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

New Attribute Controls Tape Driver Path Control
A new cam tape subsystem attribute, enable_preferred_path, lets you control preferred
path behavior for a tape driver. Enabling this attribute (1) causes the tape driver to assign different
paths to different tape drives. The default (0) disables preferred path behavior. The revised
sys_attrs_cam(5) reference page delivered in this kit describes the enable_preferred_path
attribute.
A problem may exist when using preferred path behavior when you use a no-rewind tape device.
If the application is not expecting the tape to change position between a previous tape close and
a subsequent tape open, the data already on the tape may be lost with the next write command,
possibly resulting in unusable backups. This problem only occurs when a system has multiple
initiators.
The following steps will prevent this problem from occurring:
• Before performing a backup, reserve the device and lock down the path as follows:
# mt -f /dev/ntape/tape0 reserve
• After performing the backup, release the device and unlock the path as follows:
# mt -f /dev/ntape/tape0 release
pr Command Behavior Now Works as Described in Reference Page
The pr command has been modified to handle the i [character] [gap] option (which
replaces multiple space characters with tab characters) so that it performs as documented in the
pr(1) reference page.
Kit's Session Log Made More Useful
If you view the session log for this release, you may notice that it is smaller than it has been in
the past. We edited this file to remove non-essential information that the system generates
automatically.
Sys_Check Version 143 Provided
This kit includes Sys_Check Version 143. However, HP recommends that you visit the sys_check
website to download and install the version there if it is more recent than Version 143:
http://h30097.www3.hp.com/sys_check/
New Variables Protect Against Attack
This kit provides two new kernel tunable variables, tcp_rst_win and tcp_syn_win to protect
systems against potential vulnerabilities called TCP RST attack and TCP SYN attack. For more
information, see “Potential Security Vulnerability Identified” and a revised sys_attrs_inet(8)
reference page, which is installed with this kit.
New fuser Option Aids Query Search
A new option, -a, has been added to the fuser command to expand a query to search of all
cluster members. See the fuser(8) reference page for more information.
New /etc/printcap Option Provided
This kit provides a new boolean /etc/printcap option, sr, to suppress the reprinting of jobs
under conditions that indicate to the print daemon that a reprint is needed. The syntax for this
entry is similar to that of the sh (suppress header) option.
You can use this option to suppress an unexpected or unneeded reprinting of jobs that are
completed but are reprinted a second time due to miscommunication between the printer and
the print daemon.
Be aware that if you set this option, incomplete jobs that trigger reprint conditions will not reprint.
Prior Release Notes 43