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Hi,
ONTAP is 8.2 7-Mode, Jumboframes are enabled on vmk,vSwitch,Juniper,netapp. Flowcrontrol is disabled.
sysstat result:
CPU NFS CIFS HTTP Total Net kB/s Disk kB/s Tape kB/s Cache Cache CP CP Disk OTHER FCP iSCSI FCP kB/s iSCSI kB/s
in out read write read write age hit time ty util in out in out
7% 327 0 0 327 21105 170 1546 46706 0 0 10s 99% 36% H 20% 0 0 0 0 0 0 0
26% 1812 0 0 1819 118894 979 3904 149920 0 0 10s 97% 42% Hs 34% 7 0 0 0 0 0 0
30% 2169 0 0 2173 142749 1152 4777 151289 0 0 10s 98% 43% H 39% 4 0 0 0 0 0 0
7% 339 0 0 341 21437 173 1974 46820 0 0 10s 98% 41% H 19% 2 0 0 0 0 0 0
6% 413 0 0 418 26667 255 2736 11036 0 0 10s 99% 16% Hf 7% 5 0 0 0 0 0 0
5% 339 0 0 341 21778 175 150 35670 0 0 10s 99% 58% : 13% 2 0 0 0 0 0 0
8% 434 0 0 578 27055 263 2080 43976 0 0 10s 98% 58% Hf 13% 144 0 0 0 0 0 0
4% 386 0 0 391 24954 217 42 5880 0 0 10s 99% 18% : 11% 5 0 0 0 0 0 0
7% 435 0 0 438 28070 233 2896 47290 0 0 10s 99% 69% H 21% 3 0 0 0 0 0 0
Windowsize is set to options nfs.tcp.recvwindowsize 65535.
I have no clue why snapshot is slow while dd or migration is fast.