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? <blockquote style='border-top: 1px solid rgb(204, 204, 204); margin: 0.8ex 0pt 0pt 0pt; padding-bottom: 1ex;'> ---------[ Received Mail Content ]---------- Subject : [RE] Poorer performance with Raid0 then without? Date : Mon, 1 Jan 2007 11:24:31 -0800 From : "Listbox" <listbox@hymerfania.com> To : <ataraid-list@redhat.com> 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 _______________________________________________ Ataraid-list mailing list Ataraid-list@redhat.com https://www.redhat.com/mailman/listinfo/ataraid-list </BLOCKQUOTE> <div> <hr style="width:85%;margin-left:0px;text-align:left"/> <a href="http://cinema.lycos.com/?if_Event=mail" target="_blank">Free Movies</a> 100's of Free Feature Length Films - Meet Friends, Watch Movies & Win! </div>