HP Tru64 UNIX and TruCluster Server Version 5.1B-5 Patch Summary and Release Notes (March 2009)

3.2.1.28 New Attributes Added to NFS and RPC Subsystems
Several new tunable attributes have been added to the NFS server subsystem,
nfs_server, the NFS client subsystem, nfs, and the Remote Procedure Call (RPC)
subsystem, rpc Previously, the configurations produced by these attributes could only
be changed by using the dbx command. Now, you can easily use and modify these
kernel subsystem configurations with the sysconfig command.
The following list provides a brief description of these new attributes. For more
information about setting the attributes, see the new sys_attrs_nfs(5) reference page
delivered in this kit.
• nfs_server:
— nfs_write_gather and nfs3_write_gather
Improves NFS V2 and V3 performance by gathering several write requests,
performing a single sync, and sending all of the replies.
— nfs_ufs_lbolt and nfs3_ufs_lbolt
Enables or disables a delay when NFS V2 and NFS V3 returns writes. This
attribute affects write gathering for all file systems (not just UFS) for NFS V2
and V3.
• nfs:
— nfs_cto
Enables or disables Close-To-Open (CTO) consistency to reduce the number
of client caches that provide applications with stale NFS data.
— nfs_quicker_attr
Enables or disables synchronous cache flush.
— nfs3_broken_lookup
Controls the frequency of console messages related to an NFS V3 problem on
some servers where a file lookup would return erroneous data for the parent
directory.
— do_client_readdirplus
Enables or disables the operating system from issuing the readdirplus
procedure.
— nfs3_maxreadahead
Controls the number of outstanding read-aheads.
— nfs3_readaheads
Controls the number of read-aheads for NFS V3.
• rpc:
3.2 Prior Release Notes 55