Control: tag -1 +pending Thanks for confirming Carlos. The following has been added and will be part of the next upload.
commit 00b79442b9af0c5275880b73b9bae5c68150e2c5 (HEAD -> master)
Author: Ritesh Raj Sarraf <r...@debian.org>
Date: Mon Dec 20 15:29:43 2021 +0530
Add some documentation about LVM + DM-Multipath setup
Thanks: Carlos Barros
Closes: 1001710
diff --git a/debian/multipath-tools.README.Debian
b/debian/multipath-tools.README.Debian
index 257eebdb..ec1dee40 100644
--- a/debian/multipath-tools.README.Debian
+++ b/debian/multipath-tools.README.Debian
@@ -1,6 +1,24 @@
Additional information for users of multipath-tools from Debian.
+LVM over DM-Multipath
+=====================
+
+Debigu Bug #1001710
+
+On a setup that involves both, LVM and DM-Multipath, it is important to set the
+right filter in lvm.conf file to ensure that LVM does not acquire the bare
SCSI devices
+before DM-Multipath can.
+
+On such combined setups, the standard recommendation is to pvcreate devices on
the
+enumerated multipathed devices. And also ensure that the bare SCSI devices are
filtered out
+from LVM's list
+
+ # filter = [ "a|/dev/mapper/|", "r|/block/|", "r|/disk/|",
"r|/sd[b-z].*|", "a|.*|" ]
+
+In the above example snippet, it is ensured that LVM filters out any SCSI
devices of name type
+sd[b-z].*
+
On Fri, 2021-12-17 at 21:59 +0000, BARROS FERNANDEZ, Carlos wrote:
> Hello Ritesh.
>
> Thanks for your answer.
>
> Tried serveral things to make it work, but only a filter in lvm.conf
> did work. (the pv's were created under multipath, and also did
> several vgcfgbackup, the pv's did not have any /dev/sd?? written in
> their sectors)
> The filter that I put is:
> filter = [ "a|/dev/mapper/|", "r|/block/|", "r|/disk/|", "r|/sd[b-
> z].*|", "a|.*|" ]
>
> I had to put sd[b-z].* because the system in installed in lvm too, so
> I had to exclude that device. Maybe there is a better filter, but I
> do not know how to write it.
>
> The server uses a RAID controller for internal disks and hba for the
> external disks
>
> Right now, it seems stable between reboots, I hope that the raid
> controller will always setup before the hba, otherwise the filter
> won't work.
>
> I think that this info can be of help to other users, could you put a
> README.debian including this filter? (or modify the lvm.conf to add
> the note)
> Like:
> To setup LVM over multipath, and allow other LVM over a non
> multpathed device, if you encounter that the pv-devices are not
> under
> multipath control, try this filter line in lvm.conf, update-initrd
> and reboot. to check it that it works ok.
>
> filter = [ "a|/dev/mapper/|", "r|/block/|", "r|/disk/|",
> "r|/sd[b-z].*|", "a|.*|" ]
> sd[b-z].* makes all /dev/sd* be skipped but /dev/sda.
> Adjust for your hardware configuration.
--
Ritesh Raj Sarraf | http://people.debian.org/~rrs
Debian - The Universal Operating System
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