I use a home-brew backup script that basically loops through some
directories, grabbing a wad of files, tar/gzip them up, and FTP the
result to a distant server. To minimize space footprint, it deletes
the file after FTP finishes, but it's a very primitive setup-- no error
catching and retrying.
Normally, the script runs as a cron job, but I wanted to trigger it
manually today.
So from the command-line, I start the script.
Obviously, I forget to do it in the background, so I end up having to
control-z and "bg" it.
And that leaves it on my jobs stack, so occasionally, I 'fg' one time
too many and end up re-suspending-and-backgrounding it.
My concern is: what impact could this have on the reliability of the
transfer?
If it stops in the middle of tar/gzip, it will obviously resume, but if
I stop while it's in the middle of FTPing, what could go wrong?
I could see two possibilities:
1- If I left it for a while instead of a few panicked seconds, it
would timeout and drop the connection, ending FTP and moving on to the
next file. This would result in a lost file.
2- It might hiccup, corrupting the file. Equally bad if not worse.
I'm assuming that packet checksums and serial numbers (flashing back to
CSE420 :) ) make this unlikely.
If I check the recipient side and it's uploaded a file of the correct
size and date, can I assume that it's also uploaded an intact file?
(the script forces binary mode FTP, so it's unlikely we'd have problems
with CR-LF conversion)
Since the script takes 8-12 hours to run (and produces, among its
output, a 5.6G .tar.gz file and several in excess of 1G), I'd prefer to
not have to either re-run the script or download the results to ensure
correct function.
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