Hi list, just installed md yesterday. When setting up partitions I decided to use software raid on the recomendations of some that it can give a good increase in performance. Previously on my other linux installs, taking the hdparm readings as a performance measure, when not using software raid, I would get results around 387mb cache, and 45mb read. The settings I would use on these systems would be hdparm -X68 -c3 -d1 -u1 -m16. Now, when I ran hdparm in md9 (had to install, the distro didn't have it included) with the s/raid, I get results around 330mb cache, and 5.5mb read. BIG performance drop. When trying to set any parameter setting through hdparm, it tells me that it can not use these setting on a scsi device. I presume it is treating the raid dev (md0) as a scsi drive? Where am I going wrong, and how do I increase the performance on this software raid setup. Otherwise I will have to re-install back to the orriginal method. BTW, the hard drives are on separate buses, each with a cdrom as their slave.
thanks Greg p.s. I have migrated from red hat. This is the first time I have tried using md properly. Tried a while back, but could not get networking to work, so gave up.
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