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394 Administering hot-relocation
Moving and unrelocating subdisks
Examining which subdisks were hot-relocated from a disk
If a subdisk was hot relocated more than once due to multiple disk failures, it
can still be unrelocated back to its original location. For instance, if mydg01
failed and a subdisk named mydg01-01 was moved to mydg02, and then
mydg02 experienced disk failure, all of the subdisks residing on it, including the
one which was hot-relocated to it, will be moved again. When mydg02 was
replaced, a
vxunreloc operation for mydg02 will do nothing to the hot-relocated
subdisk mydg01-01. However, a replacement of mydg01 followed by a
vxunreloc operation, moves mydg01-01 back to mydg01 if vxunreloc is run
immediately after the replacement.
After the disk that experienced the failure is fixed or replaced, vxunreloc can
be used to move all the hot-relocated subdisks back to the disk. When a subdisk
is hot-relocated, its original disk-media name and the offset into the disk are
saved in the configuration database. When a subdisk is moved back to the
original disk or to a new disk using vxunreloc, the information is erased. The
original disk-media name and the original offset are saved in the subdisk
records. To print all of the subdisks that were hot-relocated from mydg01 in the
mydg disk group, use the following command:
# vxprint -g mydg -se 'sd_orig_dmname="mydg01"'
Restarting vxunreloc after errors
vxunreloc moves subdisks in three phases:
■ vxunreloc creates as many subdisks on the specified destination disk as
there are subdisks to be unrelocated. The string UNRELOC is placed in the
comment field of each subdisk record.
Creating the subdisk is an all-or-nothing operation. If vxunreloc cannot
create all the subdisks successfully, none are created, and vxunreloc exits.
■ vxunreloc moves the data from each subdisk to the corresponding newly
created subdisk on the destination disk.
■ When all subdisk data moves have been completed successfully, vxunreloc
sets the comment field to the null string for each subdisk on the destination
disk whose comment field is currently set to UNRELOC.
The comment fields of all the subdisks on the destination disk remain marked as
UNRELOC until phase 3 completes. If its execution is interrupted,
vxunreloc can
subsequently re-use subdisks that it created on the destination disk during a
previous execution, but it does not use any data that was moved to the
destination disk.
If a subdisk data move fails, vxunreloc displays an error message and exits.
Determine the problem that caused the move to fail, and fix it before
re-executing vxunreloc.