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Checking major and minor numbers for disk partitions

The following sections describe checking and changing, if necessary, the major and minor numbers for disk partitions used by cluster nodes.

 To check major and minor numbers on disk partitions

• Use the following command on all nodes exporting an NFS file system. This command displays the major and minor numbers for the block device.

  # ls -lL block_device

  The variable block_device refers to a partition on which a file system is mounted for export via NFS. Use this command on each NFS file system. For example, type:

  # ls -lL /dev/dsk/c1t1d0s3

  Output on Node A resembles:

  crw-r-----  1 root  sys  32,1 Dec 3 11:50 /dev/dsk/c1t1d0s3

  Output on Node B resembles:

  crw-r-----  1 root  sys  32,1 Dec 3 11:55 /dev/dsk/c1t1d0s3

  Note that the major numbers (32) and the minor numbers (1) match, satisfactorily meeting the requirement for NFS file systems.

 To reconcile major numbers that do not match on disk partitions

1. Reconcile the major and minor numbers, if required. For example, if the output in the previous section resembles the following, perform the instructions beginning step 2:

   Output on Node A:

   crw-r-----  1 root  sys  32,1 Dec 3 11:50 /dev/dsk/c1t1d0s3

   Output on Node B:

   crw-r-----  1 root  sys  36,1 Dec 3 11:55 /dev/dsk/c1t1d0s3

2. Place the VCS command directory in your path. For example:

   # export PATH=$PATH:/usr/sbin:/sbin:/opt/VRTS/bin

3. Attempt to change the major number on System B (now 36) to match that of System A (32). Use the command:

   # haremajor -sd major_number

   For example, on Node B, enter:

   # haremajor -sd 32

4. If the command succeeds, go to step 8.
5. If the command fails, you may see a message resembling:

   Error: Preexisiting major number 32

   These are available numbers on this system: 128...

   Check /etc/name_to_major on all systems for

   available numbers.

6. Notice that the number 36 (the major number on Node A) is not available on Node B. Run the haremajor command on Node B and change it to 128,

   # haremajor -sd 128

7. Run the same command on Node A. If the command fails on Node A, the output lists the available numbers. Rerun the command on both nodes, setting the major number to one available to both.
8. Reboot each system on which the command succeeds.
9. Proceed to reconcile the major numbers for your next partition.

 To reconcile minor numbers that do not match on disk partitions

1. Complete the following steps. In the example, the minor numbers are 1 and 3 and are reconciled by setting to 30 on each node.
2. Type the following command on both nodes using the name of the block device:

   # ls -1 /dev/dsk/c1t1d0s3

   Output from this command resembles the following on Node A:

   lrwxrwxrwx  1 root  root  83 Dec 3 11:50

   /dev/dsk/c1t1d0s3 -> ../../

   devices/sbus@1f,0/QLGC,isp@0,10000/sd@1,0:d,raw

   The device name (in bold) includes the slash following the word devices, and continues to, but does not include, the colon.

3. Type the following command on both nodes to determine the instance numbers used by the SCSI driver:

   # grep sd /etc/path_to_inst | sort -n -k 2,2

   Output from this command resembles the following on Node A:

"/sbus@1f,0/QLGC,isp@0,10000/sd@0,0" 0 "sd"

"/sbus@1f,0/QLGC,isp@0,10000/sd@1,0" 1 "sd"

"/sbus@1f,0/QLGC,isp@0,10000/sd@2,0" 2 "sd"

"/sbus@1f,0/QLGC,isp@0,10000/sd@3,0" 3 "sd"

.

.

"/sbus@1f,0/SUNW,fas@e,8800000/sd@d,0" 27 "sd"

"/sbus@1f,0/SUNW,fas@e,8800000/sd@e,0" 28 "sd"

"/sbus@1f,0/SUNW,fas@e,8800000/sd@f,0" 29 "sd"

In the output, the instance numbers are in the second field. The instance number associated with the device name that matches the name for Node A displayed in step 2, is "1."

4. Compare instance numbers the device in the output on each node.
   • If the instance number from one node is not used on the other (that is, it does not appear in the output of step 3), edit /etc/path_to_inst to make the second node's instance number similar to that of the first node.
   • If the instance numbers are being used on both nodes, edit /etc/path_to_inst on both nodes. Change the instance number associated with the device name to an unused number greater than the highest number used by other devices. For example, the output of step b shows the instance numbers used by all devices (from 0 to 29), so edit the file /etc/path_to_inst on each node and reset the instance numbers to 30.
5. Type the following command to reboot each node on which /etc/path_to_inst was modified:

   # reboot -- -rv