Thanks. I noticed your blocksize... I may need to experiment more with that.
So far I've not been able to turn drive HW compression off... though I'm happy
to use it in production as opposed to software compression.
-
David Simpson - Senior Systems Engineer
ARCCA, Redwood Building,
What tweaks did you do?
Yes, should of mentioned the server is dedicated for this purpose and is
reasonably resourced:
-dedicated SAS card for tape drives
-64GB RAM
-2x Xeon E5-2640 v3, so plenty of cores
-dedicated holding disk areas (RAID6) .. two of these coming in at approx.
32.7TB, which
Here's mine:
define tapetype LTO8-compoff {
comment "Created by amtapetype; compression disabled"
comment "/usr/sbin/amtapetype -f -b 1024k /dev/nst2"
length 11732915200 kbytes
filemark 5006 kbytes
speed 172710 kps
blocksize 1024 kbytes
}
It's an FC drive on a Dell ML3
You should get substantially faster. That said, throughput to the tape will depend on a lot of
things about your system and where the bottleneck actually is. The maximum throughput of dual SAS2
is 6Gbit/s, which would be 750MB/s. So, you aren't likely to come close to the 900MB/s for
Just ran amtapetype against an LTO8 tape + HP MSL3040 (with SAS drives). Debian
11.
Some observations:
-compression on, expected
-length looks ok
-speed .. should I have expected more? Seemed a bit low I thought..
-no LEOM.. I don't know if it's the hardware or the Debian 11 kernel or both,
