX, MPE, and W - Page 136

Adding a Disk, Using the ARM Command Line Utilities for MPE, Increase capacity, Improve performance

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MPE Using the ARM Command Line Utilities for MPE Adding a Disk Adding a Disk At some time, you may want to add another disk to your array. Features such as hot-pluggable disks and Auto Include simplify the process of adding a disk to the array even while it is operating. A disk can be added to the array without disrupting current I/O operations. After you have added a new disk, you have three options on how to use it: • Increase capacity - use the disk to increase the capacity available to the operating system by creating a new LUN. • Improve performance - use the disk to improve the disk array performance by simply leaving it as unallocated capacity. • Enable Active Spare - use the additional capacity to enable Active Hot Spare if the disk array does not currently have the capacity to support this feature. This also improves performance as the spare space is used as RAID 0/1 space until it is needed. To add a disk to the array: 4. Make sure the new disk has been physically inserted into the array. 5. If Auto Include is on, the disk is automatically added to the array and you can skip to the next step. If Auto Include is off, manually include the disk as described in the next section, "Including a Disk." NOTE! In some situations, the array will not include a disk automatically, even if Auto Include is enabled. This will occur if the new disk's status is something other than Normal. See "Auto Include" in the HP SureStore E Disk Array 12H User's and Service Manual for more information about when this might occur. 6. Depending on how you intend to use the new disk, perform the appropriate next step: • To use the disk to increase capacity, create a LUN using all or a portion of the disk capacity. For more information, see "Creating a LUN" in this chapter. • To use the disk to increase performance, leave the disk capacity unallocated. • To use the disk capacity for an Active Hot Spare, enable the Active Hot Spare feature if not currently enabled. For more information, see "Changing Disk Array Configuration Settings" in this chapter. Including a Disk A disk must be included in the disk array configuration before it can be used by the disk array. There are two ways to include a disk: 136

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Using the ARM Command Line Utilities for MPE
Adding a Disk
136
MPE
Adding a Disk
At some time, you may want to add another disk to your array. Features such as hot-pluggable disks and
Auto Include simplify the process of adding a disk to the array even while it is operating. A disk can be
added to the array without disrupting current I/O operations.
After you have added a new disk, you have three options on how to use it:
•
Increase capacity
- use the disk to increase the capacity available to the operating system by creating a
new LUN.
•
Improve performance
- use the disk to improve the disk array performance by simply leaving it as
unallocated capacity.
•
Enable Active Spare
- use the additional capacity to enable Active Hot Spare if the disk array does not
currently have the capacity to support this feature. This also improves performance as the spare space is
used as RAID 0/1 space until it is needed.
To add a disk to the array:
4.
Make sure the new disk has been physically inserted into the array.
5.
If Auto Include is on, the disk is automatically added to the array and you can skip to the next step. If
Auto Include is off, manually include the disk as described in the next section, “
Including a Disk
.”
NOTE!
In some situations, the array will not include a disk automatically, even if Auto Include is
enabled. This will occur if the new disk’s status is something other than Normal. See “Auto
Include” in the
HP SureStore E Disk Array 12H User’s and Service Manual
for more information
about when this might occur.
6.
Depending on how you intend to use the new disk, perform the appropriate next step:
•
To use the disk to increase capacity, create a LUN using all or a portion of the disk capacity. For
more information, see “
Creating a LUN
” in this chapter.
•
To use the disk to increase performance, leave the disk capacity unallocated.
•
To use the disk capacity for an Active Hot Spare, enable the Active Hot Spare feature if not
currently enabled. For more information, see “
Changing Disk Array Configuration Settings
” in this
chapter.
Including a Disk
A disk must be included in the disk array configuration before it can be used by the disk array. There are
two ways to include a disk: