HP-UX 11i Version 1.6 Release Notes

Other Functionality
Default File System Parameters
Chapter 8
156
Impact
These changes only affect the values as they apply to the standard file systems (/, /usr,
/var, /opt, /tmp, /home, /stand) as created by Ignite-UX through an installation from
media (known as a Cold Install) or through Instant Ignition. A user adding a new or
additional file system either through Ignite-UX, or later with mkfs, is free to choose their
own values, and finds the default values for new or additional file systems unchanged
from previous Ignite-UX releases.
The change to the default
blocksize parameter could have a significant effect on disk
utilization for some users, especially for those using large numbers of small files. For
example, consider an application, built on VxFS, that currently uses 10,000 semaphore
files under /tmp. Using 1Kb files, the semaphores would consume 10MB of disk space.
However, by using the new default size, the semaphore files now consume 80MB. You
should be aware of this possibility and plan accordingly.
NOTE You can change file system parameter values using the Ignite-UX Advanced
Installation option. Please refer to the Ignite-UX Administration Guide for more
information on using the Advanced Installation functionality to change file system
parameters.
Compatibility
There are no compatibility issues.
Performance
These changes are designed to improve overall file system performance for the majority
of users. Depending on your current configurations, you may experience varying
amounts of improvement.
Obsolescence
Not applicable.
Documentation
For more information on these changes, including how to use Ignite-UX to maintain
earlier file system settings for these parameters, refer to the Ignite-UX Release Notes for
B.3.7, which can be found in /opt/ignite/doc/release_note and at:
http://software.hp.com/products/IUX.