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Date: Sun, 28 Feb 2010 10:03:04 -0500 (EST) From: Justin Piszcz <jpiszcz@...idpixels.com> To: Mike Snitzer <snitzer@...il.com> cc: Bill Davidsen <davidsen@....com>, Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org, linux-ext4@...r.kernel.org, Alan Piszcz <ap@...arrain.com> Subject: Re: mdadm software raid + ext4, capped at ~350MiB/s limitation/bug? On Sun, 28 Feb 2010, Mike Snitzer wrote: > On Sun, Feb 28, 2010 at 4:45 AM, Justin Piszcz <jpiszcz@...idpixels.com> wrote: [ .. ] > > How did you format the ext3 and ext4 filesystems? > > Did you use mkfs.ext[34] -E stride and stripe-width accordingly? > AFAIK even older versions of mkfs.xfs will probe for this info but > older mkfs.ext[34] won't (though new versions of mkfs.ext[34] will, > using the Linux "topology" info). Yes and it did not make any difference: http://lkml.org/lkml/2010/2/27/77 Incase anyone else wants to try too, you can calculate by hand, or if you are in a hurry, I found this useful: http://busybox.net/~aldot/mkfs_stride.html I believe there is something fundamentally wrong with ext4 when performing large sequential I/O when writing, esp. after Ted's comments. Justin. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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