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



On 05/08/2014 12:45 PM, 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


Peter, is this an error in LVM filtering or is manual filter modification required?

Michal(-e), I suggest modifying global_filter to accept only the devices you want in the VG.

-- Martian


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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