[ADSM-L] Antwort: Re: [ADSM-L] stgp volumes

Hi Grant,


thankyou for responding; I got a similar answer from IBM level 2, saying
there is really no way to control how stgp volumes are used by tsm.

regards,
Dierk



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  |Grant Street <grants AT AL.COM DOT AU>                                       
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  |ADSM-L AT VM.MARIST DOT EDU,                                                 
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  |30.08.2013 09:28                                                             
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  |Re: [ADSM-L] stgp volumes                                                    
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  |"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>                      
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This is my observation for File based stg pools so YMMV
For File based storage pools, TSM seems to create the files in a round
robin fashion for each storage directory.

Anything past the initial client sessions, TSM is ignorant of the
storage. It does not care where the data comes from, other process using
the same location or files.

For single processes it doesn't matter but all bets are off for multi
threads or proceses. So it is best to plan for worst case scenario eg
all threads/proc/sessions hitting the same location.

So it's better to have a single location/directory/lun that is twice as
fast, rather two locations.

Grant
On 30/08/13 15:47, Dierk Harbort wrote:
> Hello all!
>
>
> Lets say, a tsm server has 1 storagepool, type disk. This stgp has 5
> volumes. 3 of those reside on SAN1, and the 2 others on SAN2. Up to 65%
> utilisation on the pool every day. Migration to tape runs properly, so
all
> 5 volumes are empty.
> Now I would like to understand, how tsm server decides usage of a stgp
> volumes. Is it "round robin", or what ever.
>
> Does anybody know the answer, or a place to read about?
>
> TIA
> Dierk
>
>
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