Hi Jon,
what's your Maximum File Size setting on the tape device?
The default of 1 GB will not perform very well with recent tape drives,
as it is way too low and flushes the drive buffer far too often.
For encryption/decryption the drives can definitely do this at
line-speed. I haven't seen any performance impact with LTO encryption yet.
Best Regards,
Andreas
Am 10.04.25 um 18:07 schrieb Jon Schewe:
Bruno,
I understand it's a decrypt and decompress, transfer data and then do it
over again. I would hope that the hardware could do encryption and
compression at line rate.
So you're thinking it's hardware and there aren't things I should change
in bareos? I'm assuming that tape to tape copies should not spool, is
that a reasonable assumption?
I'm seeing about 140MB/s on a newer system as well. So wasn't sure if
it's the hba or Linux or bareos or something else.
On Thursday, April 10, 2025 at 9:07:41 AM UTC-5 Bruno Friedmann (bruno-
at-bareos) wrote:
Hi Jon,
The encryption key is set by drive/tape so of course it is not just
copy that block from here to here, it has to be deciphered
uncompressed and then goes the inverse.
From my maths (if correct) it look like you have 142MB/s read/write
which is ~50% of native speed.
Maybe the hba is somewhat limited and can handle more than the
native 300MB/s one way?
On Thursday, 10 April 2025 at 15:16:50 UTC+2 Jon Schewe wrote:
I have 2 LTO-8 drives and I'm executing a copy job from one to
the other. I'm using hardware encryption and compression. I have
spooling turned off because it's tape to tape, so I woudl expect
one could just read from one tape and write to the other. The
source tape has 16TB of raw data. I would expect a tape to tape
copy to be reasonably fast, however I'm finding that after 24
hours I've only seen 12TB copied between the 2 tapes.
Is this just how slow the tapes are? Or is there something I can
reconfigure in bareos to speed this up?
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