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
next prev 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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