On 11/16 10:42 , Les Mikesell wrote:
> Even when rsync does a full, it just sends the filename list, then
> exchanges block checksums over the files that already match. This
> may take a long time but it uses very little bandwidth for the
> unchanged files.
unfortunately, it seems that if the last (rsync) backup was an incremental,
the next full (rsync) backup won't use those already transferred files. I
moved 8GB of files over a T1 recently, but the transfer was done as an
incremental backup. I realized that the next backup was going to be an
incremental as well, and again likely transfer all those files; so I forced
it to be a full backup with:
$Conf{FullPeriod} = .80;
(blackouts keep it from running more than once a day; but this also seems to
force it to the head of the queue for backups, so it starts as soon as the
blackouts end instead of waiting for others).
Unfortunately, it transferred all that data over again, taking another 40
hours (!). I know it's not the data changing, because the most recent full
backup only took 200 minutes.
I had thought that having a hash-locatable copy of the file in the cpool
would keep an identical file from being transferred again. Can someone
explain why this doesn't happen?
> And you can add the -C option to the ssh
> command to save more.
This option really should be mentioned in the notes in the config.pl file.
For old machines with slow CPU and lots of bandwidth it might not be
worthwhile; but for fast machines with slow links, it would be worth
reminding us of it. :)
In my copious spare time I should try to determine at which point this
becomes a worthwhile option to employ.
AFAIK, File:RsyncP does not allow compression. (someone please correct me if
I'm wrong). I wonder if a command could be concocted which piped the rsync
stream through a compression tool (bzip2? 7zip?) which offered better
compression than ssh -C.
--
Carl Soderstrom
Systems Administrator
Real-Time Enterprises
www.real-time.com
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