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

2 Tru64 UNIX Patches
This chapter provides information about the defect fixes included in Version 5.1B-6 for the base
operating system.
This chapter is organized as follows:
• The “New Release Notes” section lists release notes that are specific to the Tru64 UNIX
patches in this kit, as well as release notes that are of general interest.
• The “Prior Release Notes” section lists release notes listed from the initial Version 5.1B
release through Version 5.1B-5.
• The “Changes to Reference Pages” section lists reference pages that have been updated or
added since the initial Version 5.1B release.
• The “Summary of Base Operating System Patches” section provides brief descriptions of
the changes delivered in this patch kit and in prior Version 5.1B patch kits.
New Release Notes
This release contains only defect fixes. There are no new features or enhancements added in this
release of Tru64 UNIX software.
Prior Release Notes
Because patch kits are cumulative, this kit will install all of the fixes, features, and changes that
have been added since you last installed a Version 5.1B patch kit. The following sections describe
the changes contained in this kit that were first introduced in prior kits.
Dynamic Pathing in Disk Driver
This kit enhances the CAM disk driver to dynamically recognize and use newly added paths
while the device is in use.
The new behavior will now dynamically recognize and use new paths while the device is in use,
thereby making all the paths available for I/O.
Before Version 5.1B-5, the disk driver used all paths that were available at open/mount time.
Paths added after would not be added to the active set until a close/open or dismount/mount
occurred.
Performance Improvement for TCP Applications
The TCP selective acknowledgment feature is enabled by default. When the selective
acknowledgments feature is enabled, the data receiver can inform the sender about all the
segments that were received successfully, so that the sender needs to retransmit only those
segments that were lost. This improves the performance of TCP applications on a network which
is experiencing packet loss.
Support for 2 TB LUNs
This kit enhances the Tru64 UNIX CAM (Call Applications Manager ) subsystem to support a
LUN size of upto 2 TB from the previous maximum limit of 1 TB. This allows Tru64 UNIX to
take advantage of the increased LUN size supported by the storage arrays.
Enhancements to binary.errlog
This kit enhances the error log feature to improve user experience. In some error situations, the
entries appear to be missing time sequences within the binary.errlog file, which makes it
difficult to determine if the system did not have any events to log or there was some issue (such
as low disk free space) that disabled event reporting for a period of time.
New Release Notes 23