Re: [Veritas-bu] Tuning backups.

Was there any resolution here?  Anyone test this by adding to the boot
param line?

Adding something like:  st=buffer_kbs:256,max_buffers:6

Anyone? Beuhler?

-Andrew

Justin Piszcz wrote:
> 
> On Wed, 5 Sep 2007, Justin Piszcz wrote:
> 
>>
>> On Wed, 5 Sep 2007, Parker, Matthew wrote:
>>
>>> What type of benchmark testing are you looking for?
>>>
>>> -----Original Message-----
>>> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
>>> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of 
>>> Justin Piszcz
>>> Sent: Wednesday, September 05, 2007 4:36 AM
>>> To: veritas-bu AT mailman.eng.auburn DOT edu
>>> Subject: [Veritas-bu] Tuning backups.
>>>
>>> There are several ways to tune backups.
>>>
>>> 1. NET_BUFFER_SZ
>>> 2. SIZE_DATA_BUFFERS
>>> 3. NUM_DATA_BUFFERS
>>>
>>> While these help a little, I found by reading the NBU6 optimization 
>>> document I improved speed by 2x in some cases (need to do some more
>>> verification) using 256k buffers in the kernel (Linux) st driver rather 
>>> than the default of 32k and also using more of them.
>>>
>>> Anyone here do a LOT of benchmark testing?
>> So far, it would appear that using general optimizations in NetBackup
>> only help so much, such as the ones mentioned above with the exception
>> of NET_BUFFER_SZ, I still need to look into that one.
>>
>> The buffers in the kernel appear to help much more, in Linux 2.4 the
>> default buffers for the st tape driver are 32k and there's four of them.
>>
>> I want to know every possible tunable parameter and its effect on the
>> system for the fastest backup possible.
>>
>> Justin.
>>
>> _______________________________________________
>> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
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>>
> 
> In particular:
> 
> 9.3.1. st boot parameters
> 
> st=xxx[,yyy] where xxx is one of the following:
> buffer_kbs:<n>
> write_threshold_kbs:<n>
> max_buffers:<n>
> max_sg_segs:<n>
> 
> (The old boot parameters st=aa[,bb[,cc[,dd]]] supported but deprecated)
> 
> 
> http://www.linux.com/base/ldp/howto/SCSI-2.4-HOWTO/st.html
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> 
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