linux-kernel - WalB: a wrapper block device driver for efficient backup and replication

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Message-ID: <51AC5422.1080103@labs.cybozu.co.jp>
Date:	Mon, 03 Jun 2013 17:30:26 +0900
From:	Takashi HOSHINO <hoshino@...s.cybozu.co.jp>
To:	Ric Wheeler <rwheeler@...hat.com>, linux-scsi@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
CC:	Takashi HOSHINO <hoshino@...s.cybozu.co.jp>
Subject: WalB: a wrapper block device driver for efficient backup and replication

Hello,

I'm developing a wrapper block device driver called 'WalB'
that provides wrapper block devices to get consistent diff blocks
without full-scans of devices using Write-Ahead Logging technology,
in order to achieve incremental backup and asynchronous replication.

Its source code and documents are available in GitHub:
https://github.com/starpos/walb
https://github.com/starpos/walb/blob/develop/doc/index.creole

You can try it from now.
It supports kernel 3.2 to 3.9 and x86_64 architecture currently.

WalB achieves small overhead of IO response with:
- No persistent indexes.
- No undo-logs, just redo-logs.
- No block-level fragmentation.

I've talked about WalB at LinuxCon Japan 2013.
The slides in pdf are here:
http://www.slideshare.net/starpos/wal-b-linuxconjapan2013

At the conference, I asked Mr. Ric Wheeler what to do for the module to
be merged to the mainline kernel, and he suggested submitting an e-mail
ASAP.

WalB is provided as a single module currently.
It seems not so difficult to create 'drivers/block/walb' directory like
DRBD.
Is that nice idea? or do you have any comments?

Regards,

Takashi Hoshino
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