HP-UX 11i September 2001 Release Notes

New and Changed Disk and File Management Features
New Version of Journaled File System (JFS) (new at 11i original release)
Chapter 9
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New Version of Journaled File System (JFS) (new at 11i
original release)
HP-UX 11i includes a new version of the Journaled File System (JFS), version 3.3 as
opposed to the previous version 3.1. (JFS is also known as the VERITAS File System or
VxFS).
New features in JFS 3.3 include:
• support for access control lists (ACLs), the only HFS feature unavailable in JFS 3.1
(see aclv (5), getacl (1), setacl (1), acl (2), and aclsort (3C)). JFS contains a superset of
HFS functionality. This enables all users to consider migration from HFS to JFS.
• a new disk layout, that is, version 4
• a new command for tuning a VxFS file system, vxtunefs (see vxtunefs (1M) and
tunefstab (4))
• a new command, vxfsconvert, for converting an HFS file system to a JFS file
system. This command also converts HFS ACLs to JFS ACLs, with some limitations
(see vxfsconvert (1M)).
• performance enhancements
• new packaging and licensing strategy for HP OnLineJFS 3.3 (see vxlicense (1M) and
vxenablef (1M))
• a better solution for the file system shrink limitation when using the version 4 disk
layout
With the HP-UX 11i release, JFS becomes a superset of the functionality available in
HFS now that JFS includes support for ACLs.
In HP-UX 11i, one kernel library contains the kernel functionality for both the JFS and
the OnLineJFS products. When you install the JFS product, all the software for
OnLineJFS is also installed, but its features are not enabled unless you also purchase
and install HP OnLineJFS.
Having all the kernel functionality for both products in one library resolves many of the
patching problems that existed in previous releases.
With the JFS version 4 disk layout in JFS 3.3, you are much less likely to encounter the
file system shrink limitation that existed in JFS versions in HP-UX 10.20 and 11.0. That
is, previously JFS could not shrink a file system if there were file extents residing in the
area being reduced. Now, JFS 3.3 with the version 4 disk layout, attempts to move
extents off the area of the file system being reduced. This provides a greater chance of
success when shrinking JFS file systems. However, there may still be some occasions
where JFS cannot move extents off the area of the file system being reduced, in which
case a shrink will still fail.
All VxFS manual pages are updated, and manual pages for generic HP-UX commands
and functions which accommodate ACLs (e.g., cp, find) are also updated. See Managing
Systems and Workgroups: A Guide for HP-UX System Administrators, part no.
B2355-90742 for a description of JFS ACLs and how to use them.
The HP JFS 3.3 and HP OnLineJFS 3.3 VERITAS File System 3.3 System
Administrator's Guide is available on HP’s documentation Web site at