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395Administering hot-relocation
Modifying the behavior of hot-relocation
If the system goes down after the new subdisks are created on the destination
disk, but before all the data has been moved, re-execute vxunreloc when the
system has been rebooted.
Caution: Do not modify the string UNRELOC in the comment field of a subdisk
record.
Modifying the behavior of hot-relocation
Hot-relocation is turned on as long as the vxrelocd process is running. You
should normally leave hot-relocation turned on so that you can take advantage
of this feature if a failure occurs. However, if you choose to disable
hot-relocation (perhaps because you do not want the free space on your disks to
be used for relocation), you can prevent vxrelocd from starting at system
startup time by editing the startup file that invokes vxrelocd:
/sbin/init.d/vxvm-recover.
You can alter the behavior of vxrelocd as follows:
◆ To prevent vxrelocd starting, comment out the entry that invokes it in the
startup file:
# nohup vxrelocd root &
◆
By default, vxrelocd sends electronic mail to root when failures are
detected and relocation actions are performed. You can instruct vxrelocd
to notify additional users by adding the appropriate user names as shown
here:
nohup vxrelocd root user1 user2 &
◆
To reduce the impact of recovery on system performance, you can instruct
vxrelocd to increase the delay between the recovery of each region of the
volume, as shown in the following example:
nohup vxrelocd -o slow[=IOdelay] root &
where the optional IOdelay value indicates the desired delay in
milliseconds. The default value for the delay is 250 milliseconds.
After making changes to the way vxrelocd is invoked in the startup file, reboot
the system so that the changes go into effect.
You can also stop hot-relocation at any time by killing the vxrelocd process
(this should not be done while a hot-relocation attempt is in progress).
When executing vxrelocd manually, either include /etc/vx/bin in your
PATH or specify
vxrelocd’s absolute pathname, for example:
# PATH=/etc/vx/bin:$PATH
# export PATH
# nohup vxrelocd root &