Am 25.01.24 um 10:06 schrieb Marco Gaiarin:
2) checked disk performance (data came only from local disk); i've currently
3 servers, some perform better, some worster, but the best one have a read
disk performance pretty decent, at least 200MB/s on random access (1500 MB/s
on sequential one).
Jim Pollard on private email ask me about controllers: i've not specified,
sorry, but LTO units are connected to a specific SAS controller, not the
disks one.
I'm registred also a lower than expected write performance.
My LTO-6 drive should be handle 160 MB/s uncompressable random data.
By the way mostly bacula said after writing a sequence that the tranfer speed
is mostly round about 80 MB/s.
I've not investigated yet but normally it should go faster. The job is spooled
to /tmp and the swap is not in use. So the Transfer should be much more
faster.
My suggestion now is:
Create a big data-random file as like a spool file in /tmp.
Spool it with dd from tmp to /dev/null
Spool from /dev/random to tape
Spool from /tmp to tape
Any suggestions about bs usage or something else?
Pierre
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