Ao assumir que você usa o cliente Linux, você pode usar o comando mountstats , que imprime estatísticas por ponto de montagem:
$ mountstats /mnt
Stats for xxxx:/ mounted on /mnt:
NFS mount options: rw,vers=4.1,rsize=32768,wsize=32768,namlen=255,acregmin=3,acregmax=60,acdirmin=30,acdirmax=60,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=a.b.c.d,local_lock=none
NFS server capabilities: caps=0x3ffdf,wtmult=512,dtsize=32768,bsize=0,namlen=255
NFSv4 capability flags: bm0=0xfcffbfff,bm1=0x40fdbe3e,bm2=0x800,acl=0x3,sessions,pnfs=LAYOUT_NFSV4_1_FILES
NFS security flavor: 1 pseudoflavor: 0
NFS byte counts:
applications read 602253119 bytes via read(2)
applications wrote 1750 bytes via write(2)
applications read 0 bytes via O_DIRECT read(2)
applications wrote 0 bytes via O_DIRECT write(2)
client read 552781120 bytes via NFS READ
client wrote 1750 bytes via NFS WRITE
RPC statistics:
634086 RPC requests sent, 634061 RPC replies received (0 XIDs not found)
average backlog queue length: 0
READ:
164908 ops (26%)
avg bytes sent per op: 208 avg bytes received per op: 3457
backlog wait: 0.112984 RTT: 0.523801 total execute time: 0.651181 (milliseconds)
GETATTR:
156471 ops (24%) 4 retrans (0%) 0 major timeouts
avg bytes sent per op: 191 avg bytes received per op: 267
backlog wait: 0.202849 RTT: 0.257179 total execute time: 0.496686 (milliseconds)
LAYOUTGET:
156323 ops (24%)
avg bytes sent per op: 236 avg bytes received per op: 215
backlog wait: 0.007536 RTT: 5.057336 total execute time: 5.319857 (milliseconds)
OPEN_NOATTR:
156321 ops (24%)
avg bytes sent per op: 260 avg bytes received per op: 347
backlog wait: 0.007126 RTT: 0.473941 total execute time: 0.489806 (milliseconds)
no sistema baseado em RedHat, é uma parte do pacote nfs-util. No debian provavelmente baseado no nfs-common.