From: John Lange <john.lange@bighostbox.com>
To: Guy <bugzilla@watkins-home.com>
Cc: 'LinuxRaid' <linux-raid@vger.kernel.org>
Subject: RE: Please review: Slackware RAID How-To
Date: Wed, 19 May 2004 20:42:29 -0500 [thread overview]
Message-ID: <1085017348.8670.26.camel@localhost> (raw)
In-Reply-To: <200405170451.i4H4pqB05999@www.watkins-home.com>
On Sun, 2004-05-16 at 23:51, Guy wrote:
> md2 has 4 disks with a chunk size of 128K. Since only 3 disks are used for
> data, and the filesystem block size is 4K, the stride size should be
> 128*3/4, or 96.
> Change:
> mke2fs -b 4096 -R stride=32 /dev/md2
> To:
> mke2fs -b 4096 -R stride=96 /dev/md2
>
> My logic:
> "Stripe size" is "chunk size" times "number of data disks".
> From example:
> "chunk size" = 128
> "number of data disks" = "nr-raid-disks" - 1 (-2 if RAID6)
I think this is incorrect. At this point I defer to the
Software-RAID-HOWTO.
http://www.tldp.org/HOWTO/Software-RAID-HOWTO-5.html#ss5.10
From that document stride is chucksize/blocksize . Number of disks does
not enter into it.
So with a chunksize of 128, and a block size of 4 it would be:
128K/4K = 32 for stride.
If this is indeed correct I will be sure to expand that area of the
How-To so it is more clear.
Thanks very much for your feedback.
Regards,
John Lange
next prev parent reply other threads:[~2004-05-20 1:42 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-11 15:42 Please review: Slackware RAID How-To John Lange
2004-05-11 23:51 ` Ninti Systems
2004-05-16 5:43 ` Ninti Systems
2004-05-16 6:40 ` Ninti Systems
2004-05-17 2:36 ` Ninti Systems
2004-05-17 4:51 ` Guy
2004-05-17 9:02 ` Ninti Systems
2004-05-20 1:42 ` John Lange [this message]
2004-05-20 2:06 ` Ninti Systems
2004-05-20 3:27 ` Guy
2004-05-20 3:33 ` John Lange
2004-05-20 5:02 ` Guy
2004-05-20 7:58 ` John Lange
2004-05-20 13:37 ` Guy
2004-05-21 2:25 ` Ninti Systems
2004-05-21 2:55 ` Guy
2004-05-21 2:47 ` Ninti Systems
2004-05-20 3:11 ` Guy
2004-05-20 4:35 ` Guy
-- strict thread matches above, loose matches on Subject: below --
2004-05-13 9:46 George Iosif
2004-05-14 6:21 George Iosif
[not found] <s0a48f9e.018@nsa.ase.ro>
2004-05-14 6:47 ` John Lange
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