Paul Elliott wrote (2015/12/02):
> I would be interested to hear what block sizes other LTO5/6 users are
> using?
LTO-5/SAS on FreeBSD: I still use Maximum Block Size = 65536, because
333 MB/s transfer rate is sufficient for me. I have tried this small
script
---
#!/bin/sh
B=131072
C=32768
while [ $B -ge 1024 ]; do
dd if=/dev/zero of=/dev/nsa1 bs=$B count=$C
B=$(( $B / 2 ))
C=$(( $C * 2 ))
done
---
with iostat in another terminal window:
tty sa0 sa1 cpu
tin tout KB/t tps MB/s KB/t tps MB/s us ni sy in id
...
0 60 0.00 0 0.00 128.00 3073 384.18 0 0 1 0 99
...
0 59 0.00 0 0.00 64.00 5325 332.84 0 0 1 0 99
...
0 63 0.00 0 0.00 32.00 7834 244.82 0 0 1 0 98
...
0 64 0.00 0 0.00 16.00 11328 177.00 0 0 2 0 98
...
0 60 0.00 0 0.00 8.00 14521 113.45 0 0 2 0 98
...
0 63 0.00 0 0.00 4.00 16534 64.58 0 0 1 1 98
...
0 63 0.00 0 0.00 4.00 16534 64.58 0 0 1 1 98
...
0 61 0.00 0 0.00 2.00 17723 34.62 0 0 2 1 98
...
0 60 0.00 0 0.00 1.00 18513 18.08 0 0 2 1 97
> What's the advantage of the maximum job spool size setting? We're not
> using any spooling at the moment so I'm interesting in what parameters
> would be best for our setup. (if any..)
If you have more parallel jobs, full spool space means that all spooling
jobs have to be paused until something is despooled. With Maximum Job
Spool Size set to Maximum Spool Size / number of parallel jobs you can
prevent this situation.
--
Rudolf Cejka <cejkar at fit.vutbr.cz> http://www.fit.vutbr.cz/~cejkar
Brno University of Technology, Faculty of Information Technology
Bozetechova 2, 612 66 Brno, Czech Republic
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