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vxunreloc - move a hot-relocated subdisk back to its original disk


/etc/vx/bin/vxunreloc [-f] [-g diskgroup] [-n dm_name] [-t tasktag] dm_name


The Veritas Volume Manager (VxVM) hot-relocation feature can detect an I/O failure in a subdisk, relocate the subdisk, and recover the plex associated with the subdisk. vxunreloc lets you reverse the process and move the hot-relocated subdisks back onto a disk that was replaced after a disk failure.

dm_name specifies the disk where the hot-relocated subdisks originally resided. The -n option moves the subdisks to a different disk from where VxVM originally relocated them. For example, when disk03 fails, all the subdisks residing on it are hot-relocated to other disks. After the disk is repaired, it is added back to the disk group using a different name, for example, disk05. If you wanted to move all the hot-relocated subdisks back to the repaired disk, you would enter:

/etc/vx/bin/vxunreloc -n disk05 disk03

When vxunreloc moves the hot-relocated subdisks, it moves them to their original offsets. However, if there was a subdisk that occupied part or all of the area on the destination disk, vxunreloc prints an error message and exits. In this situation, you can use the -f option to unrelocate the subdisks to a specified disk, but not to their original offsets.



Unrelocates a subdisk to a different offset if unrelocating to the original offset is not possible.

-g diskgroup

Unrelocates a subdisk from the specified disk group. If this option is not specified, the default disk group is determined using the rules given in the vxdg(1M) manual page.

-n dm_name

Specifies a new disk name to relocate to a disk with a different name.

-t tasktag

Specifies a tag to pass to the underlying utility.



When a subdisk is hot-relocated, its original disk media name is stored in the orig_dmname field. When you run the vxunreloc command to move the subdisk back to the original disk (or to a new disk), this field is cleared. Before you run the vxunreloc command, you can do a search on this field to determine the subdisks that originated from a failed disk. For example, the following command lists all the subdisks that were hot-relocated from mydg01 in the disk group mydg. Note that you must prefix the field name with "sd_" for the command to work.

vxprint -g mydg -se 'sd_orig_dmname="mydg01"'


When a subdisk is hot-relocated, its offset into the original disk is stored in the orig_dmoffset field. When you run vxunreloc to move the subdisk to the original disk, or to a new disk, this field is zeroed. The following command lists a hot-relocated subdisk which originally resided at disk10 at offset 1000. Again note that you must prefix the field names with "sd_" for the command to work.

vxprint -g dg01 -se 'sd_orig_dmname="disk10" \
&& sd_orig_dmoffset=1000'


If the operation fails, vxunreloc exits with a non-zero status. A non-zero exit code is not a complete indicator of the problems encountered, but rather denotes the first condition that prevented further execution of the utility.

See vxintro(1M) for a list of standard exit codes.


vxassist(1M), vxintro(1M), vxmake(1M), vxprint(1M), vxrelocd(1M), vxsd(1M), vxsparecheck(1M)