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From: Michal Soltys <soltys@ziu.info>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: linux-raid@vger.kernel.org, xfs@oss.sgi.com
Subject: Re: How do I tell if my partition is aligned for a 64k/RAID-6?
Date: Fri, 26 Dec 2008 00:02:12 +0100	[thread overview]
Message-ID: <495410F4.5010508@ziu.info> (raw)
In-Reply-To: <alpine.DEB.1.10.0812250821360.31386@p34.internal.lan>

> 
> I am not worried about the filesystem as the defaults usually get it 
> right but with parted, this is the first time I had to use it for home 
> use and with RAID-6 I am noticing slower performance with 15 disks (1 is 
> a spare) in RAID-6 (albeit slower 7200 ones, RE3s) than I was getting 
> with 10 raptor150s in RAID-6 (but I had used fdisk there).
> 
> Justin.
> 

For best effect - partition should start at 1920th sector (stripe width
boundary), and su/sw should be appropriately set - su=64k,sw=13 in your
case. Parted shows the values normally - from the beginning of the 
volume, 0 based.


ps.

I dropped some of CCs.


  parent reply	other threads:[~2008-12-25 23:02 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-25 13:31 How do I tell if my partition is aligned for a 64k/RAID-6? Justin Piszcz
2008-12-25 13:31 ` Justin Piszcz
2008-12-25 13:31 ` Justin Piszcz
2008-12-25 22:53 ` Justin Piszcz
2008-12-25 22:53   ` Justin Piszcz
2008-12-25 22:53   ` Justin Piszcz
2008-12-25 23:02 ` Michal Soltys [this message]
2008-12-25 23:46   ` Justin Piszcz
2008-12-25 23:46     ` Justin Piszcz
2008-12-27 13:38     ` Josef 'Jeff' Sipek
2008-12-27 13:53       ` Justin Piszcz
2008-12-27 13:53         ` Justin Piszcz
2008-12-27 13:58         ` Josef 'Jeff' Sipek
2008-12-27 13:58           ` Josef 'Jeff' Sipek
2008-12-27 14:05           ` Justin Piszcz
2008-12-27 14:05             ` Justin Piszcz
2008-12-27 14:20           ` John Robinson

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