W dniu 2013-07-09 14:55, Victor Zhang pisze:
Hello all,
I am using physical tape drive with high capacity which connect via FICON
director with CPU,there is no virtual tape storage used, data is directly
backed to physical tape drive,my question is how can I determine how much space
used for a given physical cartridge? Does TMS software record this?
The topic is not easy because of compression.
Your TMS (RMM, CA-1, other) should show you both the length (in MB) of
the datasets on the tape as well as total length(in MB) of all data
recorded (all datasets). Due to compression it is ambigous what the last
number mean: is is number of megabytes sent from the host (uncompressed)
or number of megabytes written to the physical tape (compressed)?
And, of course, we cannot predict what the compression ratio will occur
(exactly). Effect - you can assume compression 3:1, record 150% of
physical capacity and have 50% of tape free. Or it can be 30% due to
character of data recorded (worse compression). Or have better
compression and 80% free. Last, but not least the data which are be
appended can have other compression.
For RMM you have the following:
volume usage [kB] - total bytes written to the tape, uncompressed. Can
be more than native capacity.
percent full - how much of physical tape track(s) are in use.
for any dataset: number of blocks x blocksize
For single file tape number_of_blocks x blocksize = volume_usage
--
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Lodz, Poland
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