[linux-lvm] (resend) may bug: lvconvert reports "Insufficient free space" when doing "--replace"
heming.zhao at suse.com
heming.zhao at suse.com
Mon Nov 22 07:52:12 UTC 2021
Hi Heinz,
On 11/19/21 02:18, Heinz Mauelshagen wrote:
> Hemng,
heming, not hemng.
>
> 'lvconvert --replace ..." reports the new PV does not have enough space (89 needed/49 available) to suit full replacement and rejects as replacement requires complete SubLVs to move off respective PVs.
>
> Check lsblk (or lvs -ao+devices) after the pvmove to confirm a partial move across resulting remaining allocations for leg 0 on /dev/sdh, i.e no replacement
>
pvmove can do the replace job, output from the same env.
(you could set up a env to reproduce this issue)
```
# pvmove /dev/sdh /dev/sdi
/dev/sdh: Moved: 2.50%
/dev/sdh: Moved: 100.00%
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdg 8:96 0 200M 0 disk
└─vg1-lv1_rimage_0 254:4 0 352M 0 lvm
└─vg1-lv1 254:2 0 352M 0 lvm
sdh 8:112 0 200M 0 disk
sdi 8:128 0 200M 0 disk
├─vg1-lv1_rmeta_0 254:3 0 4M 0 lvm
│ └─vg1-lv1 254:2 0 352M 0 lvm
└─vg1-lv1_rimage_0 254:4 0 352M 0 lvm
└─vg1-lv1 254:2 0 352M 0 lvm
sdj 8:144 0 200M 0 disk
├─vg1-lv1_rmeta_1 254:5 0 4M 0 lvm
│ └─vg1-lv1 254:2 0 352M 0 lvm
└─vg1-lv1_rimage_1 254:6 0 352M 0 lvm
└─vg1-lv1 254:2 0 352M 0 lvm
sdk 8:160 0 200M 0 disk
└─vg1-lv1_rimage_1 254:6 0 352M 0 lvm
└─vg1-lv1 254:2 0 352M 0 lvm
sdl 8:176 0 200M 0 disk
# lvs -ao+devices
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Devices
root system -wi-ao---- 35.00g /dev/vda2(512)
swap system -wi-ao---- 2.00g /dev/vda2(0)
lv1 vg1 rwi-a-r--- 352.00m 100.00 lv1_rimage_0(0),lv1_rimage_1(0)
[lv1_rimage_0] vg1 iwi-aor--- 352.00m /dev/sdg(0)
[lv1_rimage_0] vg1 iwi-aor--- 352.00m /dev/sdi(1)
[lv1_rimage_1] vg1 iwi-aor--- 352.00m /dev/sdj(1)
[lv1_rimage_1] vg1 iwi-aor--- 352.00m /dev/sdk(0)
[lv1_rmeta_0] vg1 ewi-aor--- 4.00m /dev/sdi(0)
[lv1_rmeta_1] vg1 ewi-aor--- 4.00m /dev/sdj(0)
```
> Use a larger PV to be able to replace.
In my view, this is a bug.
Or man page should point out lvconvert doesn't have ability to move partial PV dev(s).
>
> Best,
> Heinz
>
> On Mon, Nov 8, 2021 at 7:46 AM heming.zhao at suse.com <mailto:heming.zhao at suse.com> <heming.zhao at suse.com <mailto:heming.zhao at suse.com>> wrote:
>
> (I sent this mail some days before, it looks this mail was blocked by anti-spam system. resend it)
>
> Hello list,
>
> I may found a bug, when lv is raid1, and each leg includes more than one PV.
>
> When doing "lvconvert --replace" to replace one of the oldpv with a newpv,
> It looks lvconvert requires full raid array size for a single newpv.
>
> lvm version: 2.03.12, Reproducible steps:
>
> ```
> # vgcreate vg1 /dev/sdg /dev/sdh
> Volume group "vg1" successfully created
>
> # lvcreate -n lv1 -l 90%FREE vg1
> Logical volume "lv1" created.
>
> # vgextend vg1 /dev/sdj /dev/sdk
> Physical volume "/dev/sdj" successfully created.
> Physical volume "/dev/sdk" successfully created.
> Volume group "vg1" successfully extended
>
> # lvconvert --type raid1 vg1/lv1 /dev/sdg /dev/sdh /dev/sdj /dev/sdk
> Are you sure you want to convert linear LV vg1/lv1 to raid1 type? [y/n]: y
> Logical volume vg1/lv1 successfully converted.
>
> # lsblk
> NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
> sdg 8:96 0 200M 0 disk
> └─vg1-lv1_rimage_0 254:4 0 352M 0 lvm
> └─vg1-lv1 254:2 0 352M 0 lvm
> sdh 8:112 0 200M 0 disk
> ├─vg1-lv1_rmeta_0 254:3 0 4M 0 lvm
> │ └─vg1-lv1 254:2 0 352M 0 lvm
> └─vg1-lv1_rimage_0 254:4 0 352M 0 lvm
> └─vg1-lv1 254:2 0 352M 0 lvm
> sdi 8:128 0 200M 0 disk
> sdj 8:144 0 200M 0 disk
> ├─vg1-lv1_rmeta_1 254:5 0 4M 0 lvm
> │ └─vg1-lv1 254:2 0 352M 0 lvm
> └─vg1-lv1_rimage_1 254:6 0 352M 0 lvm
> └─vg1-lv1 254:2 0 352M 0 lvm
> sdk 8:160 0 200M 0 disk
> └─vg1-lv1_rimage_1 254:6 0 352M 0 lvm
> └─vg1-lv1 254:2 0 352M 0 lvm
> sdl 8:176 0 200M 0 disk
>
> # vgextend vg1 /dev/sdi
> Volume group "vg1" successfully extended
>
> # lvconvert --replace /dev/sdh vg1/lv1 /dev/sdi (<=== failed, should succeed)
> Insufficient free space: 89 extents needed, but only 49 available
> LV vg1/lv1 in not partial.
>
> # lvconvert --replace /dev/sdg vg1/lv1 /dev/sdi (<=== failed, should succeed)
> Insufficient free space: 89 extents needed, but only 49 available
> LV vg1/lv1 in not partial.
>
> # pvmove /dev/sdh /dev/sdi
> /dev/sdh: Moved: 2.50%
> /dev/sdh: Moved: 100.00%
> ```
>
> pvmove is workable, but I think it's a work around.
> lvconvert should run successfully with above cmds.
>
> Thanks,
> Heming
>
>
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