From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@9fans.net
Subject: Re: [9fans] Mirrorarenas in p9p
From: "Russ Cox" <rsc@swtch.com>
Date: Thu, 31 Jul 2008 18:13:47 -0400
In-Reply-To: <073120081952.25804.48921807000DA385000064CC22193100029B0A02D2089B9A019C04040A0DBF9B9D0E9A9B9C040D@att.net>
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>> Also, if you do create a Plan 9 partition and
>> then prep it to make subpartitions (you'd have
>> to use 9vx, copying the binaries from sources),
>> then p9p venti can handle those partition names
>> too: /dev/sda1:arenas assuming /dev/sda1 is a
>> Plan 9 fdisk partition containing a subpartition
>> named arenas.
>
> So here's what I ended up with.  I installed 9vx on
> the machine and used that to partition the big
> drive: one fairly big partition with 4 subpartitions
> for the 4 arena disks already on the machine. The
> p9p mirrorarenas didn't like the partition name
> notation.  It calls initpart which calls parsepart
> which seems to only like the numeric range notation.
> But running the Plan 9 mirrorarenas in 9vx works
> just fine.  So I'm pretty much where I want to be
> for now.

It should be there as of HG revision 2825 (July 3).
The particular file contents that I expect are at
http://swtch.com/go/venti-plan9-partitions
It's at the bottom of the file.

In addition to /dev/sda1:arenas you can say
/dev/sda:arenas -- the code parses the fdisk table
to find the Plan 9 partition too (but it's also happy
if you give it the Plan 9 partition directly).

Using 9vx is fine, of course, but this is one less
moving piece in your mirroring scripts.

Russ