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From: Zdenek Kabelac <zdenek.kabelac@gmail.com>
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Date: Sat, 14 Jan 2017 10:26:04 +0100
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Subject: Re: [linux-lvm] Again: duplicate PVs - filter rules
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To: LVM general discussion and development <linux-lvm@redhat.com>

Dne 14.1.2017 v 06:41 knebb@knebb.de napsal(a):
> Hi all,
>
> I thought my filter rules where fine now. But they are not.
>
> I have in /etc/lvm/lvm.conf:
>
>  filter = [ "r|/dev/sdb|","r|/dev/sdc|" ]
>
> I scan my PVs:
>
> [root@backuppc ~]# pvscan --cache
>   WARNING: PV AvK0Vn-vAdJ-K4nf-0N1x-u1fR-dlWG-dJezdg on /dev/sdc was
> already found on /dev/drbd1.
>   WARNING: Disabling lvmetad cache which does not support duplicate PVs.
>   WARNING: Not using lvmetad because duplicate PVs were found.
> [root@backuppc ~]# pvscan
>   WARNING: PV AvK0Vn-vAdJ-K4nf-0N1x-u1fR-dlWG-dJezdg on /dev/sdc was
> already found on /dev/drbd1.
>   WARNING: Disabling lvmetad cache which does not support duplicate PVs.
>   WARNING: Not using lvmetad because duplicate PVs were found.
>   PV /dev/sda2    VG cl              lvm2 [15,00 GiB / 0    free]
>   PV /dev/drbd1   VG test            lvm2 [3,00 GiB / 0    free]
>   Total: 2 [17,99 GiB] / in use: 2 [17,99 GiB] / in no VG: 0 [0   ]
>
> So question again, why does it accept my /dev/sdc as PV discarding
> filter rules?

'pvscan --cache' is different from other lvm commands - it controls filling
of 'lvmetad' from udev rules.

So if you plan to use lvmetad - you need to have uniqueness on 'global' level.

So that's why there is global_filter.

So you should copy  your filter  to  global_filter.

Regards


Zdenek