Machine Administration Guide 2.6

B.2.1.1 When using SynfinityDisk/GDS

When using SynfinityDisk/GDS, the following four disk unmount modes are available and can be selected according to the operating mode.

• Automatic unmounting by GDS
  This mode can be used when using GDS4.1A30 or later (see Section B.4, "Setting up the GDS Automatic Unmount function").
  Upon detection of a disk error, GDS automatically performs all necessary operations including logical unmounting, electrical disconnection, and notification to Machine Administration.
  You need not manually unmount the disk drive before starting replacement.
  After automatic unmounting is performed, the following message is displayed in /var/adm/messages:

  Aug  6 17:29:46 host00 SDX:sdxservd: [ID 702911 user.error] ERROR: disk000001:
   /dev/rdsk/c0t2d0s0: ready for swapping due to I/O error, class=class0001

Alternatively, the GUI screen of GDS will display the disk as being in the SWAP state, as shown below.

• Manual unmounting using the SynfinityDisk/GDS GUI menu
  Selecting "Swap Physical Disk" from the SynfinityDisk/GDS GUI menu triggers this function.
  The function executes only unmounting from SynfinityDisk/GDS, and notifies Machine Administration.

  

  In this case, operation executed electrical disconnection is performed by the Machine Administration menu operation executed during replacement.

• Manual unmounting using the SynfinityDisk/GDS sdxswap command
  You can use sdxswap to perform logical unmounting.
  For the sdxswap command arguments, specify the class name and SDX disk name used by SynfinityDisk/GDS. For more information, refer to the "SynfinityDisk Handbook" or "PRIMECLUSTER Global Disk Services Handbook."

  # /usr/sbin/sdxswap -O -c <class name> -d <SDX disk name>

  In addition, you have to notify Machine Administration using the diskswap command.
  For the diskswap command argument, specify the logical device path of slice No. 0 of the relevant disk.

  # /usr/sbin/FJSVmadm/diskswap add <logical device path>

In this case, electrical disconnection is performed by the Machine Administration menu operation executed during replacement.

• Cold swap
  The relevant disk is replaced with the system stopped.
  In this mode, the unmount operation is not required.