User`s guide

StorageWorks RAID Array 200 Controller Installation and Standalone Configuration Utility
7–44 EK–SWRA2–IG. C01
7.4 Running Parity Check/Repair
Use Parity Check on logical RAID drives with a redundant RAID level, such as,
RAID 1, RAID 0+1, and RAID 5 to check the consistency of the RAID parity
information. When you select Parity Check, the utility reads the data from the
logical RAID drives and computes the parity for each series of blocks. Any
discrepancies between the computed parity and the parity stored on the drive are
indicated. The utility repairs parity inconsistencies by regenerating the data.
Check the parity of all of your logical RAID drives at a regular interval, and after
a power failure or a utility crash to ensure the integrity of parity and reduce the
chance of data loss.
To check the consistency of a logical RAID drive, follow these steps:
1. Select the Parity Check option on the main menu, and the utility displays the
Parity Check screen (Figure 7–23).
2. Use the up and down arrow keys to highlight a logical RAID drive and press
the Enter key to select it. The utility prompts you to enable automatic
restoration.
3. Press the Enter key to select Yes for the utility to automatically restore errors
that it finds while checking parity. The utility begins checking parity and a
status bar appears at the top of the screen, similar to the screen shown in
Figure 7–24. When the parity check completes, the utility displays a
message indicating the status of the parity check as successful or failed.
4. If the check was successful, as shown in Figure 7–25, press any key to return
to the main menu.