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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