HP Tru64 UNIX and TruCluster Server Version 5.1B-6 Patch Summary and Release Notes

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:
— use_fastsend
Enables or disables the optimization of client and server code used by NFS over UDP.
— use_fastroute
Enables or disables improved fastsend optimization that affect the NFS server.
New cam Attribute Controls Path Usage
A new attribute, cam_ccfg_aa_enable, has been added to the cam subsystem to control
preferred path usage.
When enabled, this attribute utilizes the target port group information from the storage controller
to determine the optimal paths and use these optimal paths for I/O access. When disabled, all
paths to that device are used.
Active-active asymmetric storage controllers may incur a performance penalty when accessed
on non-optimal paths.
For more information, including setting this attribute, see the revised sys_attrs_cam(5) reference
page delivered in this kit.
Prior Release Notes 41