Splitting the boot drive mirror

This topic describes the steps for splitting the mirrored boot drives into two separate drives.

Context

You should consider temporarily disabling the mirroring capabilities of the boot drive before you begin upgrading to version 2.1. This allows you to keep version 1.1 of the SAN File System on one drive while you upgrade to version 2.1 using the other drive. If you need to restore your version 1.1 boot drive configuration, you can reconfigure your boot drive mirror with the secondary drive as the “primary mirror device,” and your recently installed primary drive as the “secondary mirror device.” Otherwise, after you are satisfied with your upgrade to version 2.1, you can recreate the mirror with the newly installed primary drive as the “primary mirror device” and the secondary drive as the “secondary mirror device.”
Note: Keep in mind that while the mirrored drives are split, the high availability protection provided by the RAID mirroring is disabled (each drive becomes a single point of failure during this installation window).

For information about splitting the mirrored boot drive, see the Device Management Users Guide, which is available at this website:

www.lsilogic.com

Steps

  1. Reboot the engine.
  2. Watch the boot sequence carefully and press Ctrl-c when the LSI message appears.
  3. Select the first device and press Enter.
  4. Select Mirroring Properties.
  5. Change the properties from Primary and Secondary to No.
  6. Save the configuration and exit.
  7. After the engine finishing booting, perform a test mount to verify that you have access to the boot drive.
    mount /dev/sdb1 /mnt 
    umount /mnt

Parent topic: Preparing the first engine for upgrade

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