[CentOS] slow usb hard disk performance.
Bryan J. Smith
thebs413 at earthlink.net
Mon Dec 5 16:58:08 UTC 2005
Robert <kerplop at sbcglobal.net> wrote:
> for dir in bin boot etc home initrd lib lost+found misc
> opt root \
> sbin selinux srv tftpboot \
> usr var ; do
> find /$dir -depth -print0 | cpio --null -pmd $UD/$DT
> echo `date` Completed: /$dir >>$PF
> done
That's not a good benchmark. You're adding the overhead of
inode/tree traversal and all sorts of other factors. You're
easily cutting performance by 2-3x over.
Since USB 2.0 EHCI is capable of only 60MBps (480Mbps)
theoretical, and Intel openly admits that only 30MBps is
realistic, 8.8MBps is not unreasonable for this command.
Try a "raw" dd from /dev/zero, that is at least 2x your
memory:
dd if=/dev/zero of=(some file) bs=8M count=1000
Or consider a bonnie benchmark.
--
Bryan J. Smith | Sent from Yahoo Mail
mailto:b.j.smith at ieee.org | (please excuse any
http://thebs413.blogspot.com/ | missing headers)
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