From mboxrd@z Thu Jan  1 00:00:00 1970
MIME-Version: 1.0
Date: Fri, 12 Aug 2011 11:53:09 +0200
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@9fans.net>
From: "Bernd Maier" <bema@hush.com>
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="UTF-8"
Message-Id: <20110812095309.3847714DBD4@smtp.hushmail.com>
Subject: Re: [9fans] Fossil fs recovery
Topicbox-Message-UUID: 120d89d6-ead7-11e9-9d60-3106f5b1d025

Many thanks! I will try it this weekend.

One additional question:

How much RAM needs the Fossil+Venti Fileserver in total?

-Bernd

On Thu, 11 Aug 2011 10:11:27 +0200 David du Colombier
<0intro@gmail.com> wrote:
>In fact, it's pretty straightforward.
>
>In the following example, I consider you have a disk sdE0
>with Fossil, and you want to add a disk sdE1 with Venti.
>
>Create the Venti partitions:
>
>disk/fdisk -baw /dev/sdE1/data
>disk/prep -bw -a^(isect arenas bloom) /dev/sdE1/plan9
>
>Format the Venti file systems:
>
>venti/fmtisect isect /dev/sdE1/isect
>venti/fmtarenas arenas /dev/sdE1/arenas
>venti/fmtbloom /dev/sdE1/bloom
>
>Since the bloom filter requires memory equal to its size
>on disk, you could need to pass the parameter -s to fmtbloom
>to specify its size or directly adjust the partition size.
>Keep in mind that Venti use 20% total memory by default, and
>1/3 of it is allocated to the bloom filter.
>For example, with 1 GB of memory, you cannot have a bloom filter
>larger than 64 MB (which is sufficient) with the default settings.
>Of course, the bloom filter is optional anyway.
>
>Configure Venti:
>
>echo 'index main
>isect /dev/sdE1/isect
>arenas /dev/sdE1/arenas
>bloom /dev/sdE1/bloom' | venti/conf -w /dev/sdE1/arenas
>
>Initialize the index sections:
>
>venti/fmtindex /dev/sdE1/arenas
>
>Read your current Fossil configuration:
>
>fossil/conf /dev/sdE0/fossil > fossil.conf
>
>Edit fossil.conf, it should look like something like:
>
>fsys main config /dev/sdE0/fossil
>fsys main open -V -c 3000
>
>Remove -V to open and srv if needed, then
>add the following line to enable automatic
>snapshots:
>
>fsys main snaptime -s 60 -a 0530 -t 2880
>
>(snapshot at 05:30, temporary snapshot each
> hour and discarded after two days)
>
>Write your new Fossil configuration:
>
>fossil/conf -w /dev/sdE0/fossil < fossil.conf
>
>Mount your 9fat file system, then add the following line
>to the file /n/9fat/plan9.ini:
>
>venti=#S/sdE1/arenas
>
>After rebooting, the current Fossil content will be dumped
>to Venti.
>
>--
>David du Colombier