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Description of problem: This is basically bug 1196910 but attempted with raid volumes. resizefs does the umount and the fs reduction even though lvm raid reduction is not yet supported. SCENARIO (raid1) - [raid_fsadm_reduce_after_rename_to_previously_used] Create raid, add and mount fs, swap (rename) device names, and then attempt to resize it while online host-118.virt.lab.msp.redhat.com: lvcreate --nosync --type raid1 -m 1 -n resizeA -L 400M raid_sanity WARNING: New raid1 won't be synchronised. Don't read what you didn't write! Placing an ext on resizeA volume mkfs /dev/raid_sanity/resizeA mke2fs 1.41.12 (17-May-2010) mount /dev/raid_sanity/resizeA /mnt/resizeA host-118.virt.lab.msp.redhat.com: lvcreate --nosync --type raid1 -m 1 -n resizeB -L 400M raid_sanity WARNING: New raid1 won't be synchronised. Don't read what you didn't write! Placing an ext on resizeB volume mkfs /dev/raid_sanity/resizeB mke2fs 1.41.12 (17-May-2010) mount /dev/raid_sanity/resizeB /mnt/resizeB lvrename /dev/raid_sanity/resizeA /dev/raid_sanity/resizeC lvrename /dev/raid_sanity/resizeB /dev/raid_sanity/resizeA [root@host-118 ~]# lvs -a -o +devices LV VG Attr LSize Cpy%Sync Devices resizeA raid_sanity Rwi-aor--- 400.00m 100.00 resizeA_rimage_0(0),resizeA_rimage_1(0) [resizeA_rimage_0] raid_sanity iwi-aor--- 400.00m /dev/sde2(102) [resizeA_rimage_1] raid_sanity iwi-aor--- 400.00m /dev/sde1(102) [resizeA_rmeta_0] raid_sanity ewi-aor--- 4.00m /dev/sde2(101) [resizeA_rmeta_1] raid_sanity ewi-aor--- 4.00m /dev/sde1(101) resizeC raid_sanity Rwi-aor--- 400.00m 100.00 resizeC_rimage_0(0),resizeC_rimage_1(0) [resizeC_rimage_0] raid_sanity iwi-aor--- 400.00m /dev/sde2(1) [resizeC_rimage_1] raid_sanity iwi-aor--- 400.00m /dev/sde1(1) [resizeC_rmeta_0] raid_sanity ewi-aor--- 4.00m /dev/sde2(0) [resizeC_rmeta_1] raid_sanity ewi-aor--- 4.00m /dev/sde1(0) [root@host-118 ~]# lvreduce -r -n -f -L 200M /dev/raid_sanity/resizeA Do you want to unmount "/mnt/resizeB"? [Y|n] y fsck from util-linux-ng 2.17.2 /dev/mapper/raid_sanity-resizeA: 11/102400 files (0.0% non-contiguous), 15246/409600 blocks resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/raid_sanity-resizeA to 204800 (1k) blocks. The filesystem on /dev/mapper/raid_sanity-resizeA is now 204800 blocks long. Unable to reduce RAID LV - operation not implemented. # Filesystem is now reported as 2M, and it's additionally confusing now seeing two mounted "raid_sanity-resizeA" filesystems of differing sizes, but the user only has themselves to blame for that. [root@host-118 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_host118-lv_root 6.5G 3.2G 3.1G 51% / tmpfs 499M 0 499M 0% /dev/shm /dev/vda1 477M 34M 418M 8% /boot /dev/mapper/raid_sanity-resizeA 388M 2.3M 366M 1% /mnt/resizeA /dev/mapper/raid_sanity-resizeA 194M 1.6M 183M 1% /mnt/resizeB # LVM still reports the 400M size [root@host-118 ~]# lvs -a -o +devices LV VG Attr LSize Cpy%Sync Devices resizeA raid_sanity Rwi-aor--- 400.00m 100.00 resizeA_rimage_0(0),resizeA_rimage_1(0) [resizeA_rimage_0] raid_sanity iwi-aor--- 400.00m /dev/sde2(102) [resizeA_rimage_1] raid_sanity iwi-aor--- 400.00m /dev/sde1(102) [resizeA_rmeta_0] raid_sanity ewi-aor--- 4.00m /dev/sde2(101) [resizeA_rmeta_1] raid_sanity ewi-aor--- 4.00m /dev/sde1(101) resizeC raid_sanity Rwi-aor--- 400.00m 100.00 resizeC_rimage_0(0),resizeC_rimage_1(0) [resizeC_rimage_0] raid_sanity iwi-aor--- 400.00m /dev/sde2(1) [resizeC_rimage_1] raid_sanity iwi-aor--- 400.00m /dev/sde1(1) [resizeC_rmeta_0] raid_sanity ewi-aor--- 4.00m /dev/sde2(0) [resizeC_rmeta_1] raid_sanity ewi-aor--- 4.00m /dev/sde1(0) Version-Release number of selected component (if applicable): 2.6.32-633.el6.x86_64 lvm2-2.02.143-3.el6 BUILT: Tue Mar 22 09:26:10 CDT 2016 lvm2-libs-2.02.143-3.el6 BUILT: Tue Mar 22 09:26:10 CDT 2016 lvm2-cluster-2.02.143-3.el6 BUILT: Tue Mar 22 09:26:10 CDT 2016 udev-147-2.72.el6 BUILT: Tue Mar 1 06:14:05 CST 2016 device-mapper-1.02.117-3.el6 BUILT: Tue Mar 22 09:26:10 CDT 2016 device-mapper-libs-1.02.117-3.el6 BUILT: Tue Mar 22 09:26:10 CDT 2016 device-mapper-event-1.02.117-3.el6 BUILT: Tue Mar 22 09:26:10 CDT 2016 device-mapper-event-libs-1.02.117-3.el6 BUILT: Tue Mar 22 09:26:10 CDT 2016 device-mapper-persistent-data-0.6.2-0.1.rc7.el6 BUILT: Tue Mar 22 08:58:09 CDT 2016 cmirror-2.02.143-3.el6 BUILT: Tue Mar 22 09:26:10 CDT 2016