On 4/13/07, Brian J. Murrell <[EMAIL PROTECTED]> 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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