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Want more aggressive tape use
2002-11-14 16:59:42
First off: when using server side software compression, does amanda
remember what compression rates it achieved for a filesystem in the past
and use it for estamates in the future? If not, does this seem like a
reasonable thing to try to do?
Just started testing with using software compression on the server
(trying not to impact the clients too much), and got the following result:
Output Size (meg) 27246.3 27246.0 0.2
Original Size (meg) 78571.4 78568.4 3.1
Avg Compressed Size (%) 34.7 34.7 8.0 (level:#disks ...)
Tape Size (meg) 27246.9 27246.1 0.8
Tape Used (%) 68.1 68.1 0.0 (level:#disks ...)
A lot of file systems were not backed up that could have been because
the planner rejected them. I'd like to be able to operate in a mode
where it kept dumping until the tape was full, but then threw away
whatever was left (i.e. - no amflush -> inefficient use of another tape).
Damn, with all these requests it looks like I'm going to have to start
doing some coding :-).
Finally: anyone know how fast of a server is required to compress at
5MB/s? (I'm doing a lot of dumps direct to tape and turning on
compression has incredibly impacted performance)
- Orion
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