Add a disk for the kernel dump output

Add the disk to which kernel dumps are to be output.

We recommend that, for the kernel dump output disk, you specify a disk that is separate from the system disk. This ensures that kernel dumps can be collected even if an error occurs in a file system on the system disk (/var directory).

If the following condition is met, you do not need to add a disk:

• You want to specify a directory on the built-in disk as the kernel dump output destination:

  Go to step 1 in Specify the kernel dump output destination.

The following example show how to create a disk for kernel dump output:

1. Create a kernel dump output disk on a volume in the storage system, and then connect the disk to the host by using a single path.

2. Execute the HDLM configuration definition utility (dlmcfgmgr -r) to make HDLM recognize the kernel dump output disk.

   When the KAPL10339-I message appears, enter y.

   # /sbin/dlmcfgmgr -r
   KAPL10339-I This operation will change the configuration of HDLM devices. Do you want to continue? [y/n]: y
   KAPL10341-I The HDLM device configurations have been changed.
   KAPL10302-I /sbin/dlmcfgmgr completed normally.

3. Execute the dlmcfgmgr utility (dlmcfgmgr -v) to verify that HDLM recognizes the kernel dump output disk.

   # /sbin/dlmcfgmgr -v
   HDevName      Management  Device    Host  Channel  Target  Lun
   /dev/sddlmaa  configured  /dev/sda     0        0       0    0
                             /dev/sdc     1        0       0    0
   /dev/sddlmab  configured  /dev/sdb     0        0       0    1
                             /dev/sdd     1        0       0    1
   /dev/sddlmac  configured  /dev/sde     0        0       0    2
   KAPL10302-I /sbin/dlmcfgmgr completed normally.

   The underlined entry indicates the disk that has been added.

4. Execute the dlmcfgmgr utility (dlmcfgmgr -o) to remove the kernel dump output disk from the management target of HDLM.

   When the KAPL10339-I message appears, enter y.

   # /sbin/dlmcfgmgr -o /dev/sddlmac
   KAPL10339-I This operation will change the configuration of HDLM devices. Do you want to continue? [y/n]: y
   KAPL10341-I The HDLM device configurations have been changed.
   KAPL10302-I /sbin/dlmcfgmgr completed normally.

5. Execute the dlmcfgmgr utility (dlmcfgmgr -v) to verify that the kernel dump output disk is no longer managed by HDLM.

   # /sbin/dlmcfgmgr -v
   HDevName      Management    Device    Host  Channel  Target  Lun
   /dev/sddlmaa  configured    /dev/sda     0        0       0    0
                               /dev/sdc     1        0       0    0
   /dev/sddlmab  configured    /dev/sdb     0        0       0    1
                               /dev/sdd     1        0       0    1
   /dev/sddlmac  unconfigured  /dev/sde     0        0       0    2
   KAPL10302-I /sbin/dlmcfgmgr completed normally.

   Verify that unconfigured appears in the Management column.

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This is a SCSI disk (the disk for kernel dump output) that is not managed by HDLM. You can use multiple paths if the OS supports multiple paths.