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From: Thiemo Nagel <thiemo.nagel@ph.tum.de>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Justin Piszcz <jpiszcz@lucidpixels.com>,
	Norman Elton <normelton@gmail.com>,
	linux-raid@vger.kernel.org
Subject: Re: Raid over 48 disks
Date: Thu, 20 Dec 2007 17:48:36 +0100	[thread overview]
Message-ID: <476A9CE4.4010107@ph.tum.de> (raw)
In-Reply-To: <476936DD.40301@tmr.com>

Bill Davidsen wrote:
>>     16k read    64k write
>>   chunk
>>   size    RAID 5    RAID 6    RAID 5    RAID 6
>>   128k    492    497    268    270
>>   256k    615    530    288    270
>>   512k    625    607    230    174
>>   1024k   650    620    170    75
>>   
> 
> What is your stripe cache size?

I didn't fiddle with the default when I did these tests.

Now (with 256k chunk size) I had

# cat stripe_cache_size
256

but increasing that to 1024 didn't show a noticeable improvement for 
reading.  Still around 550MB/s.

Kind regards,

Thiemo

  parent reply	other threads:[~2007-12-20 16:48 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-18 17:29 Raid over 48 disks Norman Elton
2007-12-18 18:27 ` Justin Piszcz
2007-12-18 19:34   ` Thiemo Nagel
2007-12-18 19:52     ` Norman Elton
2007-12-18 20:19       ` Thiemo Nagel
2007-12-18 20:25     ` Justin Piszcz
2007-12-18 21:13       ` Thiemo Nagel
2007-12-18 21:20         ` Jon Nelson
2007-12-18 21:40           ` Thiemo Nagel
2007-12-18 21:43           ` Justin Piszcz
2007-12-18 21:21         ` Justin Piszcz
2007-12-19 15:21         ` Bill Davidsen
2007-12-19 15:02           ` Justin Piszcz
2007-12-20 16:48           ` Thiemo Nagel [this message]
2007-12-21  1:53             ` Bill Davidsen
2007-12-18 18:45 ` Robin Hill
2007-12-18 20:28 ` Neil Brown
2007-12-19  8:27   ` Mattias Wadenstein
2007-12-19 15:26     ` Bill Davidsen
2007-12-21 11:03     ` Leif Nixon
2007-12-25 17:31   ` pg_mh, Peter Grandi
2007-12-25 21:08     ` Bill Davidsen
2007-12-18 20:36 ` Brendan Conoboy
2007-12-18 23:50   ` Guy Watkins
2007-12-18 23:58     ` Justin Piszcz
2007-12-18 23:59       ` Justin Piszcz
2007-12-19 12:08     ` Russell Smith
2007-12-21 10:57 ` Leif Nixon

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