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Re: Amanda and dual tape libraries.
2009-05-14 17:27:17
McGraw, Robert P wrote:
Chris,
Thanks for your input.
I am using a 38 slot StorEdge C4 unit and one LTO2 tape drive.
See some answers below.
I just was looking to see if this is or could be done and if so how. With the virtual tape array maybe this will be mute.
-----Original Message-----
From: owner-amanda-users AT amanda DOT org [mailto:owner-amanda-
users AT amanda DOT org] On Behalf Of Chris Hoogendyk
Sent: Thursday, May 14, 2009 12:53 PM
To: amanda-users AT amanda DOT org
Subject: Re: Amanda and dual tape libraries.
Do your backup reports indicate that the taping speed is the
bottleneck?
[McGraw, Robert P]
My tape write speed is very close to the max for the LTO unit.
So the Amanda report gives you a tape write speed that looks good.
But what about the Tape Time vs. Dump Time in the Amanda email report?
For example, my report shows me an Avg Tp Write Rate that approaches
what my drive is capable of. But, it also shows me a Tape Time of 1:24
and a Dump Time of 13:23. So, I'm somewhere around 1/10 of the backup
period writing to tape (while still doing backups), and 9/10 of the
backup period the tape is idle.
Are you writing several tapes a night?
--
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Chris Hoogendyk
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O__ ---- Systems Administrator
c/ /'_ --- Biology & Geology Departments
(*) \(*) -- 140 Morrill Science Center
~~~~~~~~~~ - University of Massachusetts, Amherst
<hoogendyk AT bio.umass DOT edu>
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Erdös 4
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