ONCplus B.11.31.09 Release Notes HP-UX 11i v3

3 Features Introduced in previous versions of ONCplus
This chapter describes about the features introduced and/or defect fixes in all the previous
versions of ONCplus B.11.31.
• “Features Introduced in ONCplus B.11.31.08” (page 19)
• “Features Introduced in ONCplus B.11.31.07.01” (page 20)
• “Features Introduced in ONCplus B.11.31.07” (page 20)
• “Features Introduced in ONCplus B.11.31.06” (page 20)
• “Features Introduced in ONCplus B.11.31.05” (page 20)
• “Features Introduced in ONCplus B.11.31.04” (page 20)
• “Features Introduced in ONCplus B.11.31.03” (page 21)
• “Features Introduced in ONCplus B.11.31.02” (page 22)
• “Features Introduced in ONCplus B.11.31.01” (page 23)
• “Features Introduced in ONCplus B.11.31_LR ” (page 23)
• “Software Availability in Native Languages” (page 27)
Features Introduced in ONCplus B.11.31.08
ONCplus B.11.31.08 includes both defect fixes and new features. All features introduced in
previous ONCplus versions are supported in ONCplus B.11.31.08. The following features were
introduced in ONCplus B.11.31.08:
New NFS Features in ONCplus B.11.31.08
NFS introduces the following features:
• The NFS mount structure nfs_args is made public.
The NFS structure nfs_args is made public and available for user application development
under /usr/include/nfs/mount.h header file. The user applications can make use of
this structure to mount NFS shares using mount()system call. For more information on the
usage of the structure, see the mount_nfs(1m) manpage.
• Asynchronous NFS Direct I/O performance improvement.
NFS Direct I/O: NFS Direct I/O is I/O to the NFS mounted files which avoids the file system
buffer cache of the operating system. It saves memory and improves performance of the
database applications that cache their own data independently. It can be enabled for an NFS
mount point, using the forcedirectio NFS mount option.
This use of forcedirectio option results in synchronous NFS I/O requests to the NFS
server. The synchronous I/O operation resulted in a low network utilization on fast networks
(10 GB Ethernet). Due to this drawback, a new Asynchronous NFS Direct I/O feature is
introduced. This option allows the NFS client to send multiple I/O requests to the server
without a synchronous wait for individual request. This helps in improving the performance
of the database with large sequential I/O.
This feature can be enabled using the following three tunables.
— nfs3_enable_async_directio_read
— nfs3_enable_async_directio_write
— nfs3_max_async_directio_requests
For more information on these tunables, see the Managing NFS and KRPC Kernel Configurations
in HP-UX 11i v3 whitepaper at http://www.docs.hp.com/ >> I/O Cards and Networking
Software >> NFS Services >> White Papers.
Features Introduced in ONCplus B.11.31.08 19