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I have an issue about nfs performance. The server is connected via an ISCSI connection TO a SAN. I have sometimes and more and more often load picks and client freezes.

I added RAM and try to optimize via different stuff :

  1. sysctl -w vm.dirty_background_ratio=5
  2. sysctl -w vm.dirty_ratio=10
  3. increased to 256 the nfs number of process
  4. checked the filesystems

I'm already using those nfs options rw,async,no_subtree_check,insecure,insecure_locks I'm using nfsv4. I have 2 ports in bond mode 0 round robin 1G/s each the clients also got a 1G/s port

David Makogon
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nfsIsProblem
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  • vm.dirty_background_ratio is 5% if the RAM. On a host with lot ot memory this can be quite a big number. Try to use dirty_bytes and set it to the value which will be handled with you SAN infrastructure. – kofemann Jul 05 '16 at 06:12
  • I have 2 G RAM and a lot of swap but the swap is never really used. – nfsIsProblem Jul 05 '16 at 10:01

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