Logical Drive Migration Administration

Logical Drive Migration Administration

The logical drive migration (LDM) feature dynamically changes the current logical drive structure.
You can use this procedure to change the RAID level, increase the free space in a disk array, or change the size of a logical drive.

To use the LDM feature, you must have at least two logical drives available: one free (FRE) logical drive and one source logical drive that is in the okay (OKY) state.
During the LDM procedure, the ServeRAID adapter or controller changes the state of the FRE logical drive to SYS; then, temporarily uses the SYS drive to perform the migration.
When the migration procedure completes, the ServeRAID adapter or controller changes the state of the SYS drive back to FRE.

Change RAID Levels:

 
You can change (migrate) the RAID levels of currently defined logical drives.
To use the Change RAID Level feature, all of the logical drives within the array must be the same RAID level.

The ServeRAID adapters and controllers support changing RAID levels as follows:

•  Change two-drive RAID level-0 to RAID level-5 by adding one hard disk drive
•  Change two-drive RAID level-1 to RAID level-5 by adding one hard disk drive
•  Change from RAID level-5 to RAID level-0 by removing one hard disk drive

1. Click on the   icon on the Tool Bar or select Manage Disk Arrays from
    the Advanced pull-down menu; then, select Logical Drive Migration.

    A screen similar to the following appears.
   

    
   
2.  Select Change RAID Level.
3.  Click on OK.
    
   
4.  Select a migrating option from the pull-down list.

   Note: The affected logical drives appear, based on the migrating option you select.

5.  Click on OK to proceed.
6.  Click on OK to verify the operation.
7.  Select a Ready (RDY) drive to add to the array, if you are migrating to RAID level-5.

Adding a Physical Drive:

  You can expand currently defined arrays by adding one to three new hard disk drives.

The ServeRAID adapters and controllers support adding new space to a disk array in the following scenarios:

•  You can increase the free space in a disk array without changing the size of the logical drives.
   This is useful when you need to add logical drives to your existing disk arrays.
   Refer to the following illustration.
   
   For example, an existing disk array uses three, 2150 MB hard disk drives that are configured as two RAID level-5 logical drives  (one 500 MB and 1000 MB) and 2800 MB of free space.
   If you use the logical drive migration procedure and add a 2150 MB hard disk drive to increase the amount of free space, the end  result will be two RAID level-5 logical drives (one 500 MB and one 1000 MB) and with 4950 MB of free space.
•  You can increase the size of all the logical drives proportionally in a disk array.
   This is useful when you want to increase the size of the currently defined logical drives.
   Refer to the following illustration.
   
   For example, an array uses three 2150 MB hard disk drives that are configured as two RAID level-5 logical drives
   (one 500 MB and 1000 MB) and 2800 MB of free space.
   If you use the logical drive migration procedure and add a 2150 MB hard disk drive to proportionally increase the size of the disk array, the end  result will be two RAID level-5 logical drives (one 750 MB and 1500 MB) and 4200 MB of free space.

1. Click on the   icon on the Tool Bar or select Manage Disk Arrays from
    the Advanced pull-down menu; then, select Logical Drive Migration.
    A screen similar to the following appears.
    
   
2.  Select Add Physical Drive(s).

    A prompt appears requesting that you select from 1 to 3 Ready (RDY) drives to add to the existing array.

3.  Click on the appropriate RDY drives on the Main screen.
    An X appears beside the selected drives.
4.  When you are finished selecting drives, click on OK.
    
   
5.  Select one of the available expansion options from the pull-down list.
    The screen will show a list of the affected logical drives with their new sizes.
6.  Click on OK.

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