From: Stan Hoeppner <stan@hardwarefreak.com>
To: Chris Murphy <lists@colorremedies.com>
Cc: xfs <xfs@oss.sgi.com>
Subject: Re: relationship of nested stripe sizes, was: Question regarding XFS on LVM over hardware RAID.
Date: Sat, 01 Feb 2014 12:47:31 -0600 [thread overview]
Message-ID: <52ED4143.6090303@hardwarefreak.com> (raw)
In-Reply-To: <7A732267-B34F-4286-9B49-3AF8767C0B89@colorremedies.com>
On 1/31/2014 12:35 AM, Chris Murphy wrote:
> Hopefully this is an acceptable way to avoid thread jacking, by
> renaming the subject…
>
> On Jan 30, 2014, at 10:58 PM, Stan Hoeppner <stan@hardwarefreak.com>
> wrote:
>>
>> RAID60 is a nested RAID level just like RAID10 and RAID50. It is
>> a stripe, or RAID0, across multiple primary array types, RAID6 in
>> this case. The stripe width of each 'inner' RAID6 becomes the
>> stripe unit of the 'outer' RAID0 array:
>>
>> RAID6 geometry 128KB * 12 = 1536KB RAID0 geometry 1536KB * 3 =
>> 4608KB
>
> My question is on this particular point. If this were hardware raid6,
> but I wanted to then stripe using md raid0, using the numbers above
> would I choose a raid0 chunk size of 1536KB? How critical is this
> value for, e.g. only large streaming read/write workloads? If it were
> smaller, say 256KB or even 32KB, would there be a significant
> performance consequence?
You say 'if it were smaller...256/32KB'. What is "it" referencing?
--
Stan
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next prev parent reply other threads:[~2014-02-01 18:47 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 [this message]
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
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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