HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 104

Upgrading the Capacity of a Fully-Loaded Disk Array

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Concepts and Management Upgrading the Capacity of a Fully-Loaded Disk Array Upgrading the Capacity of a Fully-Loaded Disk Array It is easy to increase the capacity of your disk array, even if it is fully loaded with disk modules. By simply replacing the original disk modules with higher-capacity modules, you can add more logical drives or you can improve disk array performance by creating more unallocated capacity. Replacing the disk modules is done while the disk array is operating, thus avoiding any downtime. There are some important points to remember when replacing disk modules in a fully-loaded disk array. NOTE! Anytime a rebuild is in progress, the disk array is vulnerable to a disk failure. If another disk fails before the rebuild is complete, data loss will occur. Although this is unlikely to occur, it is something to consider before making the decision to increase the capacity of the disk array by replacing the disk modules. If another disk fails, you can minimize data loss by replacing the failed disk with the original disk removed to perform the upgrade. As added protection, it is a good idea to backup all your data before upgrading the capacity of the disk array. • The disk modules must be replaced one at a time, and the disk array must be allowed to rebuild the data from the disk module before a another disk module is removed. This ensures that no data is lost as a result of two disk modules being removed from the disk array simultaneously. Once the Rebuild is complete, the capacity of the new disk module is added to the disk array configuration and another disk module can then be replaced. • To make the additional capacity of the new disk modules available to the disk array, you must install at least two of the higher-capacity disk modules. The disk array cannot make full use of the added capacity if only one higher-capacity disk module is installed. • Because the Rebuild process can impact disk array performance, you may want to perform this operation during periods of low activity. This will minimize the impact on users who may be accessing the disk array. 104 Concepts

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Concepts and Management
Upgrading the Capacity of a Fully-Loaded Disk Array
104
Concepts
Upgrading the Capacity of a Fully-Loaded Disk Array
It is easy to increase the capacity of your disk array, even if it is fully loaded with disk modules. By simply
replacing the original disk modules with higher-capacity modules, you can add more logical drives or you
can improve disk array performance by creating more unallocated capacity. Replacing the disk modules is
done while the disk array is operating, thus avoiding any downtime.
There are some important points to remember when replacing disk modules in a fully-loaded disk array.
NOTE!
Anytime a rebuild is in progress, the disk array is vulnerable to a disk failure. If another
disk fails before the rebuild is complete, data loss will occur. Although this is unlikely to occur, it is
something to consider before making the decision to increase the capacity of the disk array by
replacing the disk modules. If another disk fails, you can minimize data loss by replacing the
failed disk with the original disk removed to perform the upgrade.
As added protection, it is a good idea to backup all your data before upgrading the capacity of the
disk array.
•
The disk modules must be replaced one at a time, and the disk array must be allowed to rebuild the
data from the disk module before a another disk module is removed. This ensures that no data is lost as
a result of two disk modules being removed from the disk array simultaneously. Once the Rebuild is
complete, the capacity of the new disk module is added to the disk array configuration and another disk
module can then be replaced.
•
To make the additional capacity of the new disk modules available to the disk array, you must install at
least two of the higher-capacity disk modules. The disk array cannot make full use of the added
capacity if only one higher-capacity disk module is installed.
•
Because the Rebuild process can impact disk array performance, you may want to perform this
operation during periods of low activity. This will minimize the impact on users who may be accessing
the disk array.