HP Tru64 UNIX and TruCluster Server Version 5.1.B-4 Patch Summary and Release Notes (13156)

By default, booting will wait for all hwc registrations to be completed. However, you can force
the boot process to complete to the login prompt earlier by changing boot_wait_hwc_regs
to 0. In either case hwc_registration_complete can be queried. This will be set to 1 as soon
as registration is complete. In addition, you can also choose to receive a console message, an
EVM event, or both when all paths have registered.
To get the biggest speed improvement when booting, you can elect to finish booting without
waiting for path registration, which is not needed to access the storage subsystem (for example,
an Oracle® database). However, if you do this, you temporarily have an incomplete hierarchy
view from the commonly run hwmgr command.
Each of the following actions can help you determine when to run the hwmgr command in order
to see the complete hierarchy:
• Enable the EVM notification option, log in, and start evmwatch to look for the EVM event,
although the EVM event could have already occurred by the time you log in.
• Enable the console log message notification option and look in the messages file for the
message.
• Query sysconfig to ensure the I/O hwc_registration_complete attribute is set before
proceeding. This action can be used regardless of how you set the notification option.
1.28 New Attributes Added to NFS and RPC Subsystems
Several new tunable attributes have been added to the 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.
1.28 New Attributes Added to NFS and RPC Subsystems 27