On 05/12/2015 01:50 PM, Alex Domoradov wrote:
>> Where's 23MB/s come from?
> from bacula-web - http://i.imgur.com/pEQwCvI.png
>
>> I get 200+MB/s on disk writes to raidz zfs backed by cheap "desktop"
> drives
> It would depend on "type" of files as I understood. I have a lot (~11M) of
> small files 20-50 Kbyte. So I don't believe that you can get 200 Mb/s on
> such small files ;)
Yeah, OK. I see thing like
> 1-May 20:05 starfish-sd JobId 7: Committing spooled data to Volume
> "BMRB-0001". Despooling 54,630,677 bytes ...
> 11-May 20:05 starfish-sd JobId 7: Despooling elapsed time = 00:00:01,
> Transfer rate = 54.63 M Bytes/second
> 11-May 20:05 starfish-sd JobId 7: Elapsed time=00:00:08, Transfer rate=6.791
> M Bytes/second
in the log and I've no idea what any of it means: the spool is a
mirrored ssd so "6.791 M Bytes/second" is not the disk write speed. The
"54.63 M Bytes/second" just means "I despooled everything I had in a
second or less". On large sets where it despools the entire 50GB file
volume, reported ssd to spinning rust speed is
> 12-May 00:29 starfish-sd JobId 13: Writing spooled data to Volume. Despooling
> 49,807,364,491 bytes ...
> 12-May 00:31 starfish-sd JobId 13: End of medium on Volume "BMRB-0002"
> Bytes=49,807,326,888 Blocks=772,063 at 12-May-2015 00:31.
> 12-May 00:31 starfish-sd JobId 13: Despooling elapsed time = 00:02:26,
> Transfer rate = 341.1 M Bytes/second
-- that does sound reasonable.
Anyway, I'd say your initial tls overhead was due to slow cipher and you
shouldn't have a problem setting things up so that encryption overhead
is masked out by the storage write speed or the rate the clients can
produce the data or whatever the current bottleneck is.
--
Dimitri Maziuk
Programmer/sysadmin
BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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