[linux-lvm] mirror volume split

[Anatoly Pugachev]

to reply myself,

probably bug in md raid1 implementation of lvm2, since it's quite a new
code in 2014 lvm2.

Fixed with help from irc #lvm, thanks to kabi :

ithaqua:/mnt # lvremove vg1/split1
Do you really want to remove active logical volume split1? [y/n]: y
  Logical volume "split1" successfully removed
ithaqua:/mnt # lvremove vg1/gatewayVol_rmeta_1
Do you really want to remove active logical volume gatewayVol_rmeta_1?
[y/n]: y
  Logical volume "gatewayVol_rmeta_1" successfully removed
ithaqua:/mnt # lvremove vg1/gatewayVol_rmeta_0
Do you really want to remove active logical volume gatewayVol_rmeta_0?
[y/n]: y
  Logical volume "gatewayVol_rmeta_0" successfully removed
ithaqua:/mnt # lvremove vg1/gatewayVol_rimage_1
  Logical volume "gatewayVol_rimage_1" successfully removed

ithaqua:/mnt # lvconvert -m1 vg1/gatewayVol
  device-mapper: create ioctl on vg1-gatewayVol_rimage_0 failed: Device or
resource busy
  Failed to lock logical volume vg1/gatewayVol.

ithaqua:/mnt # lvs
  LV                  VG   Attr       LSize   Pool Origin Data%  Meta%
Move Log Cpy%Sync Convert
  gatewayVol          vg1  -wi-ao----
8.00g
  gatewayVol_rimage_1 vg1  -wi-------
8.00g
  gatewayVol_rmeta_0  vg1  -wi-a-----
4.00m
  gatewayVol_rmeta_1  vg1  -wi-------   4.00m


ithaqua:/mnt # lvremove vg1/gatewayVol_rmeta_1
Do you really want to remove active logical volume gatewayVol_rmeta_1?
[y/n]: y
  Logical volume "gatewayVol_rmeta_1" successfully removed
ithaqua:/mnt # lvremove vg1/gatewayVol_rmeta_0
Do you really want to remove active logical volume gatewayVol_rmeta_0?
[y/n]: y
  Logical volume "gatewayVol_rmeta_0" successfully removed
ithaqua:/mnt # lvremove vg1/gatewayVol_rimage_1
  Logical volume "gatewayVol_rimage_1" successfully removed

ithaqua:/mnt # lvs
  LV                  VG   Attr       LSize   Pool Origin Data%  Meta%
Move Log Cpy%Sync Convert
  gatewayVol          vg1  -wi-ao----   8.00g

ithaqua:/mnt # dmsetup table | grep gate
vg1-gatewayVol_rimage_0: 0 16777216 linear 8:5 714926080
vg1-gatewayVol: 0 16777216 linear 8:5 714926080

ithaqua:/mnt # dmsetup info -c | grep gate
vg1-gatewayVol_rimage_0          254  52 L--w    0    1      0
LVM-BynKRpbJnegQy2RbeN9sxON1zKghQ7Fw2Q4aqEReJHtPNxXFyPyaXz040c5y3ZWA
vg1-gatewayVol                   254  55 L--w    1    1      0
LVM-BynKRpbJnegQy2RbeN9sxON1zKghQ7FwMYUKRXvsN40JWStnPz6PSjxrlg0QxmCb

ithaqua:/mnt # dmsetup ls --tree
vg1-gatewayVol_rimage_0 (254:52)
 L- (8:5)
vg1-gatewayVol (254:55)
 L- (8:5)

ithaqua:/mnt # dmsetup remove vg1-gatewayVol_rimage_0
ithaqua:/mnt # dmsetup info -c | grep gate
vg1-gatewayVol                   254  55 L--w    1    1      0
LVM-BynKRpbJnegQy2RbeN9sxON1zKghQ7FwMYUKRXvsN40JWStnPz6PSjxrlg0QxmCb
ithaqua:/mnt # dmsetup table | grep gate
vg1-gatewayVol: 0 16777216 linear 8:5 714926080


ithaqua:/mnt # lvconvert -m1 vg1/gatewayVol
ithaqua:/mnt # lvs -a | grep gate
  LV                  VG   Attr       LSize   Pool Origin Data%  Meta%
Move Log Cpy%Sync Convert
  gatewayVol                     vg1  rwi-aor---
8.00g                                    10.84
  [gatewayVol_rimage_0]          vg1  Iwi-aor---
8.00g
  [gatewayVol_rimage_1]          vg1  Iwi-aor---
8.00g
  [gatewayVol_rmeta_0]           vg1  ewi-aor---
4.00m
  [gatewayVol_rmeta_1]           vg1  ewi-aor---   4.00m




On Thu, Oct 8, 2015 at 12:17 PM, Anatoly Pugachev <matorola at gmail.com>
wrote:

> Hello!
>
> Trying to split one of mirror volumes :
>
> # lvs
>   LV                  VG   Attr       LSize   Pool Origin Data%  Meta%
> Move Log Cpy%Sync Convert
>   gatewayVol          vg1  rwi-aor---
> 8.00g                                    100.00
>
> # lvconvert --splitmirrors 1 -n split1 vg1/gatewayVol
> # lvs
>   LV                  VG   Attr       LSize   Pool Origin Data%  Meta%
> Move Log Cpy%Sync Convert
>   gatewayVol          vg1  -wi-ao----   8.00g
>   split1              vg1  -wi-a-----   8.00g
>
> converting original volume back to mirror configuration, leaving split1
> volume intact:
>
> # lvconvert -m1 vg1/gatewayVol
>   device-mapper: create ioctl on vg1-gatewayVol_rimage_1 failed: Device or
> resource busy
>   Failed to lock logical volume vg1/gatewayVol.
>
> # lvs
>   LV                  VG   Attr       LSize   Pool Origin Data%  Meta%
> Move Log Cpy%Sync Convert
>   gatewayVol          vg1  -wi-ao----   8.00g
>   gatewayVol_rimage_1 vg1  -wi-------   8.00g
>   gatewayVol_rmeta_0  vg1  -wi-a-----   4.00m
>   gatewayVol_rmeta_1  vg1  -wi-a-----   4.00m
>   split1              vg1  -wi-a-----   8.00g
>
> So, what I should do now? What is rimage* and rmeta* ? How do I get rid of
> them, preserving data on gatewayVol and split1 volumes?
>
> Thanks.
>
> PS: opensuse 13.2
>
> # lvm version
>   LVM version:     2.02.114(2) (2014-11-28)
>   Library version: 1.03.01 (2014-11-28)
>   Driver version:  4.27.0
>
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