On Thu, 2004-02-19 at 22:46, Chris Kacoroski wrote: > This may be a bit late, but I have ordered a server with 2TB of SATA > drives hooked into a single 3ware card. I will run some tests when I > get it (should be a few weeks) and post them. I am running three servers all using same Intel865 motherboard (if it makes any difference - two of the with 2 gig RAM and one with 1.5 gig) The result of hdparm are below. I could not make out why variation in timing for /dev/mdo and /dev/md1 made across the same two scsi drives in second server. Nor could I make out the difference in timings returned from IDE drives on third server as both are of the same specs. What can I make out of all this? In future what combination to recommend? I feel for cost effectiveness SATA drives may be actually the best. Comments?
Timing from $hdparm -tT: Server one: One SATA drive /dev/hda: Timing buffer-cache reads: 128 MB in 0.28 seconds =457.14 MB/sec Timing buffered disk reads: 64 MB in 1.68 seconds = 38.10 MB/sec Server two: Two SCSI drives in raid0 array /dev/md0: Timing buffer-cache reads: 128 MB in 0.24 seconds =533.33 MB/sec Timing buffered disk reads: 64 MB in 1.33 seconds = 48.12 MB/sec /dev/md1: Timing buffer-cache reads: 128 MB in 0.24 seconds =533.33 MB/sec Timing buffered disk reads: 64 MB in 0.62 seconds = 103.23 MB/sec /dev/sda: Timing buffer-cache reads: 128 MB in 0.23 seconds =556.52 MB/sec Timing buffered disk reads: 64 MB in 0.99 seconds = 64.65 MB/sec /dev/sdb: Timing buffer-cache reads: 128 MB in 0.24 seconds =556.52 MB/sec Timing buffered disk reads: 64 MB in 0.97 seconds = 65.98 MB/sec Server three: Two IDE drives in raid0 array /dev/md0: Timing buffer-cache reads: 128 MB in 0.54 seconds =237.04 MB/sec Timing buffered disk reads: 64 MB in 1.65 seconds = 38.79 MB/sec /dev/md1: Timing buffer-cache reads: 128 MB in 0.53 seconds =241.51 MB/sec Timing buffered disk reads: 64 MB in 1.63 seconds = 39.26 MB/sec /dev/hda: Timing buffer-cache reads: 128 MB in 0.56 seconds =228.57 MB/sec Timing buffered disk reads: 64 MB in 1.23 seconds = 52.03 MB/sec /dev/hdc: Timing buffer-cache reads: 128 MB in 0.58 seconds =220.69 MB/sec Timing buffered disk reads: 64 MB in 2.26 seconds = 28.32 MB/sec -- Sudev Barar Learning Linux ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net