Hi Marian,
Thank for your helps, the patch is effective to fix this error message.
Thanks
Gang
-Original Message-
From: Marian Csontos [mailto:mcson...@redhat.com]
Sent: 2019年7月8日 16:37
To: LVM general discussion and development ; Gang He
Subject: Re: [linux-lvm] "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
>
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>
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