Recovery - Check Array Redundancy - IBM System Storage DS3500 Introduction And Implementation Manual

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14.14.12 Recovery - check array redundancy

You can use the Check Array Redundancy function to check the redundancy on a selected
array.
Note: You should normally only use this option under the guidance of your IBM Customer
Support representative.
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.
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IBM System Storage DS3500: Introduction and Implementation Guide
Draft Document for Review March 28, 2011 12:24 pm