Tape occupancy exceeds capacity defined

General Discussion
1

Hello,

Should occupancy of a tape exceed the capacity defined?

devdb13=# select media_type_name, capacity_in_bytes from media_type;
 media_type_name | capacity_in_bytes
-----------------+-------------------
 3592JE20T       |    20000000000000
(1 row)

devdb13=# select is_full, data_in_bytes from tape where vid = 'J01386';
 is_full | data_in_bytes
---------+----------------
 0       | 20619608915005

thanks,
Mwai

2

Hi Mwai,

yes that is expected if the data is (highly) compressible.

We have several use cases where we have >20 TB of data on 7 TB 3592JC tape cartridge.

Best regards,

Vladimir Bahyl

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