Configuring an Array
Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache Enabler User Guide
7-21
COMPAQ CONFIDENTIAL
Writer: Amy L. Laffitte File Name: h-ch7 Configuring an Array
Codename: Executor Part Number: 266328-001 Last Saved On: 2/8/02 10:39 AM
Figure 7-17: Example array – Logical Configuration
View window, two arrays
NOTE:
The capacity shown for each logical drive is the free capacity available for data
storage. This value excludes the amount used for fault tolerance.
Expanding Array Capacity
Array capacity expansion is the addition of storage capacity to a pre-existing array.
The capacity of logical drives on the array does not change, and existing data is not
changed.
During capacity expansion, ACU automatically redistributes existing logical drives
across all of the physical drives in the expanded array. If the array being expanded
has more than one logical drive, data is redistributed one logical drive at a time.
Newly created logical drives are not available until capacity expansion has finished.
CAUTION:
Do not exchange the controller or array accelerator board during array
capacity expansion. Interrupting expansion in this way causes irretrievable data loss.
NOTE:
The expansion process takes about 15 minutes per gigabyte. A logical drive is
unavailable for any other process while it is undergoing an expansion, and no other logical
drive in the system can be expanded, extended, or migrated during this time.
There are three stages in the procedure for expanding an array:
