Hi Andreas,
Hi Josh,
Thanks for your hints toward NTFS performance. I have checked the access time
setting on the windows file server and on all it was disabled. The Windows
Server 2008 R2 are configured with the Fileserver role, I think Windows set the
value automatically.
During my research from the NTFS side I stumble over VSS again and I observed
that even I configured the Maximum Concurrent Jobs on the Windows FD Client to
10 only one job backups real data, the others just wait before the VSS line in
the log file. After the first job finished, one of the other print the VSS line
and backup real data. It seems that only one VSS shadow copy can be use by the
bacula-fd.exe.
I couldn’t found anything in the documentation [1] and only this on the
mailinglist, without a concrete answer [2].
Can I configure the bacula-fd.exe two use more than one VSS shadow copy at the
same time?
I talked to our windows expert and he told me that Windows Server 2008 R2 can
have up to 64 concurrent VSS shadow copy.
Thanks again,
Patrick
[1]
http://www.bacula.org/5.2.x-manuals/en/main/main/Windows_Version_Bacula.html#SECTION003480000000000000000
[2] http://adsm.org/PRIVOXY-FORCE/lists/html/Bacula-users/2012-09/msg00151.html
> On 01 Dec 2014, at 18:06, lst_hoe02 AT kwsoft DOT de wrote:
>
>
> Zitat von Josh Fisher <jfisher AT pvct DOT com>:
>
>> On 11/29/2014 5:43 AM, Patrick wrote:
>>
>>> Hi Josh, Thanks for your reply.
>>>> You can try to isolate the problem. Try running a Windows backup with
>>>> VSS, compression, and encryption all turned off. Compare a Windows VM
>>>> against a Linux VM on the same host if possible.
>>>
>>> I don’t use compression or encryption, but VSS. I disabled VSS and get
>>> about 40 MByte/s. If I also set acl support = no, I get about 43
>>> MByte/s. It’s better, but far away from the 90 MByte/s from a linux box
>>> with similar data. Last night I have took a look at the bacula console
>>> during the full backups and could see one Windows clients with 65
>>> MByte/s. This server hosts a SQL Server with big database dump files.
>>> The Bacula File Daemon is faster with big files. How can I tune the
>>> Bacula File Daemon to increase the transfer rate for a lot of small
>>> files? Can I set the maximum memory usage? Is a ramdisk which collects
>>> the files from the hard drive and send it as bunches to bacula possible?
>>
>> You can change the MaximumNetworkBufferSize to 32k in both the client
>> and SD configurations. Slowdowns of Windows clients have been noted
>> before for 64k+ buffer sizes.
>>
>> You might also consider tweaking the NTFS filesystem on the Windows
>> client. The filesystem parameters are in
>> HKLM/system/CurrentControlSet/Control/FileSystem. Setting the DWORD
>> value NtfsDisableLastAccessUpdate to nonzero will prevent a write to
>> the disk each time a file is accessed. It is equivalent to the noatime
>> option of ext4, so can definitely impact jobs like bacula-fd that are
>> reading lots of files.
>>
>
> Technical details in case of NTFS can be found here for example:
> http://technet.microsoft.com/de-de/library/bb457112%28en-us%29.aspx
>
> Regards
>
> Andreas
>
>
>
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