Hi, after doing the "dd" tests for a server we have at work I obtained: Read: 47.20 Mb/s Write: 39.82 Mb/s Some days ago read performance was around 20Mb/s due to no readahead in md0 so I modified it using hdparm. However, it seems to me that being it a RAID1 read speed could be much better. These are SATA disks with 3Gb of RAM so I did 'time bash -c "dd if=/dev/zero of=bigfile bs=8k count=786432 && sync"'. File system is ext3 (if read many times in the list that XFS is faster), but I don't want to change the file system right now. Modifing the readahead from the current 1024k to 2048k doesn't make any difference. Are there any other tweaks I can make?
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