Networker 7.4SP1 IBM ULT3582 Cartridge 200Gb, and in him it is written down 968Gb!

[jprg]

In library there are 5 cartridges in volume 200Gb. At creation jukebox the utility jbconfig I have specified type of cartridges Ultrim-2. of 5 cartridges are in one to bullet for automatic replacement Networker of a cartridge in case of filling another. At viewing through the console (http://host:9000) and mminfo it is visible that one of cartridges is filled on 100 % and networker continues to write to him. After filling a cartridge on 968Гб networker automatically started to write to other cartridge. How can be if capacity of a cartridge 200Gb, and in him it is written down 968Гб?

mminfo -m
state volume written (%) expires read mounts capacity
MSB107L2 968 GB full 03/25/2009 757 MB 8 190 GB
MSB109L2 0 KB 0% undef 0 KB 6 190 GB
MSB112L2 378 GB 100% 03/26/2009 1515 MB 5 190 GB
MSB113L2 61 GB 32% 03/26/2009 0 KB 12 190 GB
MSB114L2 0 KB 0% undef 0 KB 4 190 GB

nsrjb -v
setting verbosity level to `1'
Jukebox TST1: (Ready to accept commands)
slot volume used pool barcode volume id recyclable
1: MSB107L2 full SAP MSB107L2 2649282725 no
2: MSB112L2 100% SAP MSB112L2 2632505600 no
3: MSB109L2 0% SAP MSB109L2 2615728471 no
4: MSB113L2 32% CS2 MSB113L2 4108915188 no
5: MSB114L2 0% CS2 MSB114L2 3622377193 no
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5 registered volume(s), 3 volumes are less than 80% full.
1731 GB estimated capacity, 322 GB remaining (81% full)
Default slot range(s) are 1-21
drive 1 (/dev/null) slot : disabled
drive 2 (/dev/nst0) slot 1: MSB107L2 (mounted/write protected)

 

[JohanW]

Compression.

I have one LTO-2 tape, 200 GB native, that has 950 GB on it. Some data compresses rather well. Database backups seem to fall in this category.

 

[jprg]

How it is possible to check up, what Nwtworker or library IBM 3582 carries out a compression of the data? And it is possible to disconnect in general for experiment of it?

 

[techmantwo]

First, what kind of compression are you utilizing? OS, Networker directive, or tape drive? You should not use multiple types of compression. You will find that alot of libraries will compress data before writing to tape. Using two types of compression will defeat the purpose of the speed LTO2s are capable of.

And it is Johan posted, the compression fools with Networker and may report 100% but it is not always accurate. Tapes that are truly 100% utilize will report as "full".