Re: Trouble stacking mdadm, multipath and lvm at boot
On Mon, Jun 26, 2017 at 02:21:43PM -0400, E V wrote:
> I'm trying to get mdadm to assemble an array on some multipath disks
> at boot. System is a fresh install of stretch. By default it seems the
> mdadm array auto assembles before the multipath devices are created
> and thus doesn't use the dm- multi path devices but just the sdx
> devices, which prevents the multipath devices from ever getting
> created. Adding the DEVICE lines in mdadm.conf for the
> /dev/mapper/mpathx devices kind of reverses the problem. Now the
> multipath devices do get created, but the array(and thus the lvol &
> filesystem) never gets assembled on boot. In the old init days I'd
> probably add a script that runs mdadm --assemble and mount at the end
> of boot, but not sure what the right way to handle this in systemd is.
> mdadm.conf lines:
>
> DEVICE /dev/mapper/mpathb /dev/mapper/mpathc /dev/mapper/mpathd
> /dev/mapper/mpathe
> ARRAY /dev/md/0
> devices=/dev/mapper/mpathb,/dev/mapper/mpathc,/dev/mapper/mpathd,/dev/mapper/mpathe
> metadata=1.2 spares=1 name=tst3:0
> UUID=7809f500:667e7a8f:45222d03:7405415b
>
>
> Thoughts or suggestions?
Why not let mdadm manage multipath instead of getting dm involved?
--
Len Sorensen
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