Re: Max obtainable performance for a single OST

On 4/13/07, Brian J. Murrell <brian-KYPl3Ael/zSakBO8gow8eQ@xxxxxxxxxxxxxxxx> wrote:

On Fri, 2007-13-04 at 17:30 +0200, Andrei Maslennikov wrote:
> Time ago we have however considered and discarded this solution as we
> wanted to ensure that every file is confined to one and only one OSS capable
> to deliver 0.9-1 GB/sec.

Do you really mean OSS here or OST?  Given the 3 OSTs you would put on
the 3 RAID cards you have in your OSS, this would meet your requirements
wouldn't it?

 Hi Brian,

 I meant OSS here. If our configuration would include only one OSS with 3 OSTs
 and the default stripe count for the file system would be 3, the solution mentioned
 by Andreas would be ok (and we have even considered it before asking the first
 question on this list). The point is, if we would be adding other 3-OST-based OSS 
 machines to the same file system, it may so happen that the files may end up
 on different OSS machines (with a default stripe count of 3 one file may be split 
 over 3 OSTs in three different OSS hosts). 

 Our  main requirement  is to  ensure that  every file ends up  in one and only 
 one OSS box. If this is not possible with the multi-OST OSS machines, we
 may only be able to use one OST  per OSS, and hence  will have to  stay with  
 max 750  MB/sec  single file performance per OSS.

 Best regards - Andrei. 


 
 





 



   






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