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Re: [Bacula-users] Faster reading of Volumes from disk
2016-02-18 11:34:59
On 2/17/2016 6:07 PM, Dan Langille
wrote:
On Tue, 16 Feb
2016 18:59:10 -0500, Dan Langille said:
As a test, I scp'd over all the volumes for one job and
timed it:
real 167m15.956s
user 117m51.006s
sys 23m56.653s
FWIW, these copies were done while a ZFS scrub was
underway, so if anything, the potential throughput is
higher.
The job above, took nearly 11 hours. Something is up.
I tried another test run, just now, but cancelled it
after the first two Volumes were read; it was going at
about the same rate as the full job mentioned above.
What might account for this vast difference?
You could try profiling it, e.g http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html#DTrace
This is a great idea. Have you done this before? I haven't and
my first attempt seems to be interesting.
It didn't run very long, and thus I'm not sure how
relevant the information is
Interesting, Dan. I wonder what it looks like for that same job with
encryption turned off. If I am reading the graph correctly, it looks
like AES encryption is more than doubling the CPU usage.
To be clear, this was TLS. I just disabled TLS for bacula-sd and ran it again:
I don't know how representative these brief captures are.
-- Dan Langille - BSDCan / PGCon
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