My new IBM LTO9 tape unit have a data sheet performace of:
https://www.ibm.com/docs/it/ts4500-tape-library/1.10.0?topic=performance-lto-specifications
so on worst case (compression disabled) seems to perform 400 MB/s on an LTO9
tape.
Practically on Bacula i get 70-80 MB/s. I've just:
1) followed:
https://www.bacula.org/9.6.x-manuals/en/problems/Testing_Your_Tape_Drive_Wit.html#SECTION00422000000000000000
getting 237.7 MB/s on random data (worst case).
2) checked disk performance (data came only from local disk); i've currently
3 servers, some perform better, some worster, but the best one have a read
disk performance pretty decent, at least 200MB/s on random access (1500 MB/s
on sequential one).
3) disabled data spooling, of course; as just stated, data came only from
local disks. Enabled attribute spooling.
Clearly i can expect some performance penalty on Bacula and mixed files, but
really 70MB/s are slow...
What else can i tackle with?
Thanks.
--
If you hear something late at night
some kind of trouble, some kind of fight
just don't ask me what it was (S. Vega)
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