From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: Add BBL to existing array
Date: Wed, 27 Aug 2014 21:07:00 +1000
Message-ID: <20140827210700.5a9b3e60@notabene.brown>
References: <20140827090707.GA15857@dolores.internal.speartail.com>
	<20140827192721.57c57c3b@notabene.brown>
	<20140827103213.GE15857@dolores.internal.speartail.com>
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To: Peter Hoeg <peter@hoeg.com>
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On Wed, 27 Aug 2014 18:32:13 +0800 Peter Hoeg <peter@hoeg.com> wrote:

> Hi,
>=20
> this isn't so much a question as it trying to document the situation
> with BBL's on Debian jessie, although if I've overlooked something,
> please let me know.
>=20
> Purpose: Add BBL to a RAID created by an earlier version of mdadm
> without BBL support.
>=20
> # mdadm --version
>=20
> mdadm - v3.3 - 3rd September 2013
>=20
>=20
> # uname -a
>=20
> Linux edith 3.14-2-amd64 #1 SMP Debian 3.14.15-2 (2014-08-09) x86_64 GNU/=
Linux
>=20

They should be new enough to handle bbls.

>=20
> # cat /proc/mdstat
>=20
> Personalities : [raid6] [raid5] [raid4]
> md0 : active raid6 sda2[0] sdd2[4] sdc2[3] sdb2[1]
>       5859439616 blocks super 1.2 level 6, 512k chunk, algorithm 2 [4/4] =
[UUUU]
>       bitmap: 1/2 pages [4KB], 1048576KB chunk
>=20
> unused devices: <none>
>=20
>=20
> As the system boots from the RAID, I thought I could be clever and
> simply edit /usr/share/initramfs-tools/scripts/local-top/mdadm and
> change the "--assemble" statements to add "--update=3Dbbl" which should
> take care of things after a reboot.
>=20
> It basically runs:
> # mdadm --assemble --scan --run --auto=3Dyes
>=20
> so it would become:
> # mdadm --assemble --update=3Dbbl --scan --run --auto=3Dyes

Sorry, --update and --scan are incompatible.

>=20
>=20
> That didn't work. I ended up in the initramfs and had to manually bring
> up the RAID as well as LVM to get the machine booted.

That would have been a good time to wield the --update=3Dbbl seeing you were
assembling the array anyway.


>=20
> Now, according to the manual with the version of mdadm on the machine,
> '--update=3Dbbl' is supported, however when asking mdadm directly, it
> doesn't seem to be the case:
>=20
> # mdadm --assemble --update=3D?
>=20
> mdadm: Valid --update options are:
>      'sparc2.2', 'super-minor', 'uuid', 'name', 'resync',
>      'summaries', 'homehost', 'byteorder', 'devicesize',
>      'no-bitmap', 'metadata', 'revert-reshape'

Oops.  I forgot to update that list when I added 'bbl' and 'no-bbl'.

Will be fixed in 3.3.3.


Thanks for the report,

NeilBrown


>=20
> So in all likelyhood, this is a Debian packaging issue.
>=20
> If anyone answers, please CC me as I am not subscribed to the list, thank=
s.
>=20
> --
> Regards,
> Peter
> --
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