I can't see the problem on my FC16 servers; all of which use md mirroring and lvm2. However they were all upgraded via yum distro-sync from FC15, FC14 and were all fresh installed as FC13, from memory. Perhaps that has some bearing on it. Below is a bunch of tests I just ran on one of them; fsck r/o, fsck rw/w, mount r/o, mount r/w; all good. -- # df Filesystem 1K-blocks Used Available Use% Mounted on rootfs 27354712K 4680956K 21302416K 19% / devtmpfs 504932K 4K 504928K 1% /dev tmpfs 513108K 0K 513108K 0% /dev/shm /dev/mapper/VolGroup00-LogVol01 27354712K 4680956K 21302416K 19% / tmpfs 513108K 40504K 472604K 8% /run tmpfs 513108K 0K 513108K 0% /sys/fs/cgroup tmpfs 513108K 0K 513108K 0% /media /dev/md0 196877K 73096K 113542K 40% /boot # mdadm --detail /dev/md1 /dev/md1: Version : 1.1 Creation Time : Fri Sep 16 08:30:27 2011 Raid Level : raid1 Array Size : 35838908 (34.18 GiB 36.70 GB) Used Dev Size : 35838908 (34.18 GiB 36.70 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Wed Apr 11 01:48:37 2012 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Name : hostname.domain:1 (local to host hostname.domain) UUID : a2b3dacc:8163523e:20813db4:2b122e3d Events : 7261 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 1 8 17 1 active sync /dev/sdb1 # pvdisplay --- Physical volume --- PV Name /dev/md1 VG Name VolGroup00 PV Size 34.18 GiB / not usable 22.93 MiB Allocatable yes PE Size 32.00 MiB Total PE 1093 Free PE 128 Allocated PE 965 PV UUID d2CXHD-Aumo-shdQ-p8Bm-ZpQz-7i1T-5ZqlM1 # lvdisplay --- Logical volume --- LV Name /dev/VolGroup00/LogVol01 VG Name VolGroup00 LV UUID pHt4NT-V3fk-VyPf-dMqu-yIwC-nJHJ-TLKeKu LV Write Access read/write LV Status available # open 1 LV Size 26.16 GiB Current LE 837 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Name /dev/VolGroup00/LogVol00 VG Name VolGroup00 LV UUID cR4csQ-C2vd-NBuq-mzG2-VYrp-NapC-M85fmb LV Write Access read/write LV Status available # open 2 LV Size 4.00 GiB Current LE 128 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 # lvcreate -l 100%FREE -s -n /dev/VolGroup00/LogVol01-snap /dev/VolGroup00/LogVol01 Logical volume "LogVol01-snap" created # lvdisplay --- Logical volume --- LV Name /dev/VolGroup00/LogVol01 VG Name VolGroup00 LV UUID pHt4NT-V3fk-VyPf-dMqu-yIwC-nJHJ-TLKeKu LV Write Access read/write LV snapshot status source of /dev/VolGroup00/LogVol01-snap [active] LV Status available # open 1 LV Size 26.16 GiB Current LE 837 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Name /dev/VolGroup00/LogVol00 VG Name VolGroup00 LV UUID cR4csQ-C2vd-NBuq-mzG2-VYrp-NapC-M85fmb LV Write Access read/write LV Status available # open 2 LV Size 4.00 GiB Current LE 128 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 --- Logical volume --- LV Name /dev/VolGroup00/LogVol01-snap VG Name VolGroup00 LV UUID KjW4nK-EZIk-u80Y-vNbJ-0WoG-HfWS-fmBq3X LV Write Access read/write LV snapshot