Just as a test, configure the 14 disks as JBOD and create a software RAID. See if it is faster. >From what I have seen software RAID is very fast compared to hardware RAID. But my hardware RAID exposure is old, but so is my Linux box I guess. Guy -----Original Message----- From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Ben Sent: Friday, June 11, 2004 9:50 PM To: linux-raid@xxxxxxxxxxxxxxx Subject: DAC960 2.6.6 Question Hello, I've been having some performance problems with hardware raid. I've tired 4 different cards, two of them have been confirmed to have issues with either the hardware or the driver (a dell perc 3/qc was hardware and the other was using the aacraid driver which has performace issues). I currently have a Mylex eXtremeRaid 2000 in the box I'm testing. I have a total of 14 drives in a raid 5 configuration (1 of which is a hotspare) over all 4 channels. I can not for the life of me get more then 60-70MB/s write and 70-80MB/s read. Considering this is over 4 channels and in a 66MHz PCI slot I should be seeing a lot more. I've been playing with the ioschedular in 2.6.6 using all types of values in the /sys/block/rd*/queues/iosched/* files. Tried going back to deadlock and playing with the AS scheduler, etc.. Nothing will get it up to par of where it should be. Is this a problem with linux in general and hardware raid support or am I simply doing something wrong? I've been fighting with this for a few weeks now and am completely out of ideas. I find it hard to believe that linux doesn't do more then 100MB/s on hardware raid, otherwise no one would use the hardware raid :) Thanks, Ben -- Systems Administrator Easynews, Inc. Usenet Made Easy! http://www.easynews.com - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
