IDE-RAID Drive Performance

From: Nicklas Bondesson
Date: Tue Dec 30 2003 - 05:45:00 EST


Hi!

I think i'm getting really bad values from my disks. It's two Western
Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to a
Promise TX2000 (PDC20271) card (RAID1 using ataraid under Linux 2.4.23).

The disks are setup with hdparm at boot time:

/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda
/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hdc

When running hdparm -tT I get the following:

/dev/hda:
Timing buffer-cache reads: 128 MB in 1.13 seconds =113.27 MB/sec
Timing buffered disk reads: 64 MB in 2.46 seconds = 26.02 MB/sec

/dev/hdc:
Timing buffer-cache reads: 128 MB in 1.13 seconds =113.27 MB/sec
Timing buffered disk reads: 64 MB in 2.47 seconds = 25.91 MB/sec

Are these normal values? I don't think so. Please advise.

/Nicke


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