Logical Drive Administration
See > ServeRAID System Board Controller - Setup
Use the following information to create logical drives, initialize and synchronizing logical drives, or access blocked logical drives.
Creating Logical Drives:
Each ServeRAID adapter or controller supports a maximum
of 8 logical drives. Depending upon the stripe-unit size being used, you can combine a maximum of 8 or 16 physical drives into each logical drive.
To create a logical drive:
NOTE: The number of hard disk drives in the array determines the RAID levels available for the array.
NOTE: The actual logical drive size may be slightly different from what you type in the
Requested Space field. The RAID level and the number of hard disk drives determine the size of the
For example, a disk array consisting of three, 1 GB hard disk drives with a requested RAID level-0 logical drive of 1000 MB will actually contain only 999 MB because the data is striped across all three drives, with 333 MB on each drive.
1. If you plan to use the Logical Drive Migration (LDM) feature, do not define more than seven
logical drives. The LDM feature requires one free logical drive to perform the migration. Refer
to 'Logical Drive Migration Administration' for more information.
2. If you plan to use the Change RAID Level function of the LDM feature, you must assign the same RAID level to all logical drives within a single disk array. Refer to 'Change RAID Levels' for more information.
Initializing Logical Drives: Initializing a logical drive
erases the first 1024 sectors on the drive and prevents
access to any data previously stored on the drive.
To initialize a logical drive:
Synchronizing Logical Drives: The purpose of synchronizing logical drives is to compute and write the parity data on the selected drives.
If the type of ServeRAID adapter or controller you are using does not support the auto-synchronization and data-scrubbing features, manually synchronize your RAID level-1 and RAID level-5 logical drives weekly. This does not alter data on the drive.
Synchronizing a logical drive verifies that the data redundancy for the logical drive is correct.
To synchronize a logical drive:
Unblocking Logical Drives: When the ServeRAID adapter or controller performs a Rebuild operation on an array, it reconstructs the data that was stored in RAID level-1 and RAID level-5 logical drives.
However, the ServeRAID adapter or controller cannot reconstruct the data that was stored in any RAID level-0 logical drives in that array. The data in the RAID level-0 logical drives is blocked when the ServeRAID adapter or controller detects that the array is valid, but the data might be damaged.
After the Rebuild operation completes, you can unblock the RAID level-0 logical drives and access them once again. But remember, the logical drive might contain damaged data. You must either re-create, install, or restore the data from the most recent backup disk or tape.
To unblock a blocked drive:
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