On 10/23/2017 04:44 PM, Heinz Mauelshagen wrote: > LVM snapshots are meant to be used on the user visible raid1 LVs. > You found a bug allowing it to be used on its hidden legs. > > Removing such per leg snapshot should be possible after the raid1 LV got > deactivated. Hmm. This LV is currently in use. Any chance to remove it with the raid1 LV active? Cheers, --leo > On 10/23/2017 04:19 PM, Alexander 'Leo' Bergolth wrote: >> Hi! >> >> As the raid1 check of my two-drive LV recently reported a mismatch count >>> 0, I did some forensics. >> One experiment was to create a snapshot of one leg of the mirror and try >> to mount the snapshot. This worked fine but unfortunately I cannot >> remove the snapshot now! >> >> lvm wants to remove the origin too: >> -------------------- 8< -------------------- >> # lvremove vg_test/snap_leg_0 >> Do you really want to remove active origin logical volume >> vg_test/testlv_rimage_0 with 1 snapshot(s)? [y/n]: n >> Logical volume vg_test/testlv_rimage_0 not removed. >> -------------------- 8< -------------------- >> (I have added the full history of a test setup below.) >> >> Could anyone provide a hint how to get rid of the snapshot? >> (Maybe manually using dmsetup commands and metadata backup editing?) >> >> Thanks, >> --leo >> >> -------------------- snip! -------------------- >> # lvcreate --type raid1 -m 1 -n testlv -L100m vg_test /dev/vdb /dev/vdc >> Logical volume "testlv" created. >> # lvcreate -s -L50m -n snap_leg_0 /dev/mapper/vg_test-testlv_rimage_0 >> Using default stripesize 64.00 KiB. >> Rounding up size to full physical extent 52.00 MiB >> Logical volume "snap_leg_0" created. >> >> # lvremove vg_test/snap_leg_0 >> Do you really want to remove active origin logical volume >> vg_test/testlv_rimage_0 with 1 snapshot(s)? [y/n]: n >> Logical volume vg_test/testlv_rimage_0 not removed. >> >> # lvs -a -o+devices,lv_uuid >> LV VG Attr LSize Pool Origin >> Data% Meta% Move Log Cpy%Sync Convert >> Devices LV UUID >> root vg_sys -wi-ao---- >> 5.00g >> /dev/vda2(0) >> fqp4Np-mLyL-y0OS-nufS-0hsT-7ijc-lGD9Za >> swap vg_sys -wi-ao---- >> 2.00g >> /dev/vda2(2048) >> uNG1ht-eOKQ-y8Ji-yWSU-ZkZS-ZTIe-1M82mW >> var vg_sys -wi-ao---- >> 3.00g >> /dev/vda2(1280) >> nDwCsP-vn38-6AUb-Dqer-VkLv-QHs3-CfVNCR >> snap_leg_0 vg_test swi-a-s--- 52.00m [testlv_rimage_0] >> 0.00 >> /dev/vdb(26) >> f5AXqK-lDNe-hNrO-AW7G-yFvl-ctxU-fivKQf >> testlv vg_test rwi-a-r--- >> 100.00m 100.00 >> testlv_rimage_0(0),testlv_rimage_1(0) >> Av5Y8Z-NBTH-tfN2-hCbW-Sur0-ebGU-SHBlsk >> [testlv_rimage_0] vg_test owi-aor--- >> 100.00m >> /dev/vdb(1) >> OJyEep-Lgfm-B20o-4rfl-d38O-QByz-8oBa5z >> [testlv_rimage_1] vg_test iwi-aor--- >> 100.00m >> /dev/vdc(1) >> J4AP4p-Mhfo-4oPn-SOFP-CGAi-riyL-CFr1fk >> [testlv_rmeta_0] vg_test ewi-aor--- >> 4.00m >> /dev/vdb(0) >> Hgd58x-5Z2C-phkD-cIvl-KbPB-UWPz-THyZ3h >> [testlv_rmeta_1] vg_test ewi-aor--- >> 4.00m >> /dev/vdc(0) >> mvehrT-Ofci-nWpm-A43m-iBpl-YW1U-Z1Z9x4 >> >> # lvremove --select lv_uuid=f5AXqK-lDNe-hNrO-AW7G-yFvl-ctxU-fivKQf >> Do you really want to remove active origin logical volume >> vg_test/testlv_rimage_0 with 1 snapshot(s)? [y/n]: n >> Logical volume vg_test/testlv_rimage_0 not removed. >> -------------------- snip! -------------------- >> >> > -- e-mail ::: Leo.Bergolth (at) wu.ac.at fax ::: +43-1-31336-906050 location ::: IT-Services | Vienna University of Economics | Austria _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
