[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Bacula-devel] MaximumBlockSize Problem and Question

Alex Chekholko schrieb:
> On Wed, 5 Nov 2008 16:12:51 +0100
> Kern Sibbald <kern@xxxxxxxxxxx> wrote:
> > For writing to tape (providing it is LTO-n) I strongly recommend a block size 
> > not to exceed 256K.
> > 
> Hi Kern,
> Why do you say that?  Is this thread relevant?: 
> http://www.mail-archive.com/bacula-devel@xxxxxxxxxxxxxxxxxxxxx/msg01246.html
> Also, I would like to corroborate the OP's experiences; I had an almost
> identical thread about small block size and slow write speed:
> http://www.nabble.com/LTO-4-performance--td17407840.html
> In fact, I was unable to get higher block sizes working at all with
> btape: 
> http://www.adsm.org/lists/html/Bacula-users/2008-05/msg00504.html
> So I am still stuck at ~22MB/s writing to LTO-4 with the default block
> size.

I don't think that the blocksize is the problem. I did some tests but
couldn't get higher results with larger blocksizes. I get 75-85 MB/s
with the default bs and no additional tuning.


This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
Bacula-devel mailing list

This mailing list archive is a service of Copilot Consulting.