From: Art Wildman <Art.Wildman@noaa.gov>
To: jassduec@gmail.com
Cc: Lothar Braun <mail@lobraun.de>,
linux-admin@vger.kernel.org, linux-config@vger.kernel.org
Subject: Re: High iowait
Date: Thu, 24 Aug 2006 16:06:16 -0400 [thread overview]
Message-ID: <44EE06B8.70304@noaa.gov> (raw)
In-Reply-To: <3a1eedb70608230910u34ce5e96hf36f25f0ff560ea4@mail.gmail.com>
jassduec@gmail.com wrote:
> Basically i am not able to achieve the kind of throughput which i
> should get from my RAID system. And i think the OS is the culprit
> (some bug in the vendor kernel) since for some reason it goes into
> huge iowaits preventing the applications to read/write more data. How
> can i debug whether the problem is with the OS or with the device?
>
#1 Problem usually: Is DMA enabled? (see hdparm refs)...
RAID FAQ & Docs...
http://www.faqs.org/contrib/linux-raid/x37.html
http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/sysadmin-guide/ch-raid-intro.html
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch26_:_Linux_Software_RAID
http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html
mdadm - tool for managing Linux Software RAID arrays
http://neil.brown.name/blog/mdadm
Benchmarking RAID configurations
http://www.catux.org/index.php?contingut=articles&num=101
http://www.acnc.com/benchmarks.html
http://www.coker.com.au/bonnie++/
http://www.iozone.org/
http://www.sourcepole.com/sources/reviews/raid/bottom.html
HOWTO Use hdparm to improve IDE device performance - GentooWiki
http://gentoo-wiki.com/HOWTO_Use_hdparm_to_improve_IDE_device_performance
HDparm - Tuning up your IDE hard disks using hdparm.
http://usalug.org/phpBB2/viewtopic.php?p=33142
-GL Art@JAX
--
Art Wildman - NWS JAX FL. - http://www.srh.noaa.gov/jax
"If you choose not to decide, you still have made a choice" -Rush|Freewill
next prev parent reply other threads:[~2006-08-24 20:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-22 2:31 High iowait jassduec
2006-08-22 9:38 ` Lothar Braun
2006-08-23 16:10 ` jassduec
2006-08-24 1:01 ` terry white
2006-08-24 20:06 ` Art Wildman [this message]
2006-08-25 18:59 ` how tell what specific device is sending an interrupt? tom arnall
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