Re: [linux-lvm] No device found for PV but is actually fine

[Jack Waterworth <jack@redhat.com>]

Hi Michael,

   Check your pvs output to see if any of your pvs have the 'm' 
attribute. This means the device has been marked as missing in the metadata.

You can remove this attribute by running the vgextend command.

     # vgextend --restoremissing /dev/device

I usually see this happen on virtual machines. Is this setup running on 
a virt?

  Jack Waterworth
  Senior Technical Support Engineer
  Red Hat Global Support Services North America
  919.754.4625

On 05/08/2014 06:45 AM, Michal Svoboda wrote:
> Hi all,
>
> I have a weird issue:
>
> # pvs
>   No device found for PV JszGc1-S16s-bsFQ-weAl-aj8W-d6y4-BeVqcN.
>   PV         VG    Fmt  Attr PSize   PFree
>   /dev/sdc   data2 lvm2 a--  298.09g    0
>   /dev/sdd1  data  lvm2 a--  298.09g    0
>
> # pvscan
>    No device found for PV JszGc1-S16s-bsFQ-weAl-aj8W-d6y4-BeVqcN.
>    No device found for PV JszGc1-S16s-bsFQ-weAl-aj8W-d6y4-BeVqcN.
>    PV /dev/sdc    VG data2   lvm2 [298.09 GiB / 0    free]
>    PV /dev/sdd1   VG data    lvm2 [298.09 GiB / 0    free]
>    Total: 2 [596.18 GiB] / in use: 2 [596.18 GiB] / in no VG: 0 [0   ]
>
> # pvscan --cache
>    Found duplicate PV JszGc1S16sbsFQweAlaj8Wd6y4BeVqcN: using /dev/sde2 not /dev/md0
>    Found duplicate PV JszGc1S16sbsFQweAlaj8Wd6y4BeVqcN: using /dev/sdf2 not /dev/sde2
>
> The VG on the "missing" PV is called "system", but:
>
> # vgdisplay /dev/system
>    No device found for PV JszGc1-S16s-bsFQ-weAl-aj8W-d6y4-BeVqcN.
>    --- Volume group ---
>    VG Name               system
>    System ID
>    Format                lvm2
>    Metadata Areas        0
>    Metadata Sequence No  28
>    VG Access             read/write
>    VG Status             resizable
>    MAX LV                0
>    Cur LV                8
>    Open LV               8
>    Max PV                0
>    Cur PV                1
>    Act PV                0
>    VG Size               232.88 GiB
>    PE Size               4.00 MiB
>    Total PE              59616
>    Alloc PE / Size       33792 / 132.00 GiB
>    Free  PE / Size       25824 / 100.88 GiB
>    VG UUID               fQoJ8p-BI3D-BcEH-BiQX-JJqf-p6TT-6KIoRt
>
> Actually all LVs on the "system" VG are present and accounted for. The
> LVs contain the root file system, and some virtual machine drives, all
> of which are running *fine* (and the system in fact boots up from the
> "missing" PV :). But I can't resize:
>
> # lvextend -L +16G /dev/system/vm-monitor
>    No device found for PV JszGc1-S16s-bsFQ-weAl-aj8W-d6y4-BeVqcN.
>    Cannot change VG system while PVs are missing.
>    Consider vgreduce --removemissing.
>
> The "system" VG is situated on a md raid1. I think it all happened after
> I replaced all the drives of that md with mdadm --replace with bigger
> disks. But I can't be sure, because the system in fact works and except
> the inability to resize there are no problems.
>
> I have googled around a bit, but to no avail. Can someone help me
> diagnose and repair this?
>
> Version info:
>
> # pvs --version
>    LVM version:     2.02.105(2) (2014-01-20)
>    Library version: 1.02.84 (2014-01-20)
>    Driver version:  4.27.0
>
> # cat /proc/version
> Linux version 3.14.0-4-ARCH (nobody@var-lib-archbuild-extra-x86_64-thomas) (gcc version 4.8.2 20140206 (prerelease) (GCC) ) #1 SMP PREEMPT Wed Apr 9 21:11:25 CEST 2014
>
>
> Thanks,
> Michal Svoboda
>
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