status active destination for /dev/VolGroup00/LogVol01 LV Status available # open 0 LV Size 26.16 GiB Current LE 837 COW-table size 4.00 GiB COW-table LE 128 Allocated to snapshot 0.00% Snapshot chunk size 4.00 KiB Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 # fsck -n /dev/VolGroup00/LogVol01-snap fsck from util-linux 2.20.1 e2fsck 1.41.14 (22-Dec-2010) /dev/mapper/VolGroup00-LogVol01--snap: clean, 166035/1716960 files, 1187687/6856704 blocks # fsck -n /dev/VolGroup00/LogVol01-snap fsck from util-linux 2.20.1 e2fsck 1.41.14 (22-Dec-2010) /dev/mapper/VolGroup00-LogVol01--snap: clean, 166035/1716960 files, 1187687/6856704 blocks # fsck -n /dev/VolGroup00/LogVol01-snap fsck from util-linux 2.20.1 e2fsck 1.41.14 (22-Dec-2010) /dev/mapper/VolGroup00-LogVol01--snap: clean, 166035/1716960 files, 1187687/6856704 blocks # fsck /dev/VolGroup00/LogVol01-snap fsck from util-linux 2.20.1 e2fsck 1.41.14 (22-Dec-2010) Clearing orphaned inode 926467 (uid=0, gid=0, mode=0100755, size=64684) Clearing orphaned inode 924630 (uid=0, gid=0, mode=0100755, size=36784) Clearing orphaned inode 1048220 (uid=0, gid=0, mode=0100755, size=195416) Clearing orphaned inode 1180996 (uid=0, gid=0, mode=0100755, size=368404) Clearing orphaned inode 920626 (uid=0, gid=0, mode=0100755, size=934428) Clearing orphaned inode 1047692 (uid=0, gid=0, mode=0100755, size=11400) Clearing orphaned inode 924628 (uid=0, gid=0, mode=0100755, size=34328) Clearing orphaned inode 1047726 (uid=0, gid=0, mode=0100755, size=64448) Clearing orphaned inode 1047669 (uid=0, gid=0, mode=0100755, size=113736) Clearing orphaned inode 1047691 (uid=0, gid=0, mode=0100755, size=56588) Clearing orphaned inode 1047718 (uid=0, gid=0, mode=0100755, size=95800) /dev/mapper/VolGroup00-LogVol01--snap: clean, 166024/1716960 files, 1187201/6856704 blocks # fsck /dev/VolGroup00/LogVol01-snap fsck from util-linux 2.20.1 e2fsck 1.41.14 (22-Dec-2010) /dev/mapper/VolGroup00-LogVol01--snap: clean, 166024/1716960 files, 1187201/6856704 blocks # fsck /dev/VolGroup00/LogVol01-snap fsck from util-linux 2.20.1 e2fsck 1.41.14 (22-Dec-2010) /dev/mapper/VolGroup00-LogVol01--snap: clean, 166024/1716960 files, 1187201/6856704 blocks # mkdir /j # mount -r /dev/VolGroup00/LogVol01-snap /j # ll /j total 164K dr-xr-xr-x. 26 root root 4096 Mar 25 22:26 . dr-xr-xr-x. 27 root root 4096 Apr 11 00:03 .. -rw-r--r--. 1 root root 22345 Mar 25 22:26 .readahead dr-xr-xr-x. 2 root root 4096 Mar 26 03:25 bin drwxr-xr-x. 2 root root 4096 Sep 16 2011 boot drwxr-xr-x. 2 root root 4096 Mar 3 2011 cgroup drwxr-xr-x. 2 root root 4096 Sep 16 2011 dev drwxr-xr-x. 96 root root 12288 Apr 4 03:31 etc drwxr-xr-x. 11 root root 4096 Jul 29 2011 home drwxr-xr-x. 2 root root 4096 Sep 16 2011 import dr-xr-xr-x. 19 root root 12288 Mar 26 03:25 lib drwx------. 