Re: High iowait
Art Wildman <[email protected]>
| Newsgroups | gmane.linux.configuration,gmane.linux.admin |
|---|---|
| Organization | National Weather Service, WFO-JAX |
| Message-ID | <[email protected]> |
[email protected] 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 - To unsubscribe from this list: send the line "unsubscribe linux-config" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html