Installation guide

One ambiguity of directory truncation is that the truncation is done when
files are created and not when they are deleted. This is done because of the
efficiency of underlying algorithms, and is the same model used by UFS for
directory truncation. For example, after most files in a given directory are
deleted, the size of the directory file itself will not decrease until a new file
is inserted into that directory.
G.11.1.3 ULTRIX Migration Issues
The AdvFS file system does not exist on ULTRIX systems, so there are no
migration issues.
G.11.2 File System Access Control Lists
Access Control Lists (ACLs) on files and directories are a new feature in this
release. They are manipulated with the getacl and setacl commands.
See the Security manual and the reference pages for more information.
G.11.2.1 ULTRIX Migration Issues
The ULTRIX operating system does not support ACLs or property lists
(ACLs are implemented as a specific type of property list), so there are no
ULTRIX migration issues.
G.11.3 Logical Storage Manager
DIGITAL UNIX now provides the following new features for the Logical
Storage Manager (LSM):
• Two new LSM commands, volsave and volrestore, provide an easy
way to back up and restore the LSM configuration database. See the
reference pages for these commands.
• The Basic Operations menu in LSM’s graphical interface, dxlsm, now
provides support for disk operations. For example, how to add a disk to
LSM.
• The LSM limits have increased as follows:
– The maximum number of LSM volumes on a system has increased
from 256 to 4093.
– The maximum number of plexes on a system has increased from
256 to 4096.
– The maximum number of subdisks in a plex has increased from 256
to 4096.
G–20 Migration from ULTRIX Version 4.5 to DIGITAL UNIX Version 4.0B