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From: Ricardo Wurmus <rekado@elephly.net>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: Re: Update on bordeaux.guix.gnu.org
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Hi,

[space is running out on bayfront, so I wrote:]

> Remember that I=E2=80=99ve got three 256G SSDs here that I could send to
> wherever bayfront now sits.  With LVM or a RAID configuration=20
> these could just be added to the storage pool =E2=80=94 if bayfront has
> sufficient slots for three more disks.

You wrote in response:

> Good to know.  In that case we=E2=80=99d need to come up with (1) an=20
> updated
> Guix System config with LVM, and (2) a way to copy the existing=20
> store
> over to the new storage, which sounds tricky if the existing=20
> disk is to
> be kept.

We could first install Guix System with the adjusted bayfront=20
config on a separate machine (e.g. on a build node at the MDC),=20
onto a volume with LVM (using as many of the SSDs as needed).=20
Copy signing keys etc from bayfront.  Then we=E2=80=99d pretty much=20
export/import the bayfront store over the network.  Once=20
everything has been copied, we turn off bayfront, swap the disks,=20
boot it up again.  If everything works all right we add the=20
original disk (and any unused left-over disks) to the LVM volume=20
to extend the storage pool.

The trickiest bit is to minimize the time between finishing the=20
sync and swapping the disks.

> (Also I think we=E2=80=99re down to 1.5 person who could go on
> site. :-/)

Not great :-/

--=20
Ricardo