This document describes how to restore a savevg image with a larger PPsize. Information in this document is valid for AIX Versions 4.1.x and 4.2.x.
WARNING: This procedure is valid ONLY with a savevg image and will not work with a Sysback 6000 system backup.
If the ability to rerun the savevg is available, the following procedure allows you to create a savevg with a larger PPsize.
mkvgdata <vgname>
vgname is the name of the volume group to be backed up.
cd /tmp/vgdata/<vgname>
vi <vgname>.data
To view and edit the file, execute:
vi <vgname>.data
Example 1
vg_data:
VGNAME= <vgname>
--> PPSIZE= 4
VARYON= yes
VG_SOURCE_DISK_LIST= hdisk1
QUORUM= 2
CONC_CAPABLE= no
CONC_AUTO= no
Example 2
vg_data:
VGNAME= <vgname>
--> PPSIZE= 8
VARYON= yes
VG_SOURCE_DISK_LIST= hdisk1
QUORUM= 2
CONC_CAPABLE= no
CONC_AUTO= no
Example 3
lv_data:
VOLUME_GROUP= <vgname>
LV_SOURCE_DISK_LIST= hdisk1
LV_IDENTIFIER= 00000001113f3c62.5
LOGICAL_VOLUME= lv00
VG_STAT= active/complete
TYPE= jfs
MAX_LPS= 512
COPIES = 1
--> LPs = 70
STALE_PPs= 0
INTER_POLICY= minimum
INTRA_POLICY= center
MOUNT_POINT= /apps
MIRROR_WRITE_CONSISTENCY= on
LV_SEPARATE_PV= yes
PERMISSION= read/write
LV_STATE= opened/syncd
WRITE_VERIFY= off
--> PP_SIZE= 4
SCHED_POLICY= parallel
--> PP = 70
BB_POLICY= relocatable
RELOCATABLE= yes
UPPER_BOUND= 32
LABEL= /apps
MAPFILE=
--> LV_MIN_LPS= 68
Example 4
lv_data:
VOLUME_GROUP= <vgname>
LV_SOURCE_DISK_LIST= hdisk1
LV_IDENTIFIER= 00000001113f3c62.5
LOGICAL_VOLUME= lv00
VG_STAT= active/complete
TYPE= jfs
MAX_LPS= 512
COPIES = 1
--> LPs = 35
STALE_PPs= 0
INTER_POLICY= minimum
INTRA_POLICY= center
MOUNT_POINT= /apps
MIRROR_WRITE_CONSISTENCY= on
LV_SEPARATE_PV= yes
PERMISSION= read/write
LV_STATE= opened/syncd
WRITE_VERIFY= off
--> PP_SIZE= 8
SCHED_POLICY= parallel
--> PP = 35
BB_POLICY= relocatable
RELOCATABLE= yes
UPPER_BOUND= 32
LABEL= /apps
MAPFILE=
--> LV_MIN_LPS= 34
NOTE: In example 2, the PPsize has been changed from 4 to 8. In example 4, the LPs (logical partitions) have been divided by two, the PP_SIZE has been changed to 8, the PP (physical partitions) has been divided by two, and the LV_MIN_LPS has also been divided by two. The division of the LPs, PP, and LV_MIN_LPS is necessary so that the logical volume is created at the same size. The following is a division table to use as a reference:
Original PPsize New PPsize Divide the LPs, LV_MIN_LPS by
4 8 2
4 16 4
4 32 8
8 16 2
8 32 4
16 32 2
If, when you are dividing, a half number is achieved, simply round up to the nearest whole number. So if the LPs and PP are at 51 and you divide this by 2 (51/2 = 25.5), round up the result to 26.
Once all the changes have been made, save the file and exit.
savevg -f /dev/rmtX <vgname>
X is the number of your tape device.
WARNING: Do not run the savevg in SMIT because this will update the <vgname>.data file and overwrite any changes made.
WARNING: Do not run the savevg with the -i flag because this will update the <vgname>.data file as well.
If another savevg cannot be run, the following procedure can be used to restore a savevg with a larger PPsize.
All references to the tape device in the next section are as rmt0.
rm -r /tmp/vgdata
cd /
restore -xqvdf /dev/rmt0 ./tmp/vgdata
cd /
find ./tmp/vgdata -print |backup -iqvf /tmp/vg.back
This should back up the following files:
./tmp/vgdata
./tmp/vgdata/vgdata.files
./tmp/vgdata/<vgname>
./tmp/vgdata/<vgname>/filesystems
./tmp/vgdata/<vgname>/<vgname>.data
vgname is the name of your volume group.
restore -Tqvf /tmp/vg.back
restvg -f /tmp/vg.back hdisk# hdisk#
Verify that the volume group and file systems were recreated. Enter:
lsvg -l <vgname>
Verify the file systems mounted. Enter:
mount
cd / restore -xqvdf /dev/rmt0
[ Doc Ref: 91745667913562 Publish Date: May. 08, 2000 4FAX Ref: 2483 ]