Christian Gaul wrote:
> Am 11.08.2010 16:49, schrieb Hugo Silva:
>> Thomas Mueller wrote:
>>
>>> Am Tue, 10 Aug 2010 15:13:07 +0100 schrieb Hugo Silva:
>>>
>>>
>>>> Hello,
>>>>
>>>> I'm backing up a server in Germany from a director in The Netherlands.
>>>> Using bacula, I can't seem to get past ~3000KB/s.
>>>>
>>>> Here's an iperf result:
>>>> [ 3] local [fd-addr] port 16625 connected with [dir-addr] port 5001 [
>>>> ID] Interval Transfer Bandwidth [ 3] 0.0-10.1 sec 110
>>>> MBytes 91.2 Mbits/sec
>>>>
>>> you speak of a server in germany and director in netherlands. the sd is
>>> also on the director machine. fd sends data to sd directly - could also be
>>> a routing issue.
>>>
>>> and: as in many other threads mentioned, backing up a filesystem with
>>> thounds or millions of files can't be compared to a sequential read with
>>> dd.
>>>
>>> and: did you ran the btape tests on the sd to check the performance?
>>>
>>>
>>> - Thomas
>>>
>> Hi,
>>
>> Thank you for your input.
>>
>> The SD is also in the director machine, indeed. I don't think it's a
>> routing issue - the iperf test was done between these two machines with
>> excellent results.
>>
>> I'm using disk storage; btape doesn't seem to be of help:
>> btape: btape.c:302 btape only works with tape storage.
>>
>> I am aware that a dd test vs many small files isn't comparable - but at
>> least it rules out the SD storage. (and see below)
>>
>> My interest is in knowing if there are known ways people use to speed up
>> the backup process when done over the internet. This is my first bacula
>> configuration backing up FDs in remote countries.
>>
>>
>> Consider the following:
>> # zfs create storage/test
>> # zfs set mountpoint=/test storage/test
>> # zfs set compression=off storage/test
>>
>>
>> # dd if=/dev/urandom of=/test/testfile bs=128k count=4096
>> 4096+0 records in
>> 4096+0 records out
>> 536870912 bytes transferred in 7.020243 secs (76474691 bytes/sec)
>>
>>
>>
>> Now at the director, I create a FileSet backing up this one file.
>> To aid bacula even more, I'll first put it in the OS cache:
>>
>> # dd if=/test/testfile of=/dev/null bs=128k
>> 4222+0 records in
>> 4222+0 records out
>> 553385984 bytes transferred in 2.910288 secs (190148180 bytes/sec)
>>
>> And finally, the backup job, using this FileSet:
>> FileSet {
>> Name = "TestFileSet"
>> Include {
>> Options {
>> #Compression=gzip
>> Signature=SHA1
>> Onefs=yes
>> Honor nodump flag=yes
>> Noatime=yes
>> }
>>
>> File = /test/testfile
>> }
>> }
>>
>>
>> Notice the read bytes/sec on the second dd.
>>
>> At this point, consider that:
>>
>> * An iperf test used the link at ~93%.
>> * The SD hdd is capable of writing at least 70MB/s.
>> * The FD hdd (ok, zfs cache) is capable of reading at least 180MB/s.
>>
>> It follows, I believe, that this test should show transfer rates close
>> to 100mbits. This is one big file, and the hdd is perfectly capable of
>> sustaining 12.5MB/s sequential read (far more, as demonstrated)
>>
>> However..
>>
>> Traffic Peak Total
>> em0 in 4.863MB/s 4.863MB/s 16.461GB
>> out 137.977KB/s 137.977 KB/s 495.591MB
>>
>> To the three points made above, consider that:
>>
>> * Bacula is using the network link at ~38.4% during this test.
>>
>>
>>
>> I had to disable the Maximum Network Buffer Size in the mean time,
>> coincidence or not the director started throwing out "unknown errors"
>> while connecting to storage, so this test is run with default buffer
>> sizes (which shouldn't be a problem - I got 91-93% of the max link
>> speed with iperf using default buffer sizes)
>>
>> This test:
>> * Uses TLS encryption [encrypted comms]
>> * Uses PKI encryption [encrypted backup data]
>> * Does not use compression
>>
>> I don't think TLS/PKI is the cause - there's plenty of CPU% while it's
>> running. Could investigate this further.
>>
>
> On how many cores? AFAIK the FD only uses one thread for TLS / PKI /
> compression.
> (At least it never goes over 100% CPU for me, even when running
> concurrent jobs)
>
>
>> Not sure what to try next. Any suggestions?
>>
>> Thanks for reading.
>>
>> Hugo
>>
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>
>
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
11 root 171 ki31 0K 128K CPU7 7 5127.9 100.00% {idle: cpu7}
11 root 171 ki31 0K 128K CPU5 5 5126.0 100.00% {idle: cpu5}
11 root 171 ki31 0K 128K CPU3 3 5122.7 100.00% {idle: cpu3}
11 root 171 ki31 0K 128K CPU4 4 5114.2 100.00% {idle: cpu4}
11 root 171 ki31 0K 128K CPU1 1 5113.7 100.00% {idle: cpu1}
11 root 171 ki31 0K 128K RUN 0 5101.2 100.00% {idle: cpu0}
11 root 171 ki31 0K 128K CPU2 2 5101.5 98.39% {idle: cpu2}
11 root 171 ki31 0K 128K CPU6 6 5123.7 90.58% {idle: cpu6}
61122 root 58 0 27848K 5900K select 7 0:05 9.28% {bacula-fd}
FreeBSD will move bacula-fd to another CPU now and then, but as you see
it's using only about 10% CPU during this test. Core #7, where it was at
the time of this snapshot, was 100% idle (this is actually a top
discrepancy - the process was on CPU#6 before, and you can see that one
is 90.58% idle, which sounds about right)
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