So the dma settings are normal. My only other thought is what do you have on /dev/hdf? Is that drive a slave with /dev/hde as the master? Can you run the system with hde and hdg but without hdf and see if the raid0 performance improves?
---------[ Received Mail Content ]----------
Subject : [RE] Poorer performance with Raid0 then without?
Date : Mon, 1 Jan 2007 11:24:31 -0800
From : "Listbox" <listbox@xxxxxxxxxxxxxx>
To : <ataraid-list@xxxxxxxxxx>
Here is more hdparm data. It looks like bad news.
Note: for whatever reason, /dev/md0 does not seem to be my RAID device. I
set up my raid (via trial and error) with dmraid, and it gave me
/dev/mapper/sil_agbgdgbjfhei. I have always felt there was something
not-right about that.
Second, the errors hdparm reports from -tT look significant.
Finally, "Timing cached reads" are much lower then single drives. I don't
know what this really means in a RAID context.
I tried removing the third drive on the board (primary slave), no effect.
Anyway, given the errors, is this a RAID software problem, or a piece of
junk RAID adapter card?
Thanks so much, folks.
Listbox
* * * * * * * * * * *
* * * * * * * * * * *
/dev/hde:
multcount = 16 (on)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 19457/255/63, sectors = 312581808, start = 0
/dev/hdg:
multcount = 16 (on)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 19457/255/63, sectors = 312581808, start = 0
* * * * * * * * * * *
* * * * * * * * * * *
hprarm -tT /dev/md0
read() hit EOF - device too small
/dev/md0:
Timing buffered disk reads: read() hit EOF - device too small
BLKFLSBUF failed: No such device
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: No such device
hprarm -tT /dev/mapper/sil_agbgdgbjfhei
/dev/mapper/sil_agbgdgbjfhei:
Timing cached reads: HDIO_DRIVE_CMD(null) (wait for flush complete)
failed: Inappropriate ioctl for device
1288 MB in 2.00 seconds = 643.22 MB/sec
Timing buffered disk reads: HDIO_DRIVE_CMD(null) (wait for flush complete)
failed: Inappropriate ioctl for device
284 MB in 3.01 seconds = 94.27 MB/sec
* * * * * * * * * * *
* * * * * * * * * * *
* * * * * * * * * * *
* * * * * * * * * * *
dev/hda:
Timing cached reads: 1668 MB in 2.00 seconds = 834.10 MB/sec
Timing buffered disk reads: 88 MB in 3.05 seconds = 28.87 MB/sec
/dev/hdb:
Timing buffered disk reads:
/dev/hdc:
Timing cached reads: 1696 MB in 2.00 seconds = 847.36 MB/sec
Timing buffered disk reads: 88 MB in 3.05 seconds = 28.82 MB/sec
/dev/hde:
Timing cached reads: 1680 MB in 2.00 seconds = 838.49 MB/sec
Timing buffered disk reads: 168 MB in 3.03 seconds = 55.46 MB/sec
/dev/hdf:
Timing cached reads: 1688 MB in 2.00 seconds = 843.57 MB/sec
Timing buffered disk reads: 164 MB in 3.00 seconds = 54.59 MB/sec
/dev/hdg:
Timing cached reads: 1696 MB in 2.00 seconds = 846.68 MB/sec
Timing buffered disk reads: 162 MB in 3.03 seconds = 53.45 MB/sec
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