LVM: Unmirror/Mirror "rootvg" Volume Group
Article Number: 21 | Rating: Unrated | Last Updated: Mon, May 21, 2018 9:25 PM
Tested on AIX 5.3
# UN-MIRRORING "rootvg"
# ------------------------------------------------------------------------------------------
# We are un-mirroring a "rootvg" VG distributed on "hdisk0" & "hdisk1" disks like this one
# (we'll take "hdisk1" out of the mirror for whatever reason):
lspv | grep rootvg
hdisk0 0039c23db037da0b rootvg active
hdisk1 0039c23db037dae6 rootvg active
lsvg -l rootvg
rootvg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
hd5 boot 1 2 2 closed/syncd N/A
hd6 paging 128 256 2 open/syncd N/A
hd8 jfslog 1 2 2 open/syncd N/A
hd4 jfs 1 2 2 open/syncd /
hd2 jfs 14 28 2 open/syncd /usr
hd9var jfs 8 16 2 open/syncd /var
hd3 jfs 8 16 2 open/syncd /tmp
lv_dump2 sysdump 32 32 1 open/syncd N/A
hd10opt jfs 8 16 2 open/syncd /opt
loglv00 jfs2log 1 2 2 open/syncd N/A
localoptlv jfs2 309 618 2 open/stale /local/opt
lv_dump1 sysdump 32 32 1 open/syncd N/A
fslv00 jfs2 8 16 2 open/stale /local/home
lspv -l hdisk0
hdisk0:
LV NAME LPs PPs DISTRIBUTION MOUNT POINT
hd10opt 8 8 00..00..01..00..07 /opt
hd3 8 8 00..00..08..00..00 /tmp
hd9var 8 8 00..00..08..00..00 /var
hd2 14 14 00..00..11..01..02 /usr
hd4 1 1 00..00..01..00..00 /
hd8 1 1 00..00..01..00..00 N/A
hd6 128 128 00..101..27..00..00 N/A
hd5 1 1 01..00..00..00..00 N/A
fslv00 8 8 00..00..01..07..00 /local/home
lv_dump1 32 32 00..00..32..00..00 N/A
localoptlv 309 309 108..08..19..101..73 /local/opt
loglv00 1 1 01..00..00..00..00 N/A
lspv -l hdisk1
hdisk1:
LV NAME LPs PPs DISTRIBUTION MOUNT POINT
hd10opt 8 8 00..00..08..00..00 /opt
lv_dump2 32 32 00..00..00..00..32 N/A
hd3 8 8 00..00..08..00..00 /tmp
hd9var 8 8 00..00..08..00..00 /var
hd2 14 14 00..00..14..00..00 /usr
hd4 1 1 00..00..01..00..00 /
hd8 1 1 00..00..01..00..00 N/A
hd6 128 128 00..109..19..00..00 N/A
hd5 1 1 01..00..00..00..00 N/A
fslv00 8 8 00..00..00..00..08 /local/home
localoptlv 309 309 108..00..50..109..42 /local/opt
loglv00 1 1 01..00..00..00..00 N/A
# First of all verify if there are any volumes belonging to "hdisk1" acting as dump device;
# if this is the cas, we'll free them up:
sysdumpdev -l
primary /dev/lv_dump1
secondary /dev/lv_dump2 <---
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression ON
sysdumpdev -s /dev/sysdumpnull
primary /dev/lv_dump1
secondary /dev/sysdumpnull <---
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression ON
# Let's remove "/dev/lv_dump2" from "hdisk1"
rmlv lv_dump2
# ... and, finally, completely un-mirror rootvg (take out "hdisk1"):
reducevg rootvg hdisk1
# RE-MIRRORING "rootvg"
# ------------------------------------------------------------------------------------------
# We are re-constructing mirror that was split on previous step or just mirroring "rootvg"
# in order to have a redundancy is case of problems with one of the boot disks
# Verify that the disk where we are creating the mirror, "hdisk1", is not in use - It
# doesn't belong to any VG ("None") -
lspv
hdisk0 0039c23db037da0b rootvg active
hdisk1 0039c23db037dae6 None
[...]
# Just for info, check Logical Volume distribution on both disks
lspv -l hdisk0
hdisk0:
LV NAME LPs PPs DISTRIBUTION MOUNT POINT
hd10opt 8 8 00..00..01..00..07 /opt
hd3 8 8 00..00..08..00..00 /tmp
hd9var 8 8 00..00..08..00..00 /var
hd2 14 14 00..00..11..01..02 /usr
hd4 1 1 00..00..01..00..00 /
hd8 1 1 00..00..01..00..00 N/A
hd6 128 128 00..101..27..00..00 N/A
hd5 1 1 01..00..00..00..00 N/A
fslv00 8 8 00..00..01..07..00 /local/home
lv_dump1 32 32 00..00..32..00..00 N/A
localoptlv 309 309 108..08..19..101..73 /local/opt
loglv00 1 1 01..00..00..00..00 N/A
lspv -l hdisk1
0516-320 : Physical volume 0039c23db037dae60000000000000000 is not assigned to
a volume group.
