Oops, I should have sent my reply to the list.
On Fri, 28 Jan 2011 16:35:05 -0500
Joe Konecny <jkonecny < at > rmtohio.com> wrote:
On 1/28/2011 2:11 PM, Charles Curley wrote:
For now, with 100 GB of data going to a 1 TB hard drive, you can
probably back up to that hard drive. But not for long. Two caveats:
* Having your data, holding disk, and vtapes all on the same drive
will result in lots of disk drive thrashing. Ideally, have each on
their own drive. Short of that, eventually go to a separate drive
for the vtapes.
My data would be on a different server than the vtapes. Does a
holding disk make a big difference if you are using vtapes?
Yes. vtapes emulate a tape to the point that amanda won't write to them
in parallel, just as it cannot write to a tape in parallel. A holding
disk lets amanda always have one or more DLEs ready to go to the tape.
While shoe-shining obviously isn't an issue with vtapes, that one DLE at
a time requirement is a bottleneck.
There is an effort to allow one configuration to write to multiple tape
drives (including vtapes), but I don't know its status. That might move
things along fast enough to reduce the need for a holding disk, but I
haven't played with it.
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