Sysdump and unmirroring Post: 302226441

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Operating Systems AIX Sysdump and unmirroring Post 302226441 by Locki on Tuesday 19th of August 2008 04:15:10 AM

08-19-2008

Registered User

you can do it in few ksh commands. Let's suppose :

your sysdumpdev has been created with the right LV type (sysdump)
your rootvg is on the two disks hdisk0 and hdisk1
you have verified the settings for your sysdump device with the command : sysdumpdev -l, and found something like that :

primary /dev/mysysdumplv
secondary /dev/null
...

otherwise you should issue the following command :
sysdumpdev -P -s /dev/null

you verified that your sysdump device was actually on the first disk, the following command :

lslv -m mysysdumplv | sed 1,2d | awk '{ print $3}' | uniq
should return only "hdisk0"

you verified that for each lv, each copy was on only one disk (when growing FS, if you just issued uncontrolled "chfs" commands on FS built upon mirrored LV, it may happened that copies are mixed between both disks !)

then you can do the following :

LVS=$( lsvg -l rootvg | sed 1,2d | awk '{ if ($2 != "sysdump") print $1; }' )
for lv in $LVS; do
echo "removing $lv copy from hdisk1" # not to be in front of a desperatly black screen while everything is proceeding
rmlvcopy $lv 1 hdisk1
done
lspv -l hdisk1 # to be sure there's nothing left on it
reducevg rootvg hdisk1
# don't forget to modify the bootlist
bootlist -m normal -o hdisk0
bosboot -ad hdisk0

and it should do it ! you should have a whole drive just to do an alternate disk install of your mksysb with patches.

Last edited by Locki; 08-19-2008 at 05:36 AM..

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vxdestroy_lvmroot

vxdestroy_lvmroot(1M)													     vxdestroy_lvmroot(1M)

NAME

       vxdestroy_lvmroot - remove LVM root disk and associated LVM volume group

SYNOPSIS

       vxdestroy_lvmroot [-v] [-b] lvm_root_disk

DESCRIPTION

       The  vxdestroy_lvmroot  command	tears  down  and removes the LVM volume group associated with the specified physical disk. This is done by
       removing the volumes in the volume group and then removing the volume group.

OPTIONS

       -b	 Invokes the setboot command to change the primary boot disk to the VxVM root disk from which the system was booted (if  the  pri-
		 mary  boot  disk is not already set to this disk).  The alternate boot device remains unchanged.  If the -v option is also speci-
		 fied, the settings of the primary and alternate boot devices are displayed.

       -v	 Outputs verbose messages including a timestamp that indicates major operations being performed.

ARGUMENTS

       lvm_root_disk
	    Specifies the device name of the LVM root disk that is to be destroyed, along with its entire volume group.

EXAMPLES

       This example shows the vxdestroy_lvmroot command invoked in its simpliest form:

       /etc/vx/bin/vxdestroy_lvmroot c5t1d0

       # /etc/vx/bin/vxdestroy_lvmroot -v -b c3t0d0
       Are you sure about destroying c3t0d0 (imported on VG /dev/vg02) ? YES
       vxdestroy_lvmroot 06:02: Tearing down /dev/vg02 on device c3t0d0
       vxdestroy_lvmroot 06:02:
	 Unmounting and removing any volumes associated with /dev/vg02
       vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol1
       vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol2
       vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol3
       vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol4
       vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol5
       vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol6
       vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol7
       vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol8
       vxdestroy_lvmroot 06:02: Removing Volume Group /dev/vg02
       vxdestroy_lvmroot 06:02: Removing device files in /dev/vg02
       vxdestroy_lvmroot 06:02: Removing LVM Physical Volume c3t0d0
       vxdestroy_lvmroot 06:02: Removing LVM Physical Volume c1t1d3
       vxdestroy_lvmroot 06:02: Removing LVM Physical Volume c1t1d4
       vxdestroy_lvmroot 06:02: Removing LVM Physical Volume c1t1d5
       vxdestroy_lvmroot 06:03: Current setboot values:
       vxdestroy_lvmroot 06:03: Primary:       0/0/6/0/0.0.0
       vxdestroy_lvmroot 06:03: Alternate:     0/0/1/0/0.1.0
       vxdestroy_lvmroot 06:03:
	 Making disk c0t1d0 (0/0/1/0/0.1.0) the primary boot disk
       vxdestroy_lvmroot 06:03:
	 Removal of device c3t0d0, volume group /dev/vg02 was successful

SEE ALSO

       cpio(1), dd(1), fsck(1M), setboot(1M) vxbootsetup(1M) vxcp_lvmroot(1M) vxres_lvmroot(1M)

VxVM 5.0.31.1							    24 Mar 2008 					     vxdestroy_lvmroot(1M)