Dr. Thorsten Brandau wrote (2023/05/26):
> Understanding the parameter helps. Thanks to UDO I could dramatically
> increase the despooling speed.
>
> MaximumFileSize MUST be increased at last with tapes like an LTO. So I have
> set
>
> MaximumFileSize = 54GB
>
> An went from 100-120 MB/s to 260 MB/s.
>
> The default of MaximumFileSize = 1GB, which is too small for LTO drives as
> it seems to get their potential.
Hello, I have noticed this discussion just now.
I did some tests in the past for LTO-3 and LTO-5 and I have also
prepared LTO-6, LTO-7, LTO-M8 and LTO-8 (LTO-7 in LTO-8 drive), but
forgot to finish them :o( Below are results atleast for LTO-5. I think
that you can multiply them proportionally for newer LTO generations.
File Simplified Simplified Bytes Files Rough time to
size fill time fill rate written written read one file
(at 140 MB/s)
1 GB 6:44:18 61.8 MB/s 1498688192512 1499 00:00:07
2 GB 4:51:30 85.7 MB/s 1498737278976 750 00:00:14
4 GB 3:54:57 106.3 MB/s 1498762641408 375 00:00:29
8 GB 3:24:22 122.2 MB/s 1499224932352 188 00:00:57
16 GB 3:11:09 130.7 MB/s 1499456405504 94 00:01:54
32 GB 3:04:35 135.4 MB/s 1499690303488 47 00:03:49
64 GB 3:01:17 137.8 MB/s 1499574960128 24 00:07:37
128 GB 2:59:37 139.1 MB/s 1499603664896 12 00:15:14
And I'm going to return to these tests right now...
--
Rudolf Cejka <cejkar at fit.vut.cz> https://www.fit.vut.cz/~cejkar
Brno University of Technology, Faculty of Information Technology
Bozetechova 1/2, 612 00 Brno, Czech Republic
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