Robert wrote:
Bryan J. Smith wrote:
Robert kerplop@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.
I wasn't complaining, Bryan, simply responding. Actually, having moved from a DAT-2 drive to the USB-connected disk, I'm happy as a pig in sh*t to be able to backup the whole thing unattended and have a reasonable expectation that the resulting wad of crud is good! (I'm still gonna burn /boot, /root, /home and /etc to DVD once a month, though.) Have a great day!
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19 GiB in 36 minutes, I wouldn't be complaining either :-). I'm using DDS-2 & 3, & they are MUCHO slower .... I do also backup across my network to a sorta-spare HDD on another box, but use the DAT tapes for remote storage. I might need to look into a firewire/USB disk for that at those speeds :-).