<html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> </head> <body bgcolor="#FFFFFF" text="#000000"> Hi all, I am using LVM for several years but now I face an issue where I have no clue how to deal with. I want to have a VG on top of a drbd device (Distributed Replicated Block Device) which should not be an issue according to docs: <a class="moz-txt-link-freetext" href="https://www.drbd.org/en/doc/users-guide-83/s-lvm-drbd-as-pv">https://www.drbd.org/en/doc/users-guide-83/s-lvm-drbd-as-pv</a> Unfortunately I am always getting "duplicate device" errors as LVM recons a pv on /dev/sdb (underlying device for drbd) as well as on /dev/drbd0 Now I tried to configure filters to match my setup. But it seems I do not understand the filter rules. I need to enable /dev/sda incl. all partitions. (for root) I need to disable /dev/sdb at all as it is the device for drbd! I need to enable /dev/drbd0 as the "real" PV. I can disable all others. So I tried: filter = [ "r|sdb.*/|","a|drbd0/|","a|.*/|" ] Which results in the duplicate-issue: [root@backuppc ~]# pvcreate /dev/drbd0 Physical volume "/dev/drbd0" successfully created. [root@backuppc ~]# pvscan --cache WARNING: PV eEpd0B-VaET-V2mH-9InB-pYab-P5Bp-hjfOhh on /dev/sdb was already found on /dev/drbd0. WARNING: Disabling lvmetad cache which does not support duplicate PVs. WARNING: Not using lvmetad because duplicate PVs were found. So anyone having an idea what is wrong with my filter config? As the docs are very unclear about the exact syntax I did as well some other versions but no one leads to the resul I want to have... So what are correct filter rules? Greetings /christian </body> </html>