Cannot access logical volume (open count=1)
I'm truly sorry to bother the developers' list with this question, but I've searched and can't find an ansewr that works. A system crash seems to have corrupted something in my fedora system. I boot to a rescue CD and look thru LVM. The disk (sdb) has one vg and three lv's on it. Call the vg vg_xxx, the lv's are lv_boot (ext3, I believe), lv_swap (no fs) and lv_home (ext4). I can't fsck (e2fsck) lv_home or do anything else with it, LVM says it's open count=1 where the open count of the other two lv's is zero.
I can't find who has it open. /proc/mounts shows /dev/sdb1 mounted on /media/usb0, when I umount it (either by mount point or device) it disappears, but the lv still shows open, and as a result I am unable to do anything with it. lsof also shows nothing open that resembles this lv. I can inactivate the other two lvs in this vg, but not lv_home.
What can I do to fix this problem?
Check whether the LV has a partition on it.
(fdisk -l /dev/vg*/home) If so, use kpartx -dvv
to close it.
Quoted 2 lines
The disk (sdb) has one vg and three lv's on it
/proc/mountsshows/dev/sdb1mounted
If /dev/sdb1 is mounted, does that mean there's
a /dev/sdb2 which is a PV?
Signature · 16 lines
Ray Morris [email protected] Strongbox - The next generation in site security: http://www.bettercgi.com/strongbox/ Throttlebox - Intelligent Bandwidth Control http://www.bettercgi.com/throttlebox/ Strongbox / Throttlebox affiliate program: http://www.bettercgi.com/affiliates/user/register.php On Thu, 10 Feb 2011 16:14:22 -0500
Quoted 24 lines · Peter Flass
I'm truly sorry to bother the developers' list with this question, but I've searched and can't find an ansewr that works. A system crash seems to have corrupted something in my fedora system. I boot to a rescue CD and look thru LVM. The disk (sdb) has one vg and three lv's on it. Call the vg
vg_xxx, the lv's arelv_boot(ext3, I believe),lv_swap(no fs) andlv_home(ext4). I can't fsck (e2fsck)lv_homeor do anything else with it, LVM says it's open count=1 where the open count of the other two lv's is zero.I can't find who has it open.
/proc/mountsshows/dev/sdb1mounted on /media/usb0, when I umount it (either by mount point or device) it disappears, but the lv still shows open, and as a result I am unable to do anything with it. lsof also shows nothing open that resembles this lv. I can inactivate the other two lvs in this vg, but notlv_home.What can I do to fix this problem?
_______________________________________________
linux-lvm mailing list
[email protected]
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
I'm learning as I go here, I had never heard of Linux LVM until yesterday. This is a plain vanilla fedora installation. /dev/sdb2 contains the root and swap logical volumes. /dev/sdb1 is home. kpartx -a /dev/sdb creates /dev/sdb1 and /dev/sdb2, and kpartx -d /dev/sdb deletes both of them. Neither state made a bit of difference as far as accessing 'home'.
Pvscan shows one pv: /dev/sdb2.
BTW, I forgot to mention that I'm booting from the latest Ubuntu rescure remix CD (10.10). My Fedora CD won't boot - it loops during boot. Someone suggested Knoppix, but that loops also.
Quoted 8 lines · Ray Morris
Check whether the LV has a partition on it.
(fdisk -l/dev/vg*/home) If so, use kpartx -dvv
to close it.Quoted 2 lines
The disk (sdb) has one vg and three lv's on it
/proc/mountsshows/dev/sdb1mountedIf
/dev/sdb1is mounted, does that mean there's
a/dev/sdb2which is a PV?
Quoted 9 lines · Peter Flass
I'm truly sorry to bother the developers' list with this question, but I've searched and can't find an ansewr that works. A system crash seems to have corrupted something in my fedora system. I boot to a rescue CD and look thru LVM. The disk (sdb) has one vg and three lv's on it. Call the vg
vg_xxx, the lv's arelv_boot(ext3, I believe),lv_swap(no fs) andlv_home(ext4). I can't fsck (e2fsck)lv_homeor do anything else with it, LVM says it's open count=1 where the open count of the other two lv's is zero.
Quoted 7 lines
I can't find who has it open.
/proc/mountsshows/dev/sdb1mounted on /media/usb0, when I umount it (either by mount point or device) it disappears, but the lv still shows open, and as a result I am unable to do anything with it. lsof also shows nothing open that resembles this lv. I can inactivate the other two lvs in this vg, but notlv_home.What can I do to fix this problem?
What does "dmsetup ls --tree" look like?
E.g.:
$ sudo dmsetup ls --tree
tvg0-l0 (253:7)
└─ (7:1)
bmr_vg1-swap (253:4)
└─ (9:1)
luks-ca3de7ff-5487-4e9b-ac2b-846efc71b2e2 (253:5)
└─bmr_vg0-data (253:2)
└─ (9:2)
bmr_vg0-var (253:1)
└─ (9:2)
luks-a48853af-19d8-4965-a346-d82ae4672b66 (253:6)
└─bmr_vg0-home (253:3)
└─ (9:2)
bmr_vg0-root (253:0)
└─ (9:2)Regards,
Bryn.