Problem using rsync to back up large files to external harddrive
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hangs on large files. By 'large', I only mean files < 100MB. (so not so large). Killing rsync usually works, but then when I do an 'ls' on on mounted file system, even 'ls' hangs. Eventually my whole system gets stuck.
Simply copying the offending files (e.g. data000.hdf5) to the externally mounted disk works instanteonously.
I am copying to the Lacie drive over USB (via a 6 foot extension cable).
Are there any known problems with rsync that might explain this?
not with rsync that I am aware of. I backup files that are over 250 MB up to and including some multi GB .iso images to my External USB/Firewire drive (yes Ii alternate which connection it's using at times.) using rsync and have not had the issue you are describing.
It is by nomeans a fast process, I run it at off hours so I'm not sitting there watching it or waiting for it to finish
I have had problems with LaCie drives (their early ones, I do not have a "Quadra"): They look good, but don't always work well. (I had two - one is reliable, the other NOT - it sometimes hung, like yours does, so the enclosure, but not the disk, eventually went to the dump).
6foot for "high speed" USB may be stretching things. Have you tried using a shorter (or just a different) cable ?
Any useful errors in /var/log/messages ?
rsync has always worked perfectly for me, so I don't think the problem lies there.
The USB 2.0 specification states the maximum cable length is 5m (16.4ft) but maybe you just had a bad cable, or there were timing issues with the LaCie. The only way to find out is by trying different cables and testing their performance.