HELP! Questions at the end. I am providing some history.
This volume group is built on md devices. I needed to expand the space.
Originally there were two in the volume group (md0 is for boot):
[root@cmslax etc]# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
Event: 3
md0 : active raid1 sdb2[1] sda2[0]
40064 blocks [2/2] [UU]
md1 : active raid1 sdb5[1] sda5[0]
17687424 blocks [2/2] [UU]
md2 : active raid1 sdb6[1] sda6[0]
17775808 blocks [2/2] [UU]
unused devices: <none>
I added drive sdc, allocated 72G non LVM partition, and made a full rsync
backup before beginning. Then I migrated the sdb mirror copies to sdc
and created md3 and md4:
[root@cmslax etc]# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
Event: 15
md4 : active raid1 sdb6[1] sdc8[0]
17775808 blocks [2/2] [UU]
md3 : active raid1 sdc7[1] sdb5[0]
17687424 blocks [2/2] [UU]
md0 : active raid1 sdb2[1] sda2[0]
40064 blocks [2/2] [UU]
md1 : active raid1 sdc5[1] sda5[0]
17687424 blocks [2/2] [UU]
md2 : active raid1 sdc6[1] sda6[0]
17775808 blocks [2/2] [UU]
unused devices: <none>
The problem is with md3. Since I left sdb5 as device 0, its data took
precedence, thus creating a duplicate PV UUID. So, I ran pvcreate
with the "I really really mean it option" to wipe md3 (I learned my lesson
with md4). BUT, when I extended the VG, pvdisplay shows this:
[root@cmslax sbin]# pvdisplay /dev/md3
--- Physical volume ---
PV Name /dev/md3
VG Name rootvg
PV Size 16.87 GB [35374848 secs] / NOT usable 32.19 MB [LVM: 130 KB]
PV# 3
PV Status NOT available
Allocatable yes
Cur LV 1
PE Size (KByte) 32768
Total PE 538
Free PE 538
Allocated PE 0
PV UUID YfvIpi-x3Cg-xKrR-j1T2-Gutz-u1tp-sl8t01
Then, I allocated a LV 'lvtest'. This succeeded. But md3 still
showed "NOT available". Huh? Now I can't remove lvtest, and vgscan
gets an error. Did pvcreate do something to rootvg? Worse, vgscan
wiped lvmtab. I think I shouldn't have run vgscan... So I restored
lvmtab (just has one vg: rootvg) and /etc/lvmtab.d from my backup.
Now, vgdisplay and friends work again. but vgck gets the same error,
and I still can't remove lvtest, and can't reduce the VG:
[root@cmslax sbin]# lvremove /dev/rootvg/lvtest
lvremove -- do you really want to remove "/dev/rootvg/lvtest"? [y/n]: y
lvremove -- ERROR "lv_release(): LV number" releasing logical volume "/dev/rootvg/lvtest"
[root@cmslax sbin]# vgreduce rootvg /dev/md3
vgreduce -- physical volume "/dev/md3" doesn't belong to volume group "rootvg"
[root@cmslax sbin]# vgck
vgck -- VGDA of "rootvg" in lvmtab is consistent
vgck -- ERROR "vg_read_with_pv_and_lv(): current PV" reading data of volume group "rootvg" from physical volume(s)
vgck -- please DON'T run vgscan prior to vgcfgrestore
[root@cmslax etc]# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- WARNING: physical volume "/dev/sda5" belongs to a meta device
pvscan -- WARNING: physical volume "/dev/sda6" belongs to a meta device
pvscan -- WARNING: physical volume "/dev/sdb5" belongs to a meta device
pvscan -- WARNING: physical volume "/dev/sdc5" belongs to a meta device
pvscan -- WARNING: physical volume "/dev/sdc6" belongs to a meta device
pvscan -- ACTIVE PV "/dev/md1" of VG "rootvg" [16.81 GB / 0 free]
pvscan -- ACTIVE PV "/dev/md2" of VG "rootvg" [16.91 GB / 0 free]
pvscan -- ACTIVE PV "/dev/md3" of VG "rootvg" [16.81 GB / 15.03 GB
free]
pvscan -- total: 8 [50.69 GB] / in use: 8 [50.69 GB] / in no VG: 0 [0]
[root@cmslax etc]# pvdisplay /dev/md3
--- Physical volume ---
PV Name /dev/md3
VG Name rootvg
PV Size 16.87 GB [35374848 secs] / NOT usable 32.19 MB [LVM: 130 KB]
PV# 3
PV Status NOT available
Allocatable yes
Cur LV 1
PE Size (KByte) 32768
Total PE 538
Free PE 481
Allocated PE 57
PV UUID YfvIpi-x3Cg-xKrR-j1T2-Gutz-u1tp-sl8t01
[root@cmslax sbin]# pvdata /dev/md3
--- Physical volume ---
PV Name /dev/md3
VG Name rootvg
PV Size 16.87 GB [35374848 secs] / NOT usable 32.19 MB [LVM: 130 KB]
PV# 3
PV Status NOT available
Allocatable yes
Cur LV 1
PE Size (KByte) 32768
Total PE 538
Free PE 481
Allocated PE 57
PV UUID YfvIpi-x3Cg-xKrR-j1T2-Gutz-u1tp-sl8t01
--- Volume group ---
VG Name
VG Access read/write
VG Status NOT available/resizable
VG # 0
MAX LV 256
Cur LV 11
Open LV 0
MAX LV Size 2 TB
Max PV 256
Cur PV 3
Act PV 3
VG Size 50.53 GB
PE Size 32 MB
Total PE 1617
Alloc PE / Size 1136 / 35.50 GB
Free PE / Size 481 / 15.03 GB
VG UUID L5TG3Z-r4TS-P4Qe-hLmX-jbSz-VN9l-Pd1QHq
--- List of logical volumes ---
pvdata -- logical volume "/dev/rootvg/lv00" at offset 0
pvdata -- logical volume "/dev/rootvg/lv01" at offset 1
pvdata -- logical volume "/dev/rootvg/lv02" at offset 2
pvdata -- logical volume "/dev/rootvg/lv03" at offset 3
pvdata -- logical volume "/dev/rootvg/lv04" at offset 4
pvdata -- logical volume "/dev/rootvg/lv05" at offset 5
pvdata -- logical volume "/dev/rootvg/lv06" at offset 6
pvdata -- logical volume "/dev/rootvg/lv07" at offset 7
pvdata -- logical volume "/dev/rootvg/lvtest" at offset 8
pvdata -- logical volume "/dev/rootvg/lv09" at offset 9
pvdata -- logical volume "/dev/rootvg/lv10" at offset 10
pvdata -- logical volume struct at offset 11 is empty
...
pvdata -- logical volume struct at offset 255 is empty
--- List of physical volume UUIDs ---
001: e19MZP-dAoA-8I7P-2S6l-eUux-f1wI-XrlW23
002: NTadnL-TAQJ-XLtL-i1nD-Zo7w-q5Ll-6k5CgN
003: YfvIpi-x3Cg-xKrR-j1T2-Gutz-u1tp-sl8t01
I looks like vgextend didn't actually mark md3!
I have a feeling the system won't boot in this situation, since vgscan won't
run, and this is a remote system on the other side of the continent, so we
don't want to go the backup route. (There are no knowlegable users, but I
think I can make a grub entry that boots to the backup partition and change
fstab and mtab - anything else I forgot?)
vgcfgrestore says it "doesn't restore LV data". Does that mean it wipes
all LVs? Or would it wipe lvtest and md3 from rootvg?
--
Stuart D. Gathman <stuart@bmsi.com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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