# Extend "rootvg" with the new disk (it system detects that there is any information on
# disk belonging to an old VG it may be necessary to use -f option, like here)
extendvg rootvg hdisk1
0516-1398 extendvg: The physical volume hdisk1, appears to belong to
another volume group. Use the force option to add this physical volume
to a volume group.
0516-792 extendvg: Unable to extend volume group.
extendvg -f rootvg hdisk1
lspv
hdisk0 0039c23db037da0b rootvg active
hdisk1 0039c23db037dae6 rootvg active
[...]
# Mirror all "rootvg" volumes on "hdisk1". For the moment we won't synchronize data, that
# will be done on a further step
mirrorvg -s rootvg hdisk1
0516-1804 chvg: The quorum change takes effect immediately.
0516-1126 mirrorvg: rootvg successfully mirrored, user should perform
bosboot of system to initialize boot records. Then, user must modify
bootlist to include: hdisk0 hdisk1.
# -s Disable Sync
# Returns the mirrorvg command immediately without performing any type of mirror
# synchronization. If this option is used, the mirror may exist for a logical volume
# but is not used by the operating system until it has been synchronized with the
# syncvg command.
# Check number of copies (PVs) of each volume. Note that for lv_dump1 there is only
# one copy. This is because system has detected that lv_dump1 corresponds to a
# dump device that shouldn't be mirrored. We'll create manually another copy of dump
# device on a new volume on mirror disk...
lsvg -l rootvg
rootvg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
hd5 boot 1 2 2 closed/stale N/A
hd6 paging 128 256 2 open/stale N/A
hd8 jfslog 1 2 2 open/stale N/A
hd4 jfs 1 2 2 open/stale /
hd2 jfs 14 28 2 open/stale /usr
hd9var jfs 8 16 2 open/stale /var
hd3 jfs 8 16 2 open/stale /tmp
hd10opt jfs 8 16 2 open/stale /opt
loglv00 jfs2log 1 2 2 open/stale N/A
localoptlv jfs2 309 618 2 open/stale /local/opt
lv_dump1 sysdump 32 32 1 open/syncd N/A <---
fslv00 jfs2 8 16 2 open/stale /local/home
mklv -t sysdump -y lv_dump2 rootvg 32 hdisk1
lv_dump2
lsvg -l rootvg
rootvg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
hd5 boot 1 2 2 closed/stale N/A
hd6 paging 128 256 2 open/stale N/A
hd8 jfslog 1 2 2 open/stale N/A
hd4 jfs 1 2 2 open/stale /
hd2 jfs 14 28 2 open/stale /usr
hd9var jfs 8 16 2 open/stale /var
hd3 jfs 8 16 2 open/stale /tmp
lv_dump2 sysdump 32 32 1 closed/syncd N/A <---
hd10opt jfs 8 16 2 open/stale /opt
loglv00 jfs2log 1 2 2 open/stale N/A
localoptlv jfs2 309 618 2 open/stale /local/opt
lv_dump1 sysdump 32 32 1 open/syncd N/A <---
fslv00 jfs2 8 16 2 open/stale /local/home
# ...and configure dump device correctly (as it was before un-mirroring "rootvg")
sysdumpdev -l
primary /dev/lv_dump1
secondary /dev/sysdumpnull <---
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression ON
sysdumpdev -s /dev/lv_dump2
primary /dev/lv_dump1
secondary /dev/lv_dump2 <---
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression ON
# Check list of boot devices and add "hdisk1"
bootlist -m normal -o
hdisk0 blv=hd5
hdisk1
bosboot -ad hdisk1
bosboot: Boot image is 44765 512 byte blocks.
bootlist -m normal -o
hdisk0 blv=hd5
hdisk1 blv=alt_hd5 <--- It will remain like that until disk data
is synchronized between disks in "rootvg"
# And, finally, synchronize data on "rootvg" volumes
varyonvg rootvg
# Alternatively, we can use following command:
# syncvg -v rootvg
# Check status of Volume Group
lsvg rootvg
VOLUME GROUP: rootvg VG IDENTIFIER: 0039c23d00004c000000011a95b978c9
VG STATE: active PP SIZE: 128 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 1092 (139776 megabytes)
MAX LVs: 256 FREE PPs: 54 (6912 megabytes)
LVs: 13 USED PPs: 1038 (132864 megabytes)
OPEN LVs: 12 QUORUM: 1 (Disabled)
TOTAL PVs: 2 VG DESCRIPTORS: 3
STALE PVs: 1 STALE PPs: 486
ACTIVE PVs: 2 AUTO ON: yes
MAX PPs per VG: 32512
MAX PPs per PV: 1016 MAX PVs: 32
LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable
# Synchronization progress can be monitored like this:
lsvg rootvg | grep -i stale
STALE PVs: 1 STALE PPs: 484
lsvg rootvg | grep -i stale
STALE PVs: 1 STALE PPs: 478
# Finally, check list of boot devices
bootlist -m normal -o
hdisk0 blv=hd5
hdisk1 blv=hd5
source: https://sites.google.com/site/syscookbook/aix/lvm-rootvg-unmirror-mirror
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