If any of you have an LTO Ultrium-3 drive what kind of speeds are you observing? On one Linux system here (kernel 2.6.24-19) we have an HP Ultrium-3 attached to an Adaptec ASC-29320ALP U320 controller. There is nothing else on that SCSI bus, termination and cable seem good. Getting into scsi-select from the BIOS shows everything set to 320. No error messages or warnings are appearing. Yet:
dd if=/dev/zero of=/dev/nst0 bs=8192 count=10000 only moves 21.3MB/sec. The HP documentation indicates 432GB/hour, (compressed) which is 120 Mb/sec, so we're off by 6X (or maybe 3X for 2:1 compression, either way, a lot). The system's CPU and memory aren't rate limiting as dd if=/dev/zero of=/dev/null bs=8192 count=10000 moves 6.9GB/sec. Any thoughts where the bottleneck might be? Thanks, David Mathog [EMAIL PROTECTED] Manager, Sequence Analysis Facility, Biology Division, Caltech _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
