This command displays statistical information about NFS and RPC connections. Use the following syntax to display NFS server and client statistics:
# nfsstat [ –cmnrsz ]
Displays client-side information
Displays statistics for each NFS-mounted file system
Displays the NFS information on both the client side and the server side
Displays RPC statistics
Displays the server-side information
Specifies that the statistics should be set to zero
If no options are supplied, the –cnrs options are used.
Gathering server-side statistics can be important for debugging problems when new software or new hardware is added to the computing environment. Running this command a minimum of once a week, and storing the numbers, provides a good history of previous performance.
Example 6-1 Displaying NFS Server Statistics# nfsstat -s Server rpc: Connection oriented: calls badcalls nullrecv badlen xdrcall dupchecks dupreqs 719949194 0 0 0 0 58478624 33 Connectionless: calls badcalls nullrecv badlen xdrcall dupchecks dupreqs 73753609 0 0 0 0 987278 7254 Server NFSv2: calls badcalls referrals referlinks 25733 0 0 0 Server NFSv3: calls badcalls referrals referlinks 132880073 0 0 0 Server NFSv4: calls badcalls referrals referlinks 488884996 4 0 0 Version 2: (746607 calls) null getattr setattr root lookup readlink read 883 0% 60 0% 45 0% 0 0% 177446 23% 1489 0% 537366 71% wrcache write create remove rename link symlink 0 0% 1105 0% 47 0% 59 0% 28 0% 10 0% 9 0% mkdir rmdir readdir statfs 26 0% 0 0% 27926 3% 108 0% Version 3: (728863853 calls) null getattr setattr lookup access 1365467 0% 496667075 68% 8864191 1% 66510206 9% 19131659 2% readlink read write create mkdir 414705 0% 80123469 10% 18740690 2% 4135195 0% 327059 0% symlink mknod remove rmdir rename 101415 0% 9605 0% 6533288 0% 111810 0% 366267 0% link readdir readdirplus fsstat fsinfo 2572965 0% 519346 0% 2726631 0% 13320640 1% 60161 0% pathconf commit 13181 0% 6248828 0% Version 4: (54871870 calls) null compound 266963 0% 54604907 99% Version 4: (167573814 operations) reserved access close commit 0 0% 2663957 1% 2692328 1% 1166001 0% create delegpurge delegreturn getattr 167423 0% 0 0% 1802019 1% 26405254 15% getfh link lock lockt 11534581 6% 113212 0% 207723 0% 265 0% locku lookup lookupp nverify 230430 0% 11059722 6% 423514 0% 21386866 12% open openattr open_confirm open_downgrade 2835459 1% 4138 0% 18959 0% 3106 0% putfh putpubfh putrootfh read 52606920 31% 0 0% 35776 0% 4325432 2% readdir readlink remove rename 606651 0% 38043 0% 560797 0% 248990 0% renew restorefh savefh secinfo 2330092 1% 8711358 5% 11639329 6% 19384 0% setattr setclientid setclientid_confirm verify 453126 0% 16349 0% 16356 0% 2484 0% write release_lockowner illegal 3247770 1% 0 0% 0 0% Server nfs_acl: Version 2: (694979 calls) null getacl setacl getattr access getxattrdir 0 0% 42358 6% 0 0% 584553 84% 68068 9% 0 0% Version 3: (2465011 calls) null getacl setacl getxattrdir 0 0% 1293312 52% 1131 0% 1170568 47%
The example shows how to display the statistics for RPC and NFS activities. In both sets of statistics, knowing the average number of badcalls or calls and the number of calls per week can help identify a problem. The badcalls value reports the number of bad messages from a client. This value can indicate network hardware problems.
Some of the connections generate write activity on the disks. A sudden increase in these statistics could indicate trouble and should be investigated. For NFS Version 2 statistics, the connections to note are setattr, write, create, remove, rename, link, symlink, mkdir, and rmdir. For NFS Version 3 and NFS Version 4 statistics, the value to watch is commit. If the commit level is high in one NFS server compared to another almost identical server, check that the NFS clients have enough memory. The number of commit operations on the server grows when clients do not have available resources.