Re: Max obtainable performance for a single OST - THANKS!

On 4/14/07, Andreas Dilger adilger-KYPl3Ael/zSakBO8gow8eQ@xxxxxxxxxxxxxxxx,  

                  Nathaniel Rutman nathan-KYPl3Ael/zSakBO8gow8eQ@xxxxxxxxxxxxxxxx wrote:

 

      > Use "lfs setstripe 0 0 3" for directory for ost[0,1,2], "lfs setstripe 0 3 3"
      > for directory for ost[3,4,5], etc.

  

      > You can use 'lfs setstripe' to designate a starting OST index, for a
      > file or a directory.  With that, you could set up different single-OSS
      > directories.

 

Thanks, this helps! In this way any file will indeed be confined to exactly one OSS

while will be able to make use the combined power of three internal OSTs.

 

      > If you have more than a single client reading from an OSS at the same
      > time, you don't even need to do that -- use three OSTs per OSS, with
      > everything single-striped.  Your multiple clients can use the different
      > OSTs simultaneously, increasing your total performance.
 

True, but in this way the peak performance per file will be that of only one OST,

which is only 300+ MB/sec in our case. Whereas with 3 OSTs striped we may

be able to obtain between 750 and 900+ MB/sec per file.

Thanks again for clarifying this issue - Andrei.

 

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