On 02/06/2010 06:28 PM, Robert Nichols wrote: > Robert Nichols wrote: > >> Paolo Galtieri wrote: >> >>> I tried to copy a file from my hard disk to a USB flash drive using drag >>> and drop and the nautilus file manager. When I did this a file >>> operations window popped up showing progress of the copy. It stopped at >>> 245.5Mb of 278.6Mb, however, when you look at the destination file it is >>> in fact all there. Doing an md5sum of the source file and the >>> destination file shows them to be the same. I removed the destination >>> file and tried the copy again, and this time it stopped at 246.5Mb of >>> 278.6Mb. If I try to unmount the USB drive it fails with volume is >>> busy, even though the file has been copied over completely. If I try to >>> force the unmount it fails with volume busy. Eventually (after about 5 >>> minutes) it seems to finally recognize that the copy is complete and >>> allows me to unmount the drive. If the file has completed copying why >>> does the nautilus file operation popup take a long time before it goes away? >>> >>> No matter how many times I do the copy the nautilus file operation popup >>> takes several minutes to report completion. >>> >>> I'm running F12 with all the latest updates. >>> >> Nautilus is waiting for fsync() to return, indicating that the data has >> actually been written to the device. Unmounting is similarly waiting for >> the writes to complete. When you think you are looking at the file on >> the device, all you are really seeing is the data in the kernel's buffer >> cache. Writes to USB drives max out at around 30MB/s, so you should >> expect it to take 9 minutes or more to transfer that 278MB file. >> > That calculation, of course, makes no sense. At 30MB/s a 278MB transfer > would take 9.2 _seconds_, not 9 minutes. However, USB flash drives do not > achieve anywhere near 30MB/s for writes. Five or 6 minutes is a quite > likely time for a 278MB transfer to most commonly available flash drives. > > what's interesting is that the first 240+Mb take seconds. it's the last 30Mb that seem to take forever, i.e. the progress bar displays the first 240+Mb almost immediately and then it stops. I would expect the write itself should take seconds, but the sync to the drive, which doesn't occur until you eject the drive, should take more time. Paolo -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
