From: Dave Chinner <david@fromorbit.com>
To: Chris Murphy <lists@colorremedies.com>
Cc: "stan@hardwarefreak.com Hoeppner" <stan@hardwarefreak.com>,
xfs <xfs@oss.sgi.com>
Subject: Re: relationship of nested stripe sizes, was: Question regarding XFS on LVM over hardware RAID.
Date: Mon, 3 Feb 2014 08:30:30 +1100 [thread overview]
Message-ID: <20140202213030.GQ2212@dastard> (raw)
In-Reply-To: <98961D3F-769D-44A9-98A8-FC7867893138@colorremedies.com>
On Sun, Feb 02, 2014 at 11:09:11AM -0700, Chris Murphy wrote:
> On Feb 1, 2014, at 2:44 PM, Stan Hoeppner <stan@hardwarefreak.com>
> wrote:
> > On 2/1/2014 2:55 PM, Chris Murphy wrote:
> >> On Feb 1, 2014, at 11:47 AM, Stan Hoeppner
> >> <stan@hardwarefreak.com> wrote:
> > When nesting stripes, the chunk size of the outer stripe is
> > -always- equal to the stripe width of each inner striped array,
> > as I clearly demonstrated earlier:
>
> Except when it's hardware raid6, and software raid0, and the user
> doesn't know they need to specify the chunk size in this manner.
> And instead they use the mdadm default. What you're saying makes
> complete sense, but I don't think this is widespread knowledge or
> well documented anywhere that regular end users would know this by
> and large.
And that is why this is a perfect example of what I'd like to see
people writing documentation for.
http://oss.sgi.com/archives/xfs/2013-12/msg00588.html
This is not the first time we've had this nested RAID discussion,
nor will it be the last. However, being able to point ot a web page
or or documentation makes it a whole lot easier.....
Stan - any chance you might be able to spare an hour a week to write
something about optimal RAID storage configuration for XFS?
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2014-02-02 21:31 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-31 6:35 relationship of nested stripe sizes, was: Question regarding XFS on LVM over hardware RAID Chris Murphy
2014-02-01 18:47 ` Stan Hoeppner
2014-02-01 20:55 ` Chris Murphy
2014-02-01 21:44 ` Stan Hoeppner
2014-02-02 18:09 ` Chris Murphy
2014-02-02 21:30 ` Dave Chinner [this message]
2014-02-03 4:39 ` Stan Hoeppner
2014-02-03 5:24 ` Dave Chinner
2014-02-03 9:36 ` Stan Hoeppner
2014-02-03 21:54 ` Dave Chinner
2014-02-04 7:06 ` documentation framework [was Re: relationship of nested stripe sizes, was: Question regarding XFS on LVM over hardware RAID.] Dave Chinner
2014-02-03 10:50 ` relationship of nested stripe sizes, was: Question regarding XFS on LVM over hardware RAID Stan Hoeppner
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