Message-ID: <53467A47.4090602@panasas.com>
Date: Thu, 10 Apr 2014 14:02:31 +0300
From: Boaz Harrosh <bharrosh@panasas.com>
MIME-Version: 1.0
To: open-osd <osd-dev@open-osd.org>, NFS list <linux-nfs@vger.kernel.org>,
        Daniel Gryniewicz <dang@linuxbox.com>,
        Elizabeth Ellenbogen Ziph <elizabeth@linuxbox.com>,
        "Pathak, Santosh" <santoshp@panasas.com>
CC: Benny Halevy <bhalevy@primarydata.com>,
        Sachin bhamare <sachin.bhamare@gmail.com>
Subject: Re: [osd-dev] [RFC 0/3] ore: raid6
References: <53467667.3010304@panasas.com>
In-Reply-To: <53467667.3010304@panasas.com>
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Sender: linux-nfs-owner@vger.kernel.org

On 04/10/2014 01:45 PM, Boaz Harrosh wrote:
> Hi all
> 
> proud to present some experimentation with raid6 in ORE.
> 
> These simple patches will enable raid6 using the Kernel's raid6_pq engine
> for support under exofs and pnfs-objects. There is nothing needed to do
> at exofs and pnfs-obj. Just fire your mkfs.exofs with --raid=6 (that was
> already supported before) and off you go as usual. The ORE will pick up
> the new map and will start writing two devices of redundancy bits.
> 
> Very RFC right now. Only lightly tested. Git clone linux and compile.
> Only a very few parameters tested:
> 	group_width=5 && group_width=6 s_unit=4*PAGES && s_unit=1*PAGE
> Please have a try, report all the crashes.
> 

Forgot to say if anyone wants to test here:
	git clone git://git.open-osd.org/linux-open-osd.git raid6

> In the next iteration I would like to add some raid6-math documentation
> which I think is needed for completeness.
> 
> I want to deeply thank Daniel Gryniewicz who found first all the
> bugs in the old raid code, and inspired these patches.
> 
> list of patches:
> [PATCH 1/4] ore: (trivial) reformat some code
> [PATCH 2/4] ore: Remove redundant dev_order(), more cleanups
> [PATCH 3/4] ore: Support for raid 6
> 
> Cheers
> Boaz