Compaq 3200 - Manual (Page 25)

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Compaq Smart Array 3200 Controller Reference Guide
Writer: Rickard Project: Compaq Smart Array 3200 Controller Reference Guide Comments: 340862-002
File Name: C-CH02.DOC Last Saved On: 12/7/98 8:33 AM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Changing the Fault Tolerance (RAID
Level) of an Array
General steps for changing the Fault Tolerance (RAID Level) of an array
include:
1. Decide on a Fault Tolerance (RAID Level) method. Review Appendix
E, “Understanding Drive Arrays,” and determine an appropriate fault-
tolerance method.
2. Back up data. Although data loss is not anticipated during changing the
fault tolerance, it is a good idea to back up all data on the logical drive
you will be changing.
3. Change fault tolerance. Proceed to Chapter 5, “Running the Array
Configuration Utility,” for information on reconfiguring your drive array
with the new Fault Tolerance (RAID Level). Your system automatically
redistributes the data according to the new Fault Tolerance (RAID
Level).
4. Restart the System or Restore data.
5. Copy the backed-up data into the same logical drive.
Changing the Stripe Size of an Array
General steps for changing the stripe size of an array:
1. Review. Refer to “User Selectable Stripe-Size” in Appendix E for
information on setting stripe size and the default values for given
RAID levels.
2. Back up data. Changing the stripe size may require destroying the data
on those logical drives. You must back up all data in the logical drives
where you will be changing the stripe size.
3. Change stripe size. Proceed to Chapter 5, “ Running the Array
Configuration Utility,” for information on reconfiguring your logical
drive with the new stripe size. In this case, a data backup is required.
4. Restart the system or Restore data. Copy the backed-up data into the
same logical drives, if necessary. Your system automatically
redistributes the data according to the new striping factor.