From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Sun, 10 Jul 2011 23:05:22 -0400
To: 9fans@9fans.net
Message-ID: <aa932a2f326dde12bfb3f120e239ba27@ladd.quanstro.net>
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Subject: Re: [9fans] fs(3) for pseudo partitions
Topicbox-Message-UUID: fdc51cb4-ead6-11e9-9d60-3106f5b1d025

On Sun Jul 10 22:58:01 EDT 2011, akumar@mail.nanosouffle.net wrote:
> For AoE reasons, I need to combine
> a mirror (of a partition of a disk and
> a whole disk) with another partition
> of a disk, in a way that the combination
> looks like a disk in itself.
>
> Has anyone tried such a thing with fs(3)?
> I have a mirror:
>
> mirror m0 /dev/sdD1/data /dev/sdC0/worm
>
> at /dev/fs/m0, and what I would like is
> a new pseudo device in fs(3) that joins
> /dev/fs/m0 and /dev/sdC0/kcache. But
> not simply as a `cat' of these two files,
> rather so that the resulting data file
> has the two as partitions.
>
> This way I don't need a ton of NICs and
> `vblade' instances for each drive/partition
> that I want to serve to my ken fs server.

there are several simple options
- write a little sd driver.  see sdloop(3) for
a prototype.

- modify vblade to serve multiple luns.

- erik