Mirror recovery consistency : How to change ??

Madeswaran N

Mirror write performance on swap logical volumes may be enhanced by disabling the Mirror Write Cache. If the primary swap volume is also configured as a dump volume, it’s critical to change the consistency recovery policy to NONE to avoid corrupting dump data in case of a system panic.

  1. Check the current consistency recovery policy on lvol2.

# lvdisplay /dev/vg00/lvol2 | grep Consistency
Consistency Recovery MWC

  1. Reboot the system.

            # shutdown –ry 0

  1. Interrupt the boot process and boot to the LVM maintenance mode. Note: You will need a telnet window to the system console. In the HPVL, you will connect via a terminal server, so use the host name and root password for the initial login.

EFI Boot Manager ver 1.10 [14.61] Firmware ver 2.31 [4411]
Please select a boot option
HP-UX Primary Boot: 0/1/1/0.0x1.0x0
HP-UX HA Alternate Boot: 0/1/1/0.0x0.0x0
EFI Shell [Built-in]
Boot Option Maintenance Menu
System Configuration Menu
Loading.: HP-UX Primary Boot: 0/1/1/0.0x1.0x0
Starting: HP-UX Primary Boot: 0/1/1/0.0x1.0x0
(C) Copyright 1999-2006 Hewlett-Packard Development Company, L.P.
All rights reserved
HP-UX Boot Loader for IPF -- Revision 2.035
Press Any Key to interrupt Autoboot
\EFI\HPUX\AUTO ==> boot vmunix -lq
Seconds left till autoboot - 4
Type 'help' for help
HPUX> boot vmunix -lm
> System Memory = 4083 MB
loading section 0
............................................................................ (complete)
loading section 1
............. (complete)
loading symbol table
loading System Directory (boot.sys) to MFS
.....
loading MFSFILES directory (bootfs) to MFS
...........................
Launching /stand/vmunix
SIZE: Text:38714K + Data:6257K + BSS:20686K = Total:65658K
Console is on Serial Device
Booting kernel...
.
.
.
INIT: SINGLE USER MODE
INIT: Running /sbin/sh
#

  1. Activate the volume group vg00, change the consistency recovery policy, and update the BDRA.

# vgchange –a y vg00
vmunix: LVM: Root VG activated

  1. Change the mirror consistency policy using the lvchange command.

# lvchange –M n –c n /dev/vg00/lvol2
Logical volume "/dev/vg00/lvol2" has been successfully changed.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf

  1. Update the BDRA using the lvlnboot -R command.

# lvlnboot -R
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
#

  1. Use the lvdisplay command to verify that the change succeeded.

# lvdisplay /dev/vg00/lvol2
...
Consistency Recovery NONE

  1. Reboot the system. Note that you must always reboot the system after using the LVM maintenance mode.

# reboot


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