2 root root 16384 Sep 16 2011 lost+found drwxr-xr-x. 2 root root 4096 May 18 2011 media drwxr-xr-x. 2 root root 4096 Jul 29 2011 mnt drwxr-xr-x. 4 root root 4096 Jul 29 2011 opt drwxr-xr-x. 2 root root 4096 Sep 16 2011 proc dr-xr-x---. 3 root root 4096 Jul 29 2011 root drwxr-xr-x. 19 root root 4096 Sep 16 2011 run dr-xr-xr-x. 2 root root 12288 Mar 26 03:25 sbin drwxr-xr-x. 2 root root 4096 Sep 16 2011 selinux drwxr-xr-x. 2 root root 4096 Jul 29 2011 srv drwxr-xr-x. 2 root root 4096 Sep 16 2011 sys drwxrwxrwt. 15 root root 4096 Apr 11 00:01 tmp drwxr-xr-x. 2 root root 4096 Sep 16 2011 tmp-build drwxr-xr-x. 12 root root 4096 Mar 19 03:55 usr drwxr-xr-x. 16 root root 4096 Mar 19 03:55 var # touch /j/kkk touch: cannot touch `/j/kkk': Read-only file system # umount /j # fsck /dev/VolGroup00/LogVol01-snap fsck from util-linux 2.20.1 e2fsck 1.41.14 (22-Dec-2010) /dev/mapper/VolGroup00-LogVol01--snap: clean, 166024/1716960 files, 1187201/6856704 blocks # lvdisplay --- Logical volume --- LV Name /dev/VolGroup00/LogVol01 VG Name VolGroup00 LV UUID pHt4NT-V3fk-VyPf-dMqu-yIwC-nJHJ-TLKeKu LV Write Access read/write LV snapshot status source of /dev/VolGroup00/LogVol01-snap [active] LV Status available # open 1 LV Size 26.16 GiB Current LE 837 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Name /dev/VolGroup00/LogVol00 VG Name VolGroup00 LV UUID cR4csQ-C2vd-NBuq-mzG2-VYrp-NapC-M85fmb LV Write Access read/write LV Status available # open 2 LV Size 4.00 GiB Current LE 128 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 --- Logical volume --- LV Name /dev/VolGroup00/LogVol01-snap VG Name VolGroup00 LV UUID KjW4nK-EZIk-u80Y-vNbJ-0WoG-HfWS-fmBq3X LV Write Access read/write LV snapshot status active destination for /dev/VolGroup00/LogVol01 LV Status available # open 0 LV Size 26.16 GiB Current LE 837 COW-table size 4.00 GiB COW-table LE 128 Allocated to snapshot 0.03% Snapshot chunk size 4.00 KiB Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 # lvremove -f /dev/VolGroup00/LogVol01-snap Logical volume "LogVol01-snap" successfully removed # lvremove -f /dev/VolGroup00/LogVol01-snap One or more specified logical volume(s) not found. # lvdisplay --- Logical volume --- LV Name /dev/VolGroup00/LogVol01 VG Name VolGroup00 LV UUID pHt4NT-V3fk-VyPf-dMqu-yIwC-nJHJ-TLKeKu LV Write Access read/write LV Status available # open 1 LV Size 26.16 GiB Current LE 837 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Name /dev/VolGroup00/LogVol00 VG Name VolGroup00 LV UUID cR4csQ-C2vd-NBuq-mzG2-VYrp-NapC-M85fmb LV Write Access read/write LV Status available # open 2 LV Size 4.00 GiB Current LE 128 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 # lvcreate -l 100%FREE -s -n /dev/VolGroup00/LogVol01-snap /dev/VolGroup00/LogVol01 Logical volume "LogVol01-snap" created # fsck /dev/VolGroup00/LogVol01-snap fsck from util-linux 2.20.1 e2fsck 1.41.14 (22-Dec-2010) Clearing orphaned inode 926467 (uid=0, gid=0, mode=0100755, size=64684) Clearing orphaned inode 