Rainer Duffner wrote:
Am 28.01.2008 um 02:36 schrieb Terry:
Good questions:
1) Do you have concurrent writes to the same file from different nodes?
1a) No
Well, that's one of the things GFS is good at ;-)
2) How many nodes do you have?
2a) 3 to start, probably won't go beyond 12
OK, that's still in the range GFS can handle (AFAIK).
With an order of magnitude room for growth left.
I appreciate alternative ideas to NFS. NFS could possibly introduce
performance issues (comments here appreciated).
One problem might be that NFS was never supposed to run on GBit-networks.
Thus there is overhead.
But, OTOH, the vendors I mentioned have managed to squeeze a lot of
performance out of NFS.
It's also a question of optimizing/matching NFS clients and servers.
I've found that NFS v3 over UDP with large rsize,wsize and jumbo frames
works pretty well.
The majority of the
system is write. I would say 80%.
Do you have a lot of small files?
Small files are usually what degrades GFS-performance.
I don't think small files are what kills it, it's lots of files that
slow things down.
Gordan
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