VERITAS Volume Manager 4.1 Administrator's Guide

Administering Hot-Relocation
Modifying the Behavior of Hot-Relocation
Chapter 9 349
Modifying the Behavior of Hot-Relocation
Hot-relocation is turned on as long as vxrelocd is running. You leave
hot-relocation turned on so that you can take advantage of this feature if
a failure occurs. However, if you choose to disable this feature (perhaps
because you do not want the free space on some of your disks to be used
for relocation), prevent vxrelocd from starting at system startup time.
You can stop hot-relocation at any time by killing the vxrelocd process
(this should not be done while a hot-relocation attempt is in progress).
You can make some minor changes to the way vxrelocd behaves by
either editing the vxrelocd line in the startup file that invokes
vxrelocd (/sbin/rc2.d/S95vxvm-recover), or by killing the existing
vxrelocd process and restarting it with different options. After making
changes to the way vxrelocd is invoked in the startup file, you need to
reboot the system so that the changes go into effect. If you choose to kill
and restart the daemon instead, make sure that hot-relocation is not in
progress when you kill the vxrelocd process. You should also restart the
daemon immediately so that hot-relocation can take effect if a failure
occurs.
You can alter vxrelocd behavior 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.