On 09/23/2014 08:31 PM, jd1008 wrote: > So, how can I ascertain if I am getting much better transfer (read/write) > speeds without doing io from one unmounted partition of drive A to an unmounted > partition on disk B? > Usually I use dd with bs=512M or 256M (in case I have a lot of programs running). > I have seen 65 mbytes/s, but that is achievable even with UDMA133 PATA drives spinning > at 7200rpm. Try hdparm -t /dev/sda (if your drive is sda) this will do a speed test reading the first part of the disk. Consider that: - the beginning of the disk is faster then the final part (which can be about half speed) - normal drives have actual physical speed from 50MB/s to 200MB/s, even if the SATA link permits a faster speed - your drive is a "WD Green", which are generally quite slow, do not expect spectacular numbers Finally, if you get significantly slower numbers for /dev/sda1 with respect to /dev/sda, maybe your partitions are not well 4k aligned (this happens when the partitioning tool is too old). -- Roberto Ragusa mail at robertoragusa.it -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
