linux-ext4 - Re: [RFC] store RAID stride in superblock

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Message-Id: <1180645351.3922.1.camel@garfield>
Date:	Fri, 01 Jun 2007 02:32:29 +0530
From:	Kalpak Shah <kalpak@...sterfs.com>
To:	Andreas Dilger <adilger@...sterfs.com>
Cc:	Theodore Tso <tytso@....edu>,
	Rupesh Thakare <rupesh@...sterfs.com>,
	linux-ext4@...r.kernel.org
Subject: Re: [RFC] store RAID stride in superblock

On Thu, 2007-05-31 at 14:19 -0600, Andreas Dilger wrote:
> On May 31, 2007  12:21 -0400, Theodore Tso wrote:
> > On Thu, May 24, 2007 at 07:45:32PM +0530, Rupesh Thakare wrote:
> > > I've added "s_raid_stripe_width" parameter in superblock.
> > > I've also incorporated "s_raid_stride" and "s_raid_stripe_width" 
> > > parameters in tune2fs.
> > > The new options can be specified using  '-E options' in both mke2fs and 
> > > tune2fs.
> > > Both the Man pages (mke2fs and tune2fs) are updated accordingly.
> > > Patch is attached herewith.
> > 
> > Thanks.  I've used a different offset for the raid_stripe_width, to
> > avoid conflicting with Kalpak's mmp patch.  
> 
> Ah, we've been doing it the other way around here.  It makes sense to keep
> the s_raid_stripe_width fields together.  I think this code is preliminary
> enough that nobody has actually started using it yet.  Can you please post
> what the end of ext2_super_block looks like (whether you decide to reorder
> the fields or not).

I can update the MMP patches when I actually send them for inclusion. So
I think it makes sense to keep the s_raid_* fields together.

Thanks,
Kalpak.

> 
> Cheers, Andreas
> --
> Andreas Dilger
> Principal Software Engineer
> Cluster File Systems, Inc.
> 
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