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    SubjectRe: RAID 5 performance problems
    Date
    > OK.  We've found a potential issue.  Are the disks being identified as
    > UDMA-33 or UDMA-66/100/133? The performance numbers agree too closely for
    > this to be a coincidence. Check the boot logs.

    I looked into /var/log/dmesg and found this:

    blk: queue c0393144, I/O limit 4095Mb (mask 0xffffffff)
    hda: 39062500 sectors (20000 MB) w/2048KiB Cache, CHS=2431/255/63, UDMA(33)
    blk: queue c03934a8, I/O limit 4095Mb (mask 0xffffffff)
    hdc: 234441648 sectors (120034 MB) w/2048KiB Cache, CHS=232581/16/63,
    UDMA(33)
    blk: queue c039380c, I/O limit 4095Mb (mask 0xffffffff)
    hde: 234441648 sectors (120034 MB) w/2048KiB Cache, CHS=232581/16/63,
    UDMA(33)
    blk: queue c0393b70, I/O limit 4095Mb (mask 0xffffffff)
    hdg: 234441648 sectors (120034 MB) w/2048KiB Cache, CHS=232581/16/63,
    UDMA(33)
    blk: queue c0393ed4, I/O limit 4095Mb (mask 0xffffffff)
    hdi: 234441648 sectors (120034 MB) w/2048KiB Cache, CHS=232581/16/63,
    UDMA(33)
    blk: queue c0394238, I/O limit 4095Mb (mask 0xffffffff)
    hdk: 234441648 sectors (120034 MB) w/2048KiB Cache, CHS=232581/16/63,
    UDMA(33)

    This is what you meant?

    but after the boot I set hdparm manually for each drive with the following
    settings:

    hdparm -a8 -A1 -c1 -d1 -m16 -u1 /dev/hdc.

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