924630 (uid=0, gid=0, mode=0100755, size=36784) Clearing orphaned inode 1048220 (uid=0, gid=0, mode=0100755, size=195416) Clearing orphaned inode 1180996 (uid=0, gid=0, mode=0100755, size=368404) Clearing orphaned inode 920626 (uid=0, gid=0, mode=0100755, size=934428) Clearing orphaned inode 1047692 (uid=0, gid=0, mode=0100755, size=11400) Clearing orphaned inode 924628 (uid=0, gid=0, mode=0100755, size=34328) Clearing orphaned inode 1047726 (uid=0, gid=0, mode=0100755, size=64448) Clearing orphaned inode 1047669 (uid=0, gid=0, mode=0100755, size=113736) Clearing orphaned inode 1047691 (uid=0, gid=0, mode=0100755, size=56588) Clearing orphaned inode 1047718 (uid=0, gid=0, mode=0100755, size=95800) /dev/mapper/VolGroup00-LogVol01--snap: clean, 166027/1716960 files, 1187211/6856704 blocks # fsck /dev/VolGroup00/LogVol01-snap fsck from util-linux 2.20.1 e2fsck 1.41.14 (22-Dec-2010) /dev/mapper/VolGroup00-LogVol01--snap: clean, 166027/1716960 files, 1187211/6856704 blocks # mount /dev/VolGroup00/LogVol01-snap /j # ll /j total 168K dr-xr-xr-x. 27 root root 4096 Apr 11 00:05 . dr-xr-xr-x. 27 root root 4096 Apr 11 00:05 .. -rw-r--r--. 1 root root 22345 Mar 25 22:26 .readahead dr-xr-xr-x. 2 root root 4096 Mar 26 03:25 bin drwxr-xr-x. 2 root root 4096 Sep 16 2011 boot drwxr-xr-x. 2 root root 4096 Mar 3 2011 cgroup drwxr-xr-x. 2 root root 4096 Sep 16 2011 dev drwxr-xr-x. 96 root root 12288 Apr 4 03:31 etc drwxr-xr-x. 11 root root 4096 Jul 29 2011 home drwxr-xr-x. 2 root root 4096 Sep 16 2011 import drwxr-xr-x. 2 root root 4096 Apr 11 00:03 j dr-xr-xr-x. 19 root root 12288 Mar 26 03:25 lib drwx------. 2 root root 16384 Sep 16 2011 lost+found drwxr-xr-x. 2 root root 4096 May 18 2011 media drwxr-xr-x. 2 root root 4096 Jul 29 2011 mnt drwxr-xr-x. 4 root root 4096 Jul 29 2011 opt drwxr-xr-x. 2 root root 4096 Sep 16 2011 proc dr-xr-x---. 3 root root 4096 Jul 29 2011 root drwxr-xr-x. 19 root root 4096 Sep 16 2011 run dr-xr-xr-x. 2 root root 12288 Mar 26 03:25 sbin drwxr-xr-x. 2 root root 4096 Sep 16 2011 selinux drwxr-xr-x. 2 root root 4096 Jul 29 2011 srv drwxr-xr-x. 2 root root 4096 Sep 16 2011 sys drwxrwxrwt. 15 root root 4096 Apr 11 00:07 tmp drwxr-xr-x. 2 root root 4096 Sep 16 2011 tmp-build drwxr-xr-x. 12 root root 4096 Mar 19 03:55 usr drwxr-xr-x. 16 root root 4096 Mar 19 03:55 var # touch /j/kkk # ll /j/kkk -rw-r--r--. 1 root root 0 Apr 11 00:08 /j/kkk # umount /j # mount /dev/VolGroup00/LogVol01-snap /j # ll /j/kkk -rw-r--r--. 1 root root 0 Apr 11 00:08 /j/kkk # umount /j # rmdir /j # lvremove -f /dev/VolGroup00/LogVol01-snap Logical volume "LogVol01-snap" successfully removed # !! lvremove -f /dev/VolGroup00/LogVol01-snap One or more specified logical volume(s) not found. # rpm -q lvm2 lvm2-2.02.86-6.fc16.i686 # rpm -q kernel-PAE kernel-PAE-2.6.42.9-1.fc15.i686 kernel-PAE-3.2.10-3.fc16.i686 kernel-PAE-3.3.0-4.fc16.i686 # uname -r 3.3.0-4.fc16.i686.PAE