On Thu, Jul 31, 2003 at 06:33:28PM -0600, [EMAIL PROTECTED] wrote: > > > > Maybe not, but they do give a transferspeed from medium range and that > > > is what can be expected. > > > > Hmm, I guess not everyone does that. We have some seagates here at work we > > were wondering about because they seemed too slow, and we couldn't find > > anything aside from what we already knew... the tranfer speed of the > > SCSI interface, which is basically from drive cache to controller. That is > > unless the manufacturers hide the info somewhere so you really have to > > dig, which wouldnt' surprise me. > > Example took me less than 64 seconds to find (for Seagate Barracuda IV): > http://www.seagate.com/cda/products/discsales/personal/family/0,1085,559,00.html > Look for 'Avg. Sustained Transfer Rate'. AFAIK, every manufacturer I know > gives the sustained transfer rate specs (which are sometime a bit too high than > in reality). If the specs are not specified, it'd be very suspicious, and I > would think 128 time before buying such drives. >
The transfer rates are usually given for the outside of the disk I think. Speeds usually drop about 15-20MB/s between the outside and inside. If you've got FreeBSD 5.1, you can use the 'diskinfo -t <disk>' command to measure the performance of the hard drive. It should be a little more accurate than using dd, because I'm guessing the reads/writes don't go through the vfs layer. -- Bruce Cran _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
