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<DIV dir=ltr align=left><SPAN class=066442801-02012007><FONT face=Arial
color=#0000ff size=2>Yeah, that's what I did that I described
as</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=066442801-02012007><FONT face=Arial
color=#0000ff size=2>"<FONT face="Times New Roman" color=#000000 size=3>I tried
removing the third drive on the board (primary slave), no effect.
</FONT>"</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=066442801-02012007><FONT face=Arial
color=#0000ff size=2>This smells like a driver/software problem. I'd like to try
a different setup.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=066442801-02012007><FONT face=Arial
color=#0000ff size=2>Is there some way to use "md type" RAID that uses
/dev/md? instead of "dm type" RAID that uses /dev/mapper/*?</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=066442801-02012007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=066442801-02012007><FONT face=Arial
color=#0000ff size=2>Thanks!</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=066442801-02012007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=066442801-02012007><FONT face=Arial
color=#0000ff size=2>Listbox</FONT></SPAN></DIV>
<DIV dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> James Olson
[mailto:big_spender12@lycos.com] <BR><B>Sent:</B> Monday, January 01, 2007 5:15
PM<BR><B>To:</B> ATARAID (eg, Promise Fasttrak, Highpoint 370) related
discussions<BR><B>Subject:</B> [RE] Poorer performance with Raid0 then
without?<BR></FONT><BR></DIV>
<DIV></DIV>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? <BR><BR><BR><BR><BR><BR>
<BLOCKQUOTE
style="BORDER-TOP: rgb(204,204,204) 1px solid; PADDING-BOTTOM: 1ex; MARGIN: 0.8ex 0pt 0pt"><BR>---------[
Received Mail Content ]----------<BR><BR><B>Subject : </B>[RE] Poorer
performance with Raid0 then without?<BR><BR><B>Date : </B>Mon, 1 Jan 2007
11:24:31 -0800<BR><BR><B>From : </B>"Listbox"
<listbox@hymerfania.com><BR><BR><B>To :
</B><ataraid-list@redhat.com><BR><BR><BR><BR>Here is more hdparm data.
It looks like bad news. <BR><BR><BR><BR>Note: for whatever reason, /dev/md0
does not seem to be my RAID device. I <BR><BR>set up my raid (via trial and
error) with dmraid, and it gave me <BR><BR>/dev/mapper/sil_agbgdgbjfhei. I
have always felt there was something <BR><BR>not-right about that.
<BR><BR>Second, the errors hdparm reports from -tT look significant.
<BR><BR>Finally, "Timing cached reads" are much lower then single drives. I
don't <BR><BR>know what this really means in a RAID context. <BR><BR><BR><BR>I
tried removing the third drive on the board (primary slave), no effect.
<BR><BR><BR><BR>Anyway, given the errors, is this a RAID software problem, or
a piece of <BR><BR>junk RAID adapter card? <BR><BR><BR><BR>Thanks so much,
folks. <BR><BR><BR><BR>Listbox <BR><BR>* * * * * * * * * * * <BR><BR>* * * * *
* * * * * * <BR><BR><BR><BR>/dev/hde: <BR><BR>multcount = 16 (on)
<BR><BR>IO_support = 0 (default 16-bit) <BR><BR>unmaskirq = 0 (off)
<BR><BR>using_dma = 1 (on) <BR><BR>keepsettings = 0 (off) <BR><BR>readonly = 0
(off) <BR><BR>readahead = 256 (on) <BR><BR>geometry = 19457/255/63, sectors =
312581808, start = 0 <BR><BR><BR><BR>/dev/hdg: <BR><BR>multcount = 16 (on)
<BR><BR>IO_support = 0 (default 16-bit) <BR><BR>unmaskirq = 0 (off)
<BR><BR>using_dma = 1 (on) <BR><BR>keepsettings = 0 (off) <BR><BR>readonly = 0
(off) <BR><BR>readahead = 256 (on) <BR><BR>geometry = 19457/255/63, sectors =
312581808, start = 0 <BR><BR><BR><BR>* * * * * * * * * * * <BR><BR>* * * * * *
* * * * * <BR><BR><BR><BR><BR><BR>hprarm -tT /dev/md0 <BR><BR>read() hit EOF -
device too small <BR><BR><BR><BR>/dev/md0: <BR><BR>Timing buffered disk reads:
read() hit EOF - device too small <BR><BR>BLKFLSBUF failed: No such device
<BR><BR>HDIO_DRIVE_CMD(null) (wait for flush complete) failed: No such device
<BR><BR><BR><BR>hprarm -tT /dev/mapper/sil_agbgdgbjfhei
<BR><BR>/dev/mapper/sil_agbgdgbjfhei: <BR><BR>Timing cached reads:
HDIO_DRIVE_CMD(null) (wait for flush complete) <BR><BR>failed: Inappropriate
ioctl for device <BR><BR>1288 MB in 2.00 seconds = 643.22 MB/sec
<BR><BR>Timing buffered disk reads: HDIO_DRIVE_CMD(null) (wait for flush
complete) <BR><BR>failed: Inappropriate ioctl for device <BR><BR>284 MB in
3.01 seconds = 94.27 MB/sec <BR><BR>* * * * * * * * * * * <BR><BR>* * * * * *
* * * * * <BR><BR>* * * * * * * * * * * <BR><BR>* * * * * * * * * * *
<BR><BR>dev/hda: <BR><BR>Timing cached reads: 1668 MB in 2.00 seconds = 834.10
MB/sec <BR><BR>Timing buffered disk reads: 88 MB in 3.05 seconds = 28.87
MB/sec <BR><BR><BR><BR>/dev/hdb: <BR><BR>Timing buffered disk reads:
<BR><BR>/dev/hdc: <BR><BR>Timing cached reads: 1696 MB in 2.00 seconds =
847.36 MB/sec <BR><BR>Timing buffered disk reads: 88 MB in 3.05 seconds =
28.82 MB/sec <BR><BR><BR><BR>/dev/hde: <BR><BR>Timing cached reads: 1680 MB in
2.00 seconds = 838.49 MB/sec <BR><BR>Timing buffered disk reads: 168 MB in
3.03 seconds = 55.46 MB/sec <BR><BR><BR><BR>/dev/hdf: <BR><BR>Timing cached
reads: 1688 MB in 2.00 seconds = 843.57 MB/sec <BR><BR>Timing buffered disk
reads: 164 MB in 3.00 seconds = 54.59 MB/sec <BR><BR><BR><BR>/dev/hdg:
<BR><BR>Timing cached reads: 1696 MB in 2.00 seconds = 846.68 MB/sec
<BR><BR>Timing buffered disk reads: 162 MB in 3.03 seconds = 53.45 MB/sec
<BR><BR><BR><BR>_______________________________________________
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<BR><BR><BR><BR></BLOCKQUOTE><BR>
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