Hi Marian, Thank for your helps, the patch is effective to fix this error message. Thanks Gang -----Original Message----- From: Marian Csontos [mailto:mcsontos@xxxxxxxxxx] Sent: 2019年7月8日 16:37 To: LVM general discussion and development <linux-lvm@xxxxxxxxxx>; Gang He <GHe@xxxxxxxx> Subject: Re: "Unknown feature in status" message when running lvs/lvdisplay against cached LVs On 7/5/19 11:20 AM, Gang He wrote: > Hi Guys, > > I uses lvm2-2.02.180, I got an error message when running lvs/lvdisplay against cached LVs. > e.g. > linux-v5ay:~ # lvs > Unknown feature in status: 8 1324/8192 128 341/654272 129 151 225 1644 0 341 0 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 2048 smq 0 rw - > LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert > home system -wi-ao---- 17.99g > root system Cwi-aoC--- 20.00g [lvc_root] [root_corig] 0.05 16.16 0.00 > swap system -wi-ao---- 2.00g You need this patch: https://sourceware.org/git/?p=lvm2.git;a=commit;h=adf9bf80a32500b45b37eb24b98fa7c2c933019e Kernel introduced a new feature which is not recognized by lvm versions released before the kernel (which is anything up to latest 2.02.185). This will be included in the next lvm release. -- Marian > > The bug can be reproduced stably with the below steps. > Have a (virtual) machine with 2 disk drives Install os with LVM as > root volume Then, add the second disk after os is installed. > # pvcreate /dev/sdb > # vgextend system /dev/sdb > # lvcreate --type cache-pool -l 100%FREE -n lvc_root system /dev/sdb # > lvconvert --type cache --cachepool system/lvc_root system/root then > run `lvs` or `lvdisplay` command to trigger the issue > > > Thanks > Gang > > _______________________________________________ > linux-lvm mailing list > linux-lvm@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
