IBM DS3500 - Recovery - Check Array Redundancy

7914support2-0209.fm Draft Document for Review March 28, 2011 12:24 pm
442 IBM System Storage DS3500: Introduction and Implementation Guide
14.14.12 Recovery - check array redundancy
You can use the Check Array Redundancy function to check the redundancy on a selected
array.
Keep these important guidelines in mind before you check data redundancy on an array:
򐂰 You cannot use this option on RAID Level 0 arrays that have no redundancy.
򐂰 If you use this option on a RAID Level 1/10 array, the redundancy check compares the
data on the mirrored drives.
򐂰 If you perform this operation on a RAID Level 3, RAID Level 5, or RAID Level 6 array, the
redundancy check inspects the parity information that is striped across the drives.
To successfully perform this operation, all of these conditions must be true:
򐂰 The logical drives in the array must be in Optimal status
򐂰 The array must have no logical drive modification operations in progress.
򐂰 You can perform this operation only on one array at a time. However, you can perform a
redundancy check on selected logical drives during a media scan operation. You can
enable a media scan redundancy check on one or more logical drives in the storage
subsystem.
Follow this procedure to check the redundancy of an array:
1. Select the array in the Logical tab of the DS Storage Manager (subsystem Management)
window and then select the Advanced  Recovery  Check Array Redundancy menu
command as shown in Figure 14-151 on page 443.
Note: You should normally only use this option under the guidance of your IBM Customer
Support representative.