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Re: [Bacula-devel] MaximumBlockSize Problem and Question


On Wed, Nov 05, 2008 at 11:12:01AM +0100, Ulrich Leodolter wrote:
> Hello,
> 
> Problem:
> 
> Settings like (documented in the Manual)
> 
>      Minimum block size = 64K
>      Maximum block size = 200K
> 
> do not work. Both are defined as size_pint32.
> multipliers like K M are not allowed.
> don't know if this is intended, 
> maybe documentation just a little outdated.
> 
> 
> Question:
> 
> Can i expect performance improvements (especially for
> Copy/Migrate Disk to Tape jobs) by by increasing
> "Maximum block size" on File devices in bacula-sd.conf ???
> 
> Device {
>   Name = FileStorage
>   Media Type = File
>   Archive Device = /disk0/bacula/files
>   LabelMedia = yes;  
>   Random Access = Yes;
>   Requires Mount = No;
>   AutomaticMount = yes;
>   RemovableMedia = no;
>   AlwaysOpen = no;
>   MaximumBlockSize = 1048576;         # 1M
> }
> 

I think it should make difference at least with tape drives.. 

You can measure the difference with dd:

dd if=/dev/null of=/dev/tape bs=<try_different_block_sizes_here>

4k, 64k, 256k, 1MB, 4MB etc.

-- Pasi

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