You can use the nfso command to configure NFS attributes.
It sets or displays NFS-related options associated with the currently running kernel and NFS kernel extension. See The nfso Command in AIX 5L Version 5.3 Commands Reference, Volume 4 for a detailed description of the command and its output.
Note: The nfso command performs no range-checking. If it is used incorrectly, the nfso command can make your system inoperable.
The nfso parameters and their values can be displayed by using the nfso -a command, as follows:
# nfso -a
portcheck = 0
udpchecksum = 1
nfs_socketsize = 60000
nfs_tcp_socketsize = 60000
nfs_setattr_error = 0
nfs_gather_threshold = 4096
nfs_repeat_messages = 0
nfs_udp_duplicate_cache_size = 5000
nfs_tcp_duplicate_cache_size = 5000
nfs_server_base_priority = 0
nfs_dynamic_retrans = 1
nfs_iopace_pages = 0
nfs_max_connections = 0
nfs_max_threads = 3891
nfs_use_reserved_ports = 0
nfs_device_specific_bufs = 1
nfs_server_clread = 1
nfs_rfc1323 = 1
nfs_max_write_size = 65536
nfs_max_read_size = 65536
nfs_allow_all_signals = 0
nfs_v2_pdts = 1
nfs_v3_pdts = 1
nfs_v2_vm_bufs = 1000
nfs_v3_vm_bufs = 1000
nfs_securenfs_authtimeout = 0
nfs_v3_server_readdirplus = 1
lockd_debug_level = 0
statd_debug_level = 0
statd_max_threads = 50
utf8_validation = 1
nfs_v4_pdts = 1
nfs_v4_vm_bufs = 1000
Most NFS attributes are run-time attributes that can be changed at any time. Load time attributes, such as nfs_socketsize, need NFS to be stopped first and restarted afterwards. The nfso -L command provides more detailed information about each of these attributes, including the current value, default value, and the restrictions regarding when the value changes actually take effect:
# nfso –L
NAME CUR DEF BOOT MIN MAX UNIT TYPE DEPENDENCIES
--------------------------------------------------------------------------------
portcheck 0 0 0 0 1 On/Off D
--------------------------------------------------------------------------------
udpchecksum 1 1 1 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_socketsize 600000 600000 600000 40000 1M Bytes D
--------------------------------------------------------------------------------
nfs_tcp_socketsize 600000 600000 600000 40000 1M Bytes D
--------------------------------------------------------------------------------
nfs_setattr_error 0 0 0 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_gather_threshold 4K 4K 4K 512 8193 Bytes D
--------------------------------------------------------------------------------
nfs_repeat_messages 0 0 0 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_udp_duplicate_cache_size
5000 5000 5000 5000 100000 Req I
--------------------------------------------------------------------------------
nfs_tcp_duplicate_cache_size
5000 5000 5000 5000 100000 Req I
--------------------------------------------------------------------------------
nfs_server_base_priority 0 0 0 31 125 Pri D
--------------------------------------------------------------------------------
nfs_dynamic_retrans 1 1 1 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_iopace_pages 0 0 0 0 65535 Pages D
--------------------------------------------------------------------------------
nfs_max_connections 0 0 0 0 10000 Number D
--------------------------------------------------------------------------------
nfs_max_threads 3891 3891 3891 5 3891 Threads D
--------------------------------------------------------------------------------
nfs_use_reserved_ports 0 0 0 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_device_specific_bufs 1 1 1 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_server_clread 1 1 1 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_rfc1323 1 0 0 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_max_write_size 64K 32K 32K 512 64K Bytes D
--------------------------------------------------------------------------------
nfs_max_read_size 64K 32K 32K 512 64K Bytes D
--------------------------------------------------------------------------------
nfs_allow_all_signals 0 0 0 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_v2_pdts 1 1 1 1 8 PDTs M
--------------------------------------------------------------------------------
nfs_v3_pdts 1 1 1 1 8 PDTs M
--------------------------------------------------------------------------------
nfs_v2_vm_bufs 1000 1000 1000 512 5000 Bufs I
--------------------------------------------------------------------------------
nfs_v3_vm_bufs 1000 1000 1000 512 5000 Bufs I
--------------------------------------------------------------------------------
nfs_securenfs_authtimeout 0 0 0 0 60 Seconds D
--------------------------------------------------------------------------------
nfs_v3_server_readdirplus 1 1 1 0 1 On/Off D
--------------------------------------------------------------------------------
lockd_debug_level 0 0 0 0 10 Level D
--------------------------------------------------------------------------------
statd_debug_level 0 0 0 0 10 Level D
--------------------------------------------------------------------------------
statd_max_threads 50 50 50 1 1000 Threads D
--------------------------------------------------------------------------------
utf8_validation 1 1 1 0 1 On/Off D
--------------------------------------------------------------------------------
nfs_v4_pdts 1 1 1 1 8 PDTs M
--------------------------------------------------------------------------------
nfs_v4_vm_bufs 1000 1000 1000 512 5000 Bufs I
--------------------------------------------------------------------------------
n/a means parameter not supported by the current platform or kernel
Parameter types:
S = Static: cannot be changed
D = Dynamic: can be freely changed
B = Bosboot: can only be changed using bosboot and reboot
R = Reboot: can only be changed during reboot
C = Connect: changes are only effective for future socket connections
M = Mount: changes are only effective for future mountings
I = Incremental: can only be incremented
Value conventions:
K = Kilo: 2^10 G = Giga: 2^30 P = Peta: 2^50
M = Mega: 2^20 T = Tera: 2^40 E = Exa: 2^60
To display or change a specific parameter, use the nfso -o command. For example:
# nfso -o portcheck
portcheck= 0
# nfso -o portcheck=1
The parameters can be reset to their default value by using the -d option. For example:
# nfso -d portcheck
# nfso -o portcheck
portcheck= 0
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