Hello,
Nice. That is very good throughput. Thanks for reporting your
results ...
Best regards,
Kern
On 5/5/21 7:05 AM, fk+bacula--- via
Bacula-users wrote:
I
have found the solution:
There
I have found the solution:
There was a cooling issue inside the server which mounts the LTO drive.
A fan wasn't working. The higher temperature slows down the drive drive
speed.
Now I have backed up:
Despooling elapsed time = 00:39:31, Transfer rate = 285.3 M Bytes/second
Using 20 GB file
Hi,
The speed test is not to the tape but to and from the spool drive only.
The transfer rates are from real data (audio files).
HTH
Am 26.04.21 um 16:17 schrieb Kern Sibbald:
Hello,
If you are sending blocks of zeros to a tape drive, it is useless to
compare speeds to anything that sends
Hello,
If you are sending blocks of zeros to a tape drive, it is useless to
compare speeds to anything that sends real data. Zero data input to
most tape drives is almost completely optimized (compressed) out, so
one gets very large, unrealistic speeds. Try
In regard to possible compression 360MB/sec seems slow for a spool drive
serving an LTO-7. This is data from an 8 drive RAID 6 DELL box (PERC730P):
root@pangaea:~# dd if=/dev/zero of=/dev/null bs=1M count=32000
33554432000 bytes (34 GB, 31 GiB) copied, 1.89847 s, 17.7 GB/s
root@pangaea:~# dd
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Sent: April 21, 2021 10:20 AM
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Subject: Re: [Bacula-users] LTO-7 btape speed test
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Thanks Kern,
I will ask Quantum about the best setting for the Block Size.
The file size I have set to 20 GB at the moment.
Thanks, Frank
Am 21.04.2021 um 12:09 schrieb Kern Sibbald:
From my experience (up to LTO-5), using 524288 as a block size is a
reasonable size. However LTO-7 drives are
Hello,
From my experience (up to LTO-5), using 524288 as a block size is a
reasonable size. However LTO-7 drives are even faster, so you might
try some tests with Maximum block size = 1048576. Some people
recommend much larger sizes, but in my tests (LTO-5) there
Hello there,
I'm using a Quantum LTO-7 HH drive with Ultrium LTO-7 tapes.
The streamer is connected on a SAS HAB microsemi 1100-4i.
I set the Maximum block size = 524288
and run: speed file_size=3 skip_raw
with zero data and bacula block structure Total Write rate = *311.7 MB/s*
with random
