Gimili <gimili17 AT gmail DOT com> wrote on 12/21/2010
01:28:27 PM:
> How do I restore 200GB fast? I have googled but can't find any
> simple tips/steps. I did the rsync restore but it seems to be
> taking forever so I cancelled it. Now I am downloading the tar
at
> 10mb/s which it taking a long time.
>
> Any tips or advice much appreciated.
>
> How long should this take using 1000nics?
Gigabit NICs should be able to move roughly 70MB/s
*IF* everything else can handle that: backup computer's hard drive,
CPU and RAM; network switch; destination hard drive, CPU and
RAM. (Yes, theoretically it should be more, but good luck with getting
that outside of the lab.) If you're talking a single IDE spindle
talking to a single IDE spindle, it's usually more like 30MB/s. 10MB/s
seems low, but not terribly unusual, sadly.
Tar's needs are pretty low, but if the pool is compressed
(or if you selected a compressed TAR), that could make a big difference.
Rsync isn't going to give you any performance boost on a restore,
assuming you're restoring to an empty folder: *nothing* is going
to give you a performance boost, really. You're simply going to have
to wait.
Even at 10MB/s (you wrote "mb/s", which
is wrong either way, but I'm assuming you meant MegaBYTES per second, not
MegaBITS per second), it will only take about 6 hours to restore. By
the time you figure out how to make it faster, it'll probably already be
done!
Not to make you feel worse, but this is why you fully
test a backup system INCLUDING FULL RESTORES before you put it into production.
I like to say you don't have a backup until you restore that backup.
Taking the backup is only half the process...
Something to think about when it comes to cloud-based
backups. We all know that with the magic of pooling and rsync, the
first backup might take a week, but future backups will only take a few
minutes. Unfortunately, that first *restore* is going to take a week,
too... Can you wait that long?
Timothy J. Massey
Out of the Box Solutions, Inc.
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