HP-UX 11i March 2002 Release Notes

New and Changed Disk and File Management Features
New Version of Journaled File System (JFS)
Chapter 9
159
http://docs.hp.com and on the Instant Information CD, in both HTML and PDF
formats.
Compatibility Issues
JFS ACLs use a different format from HFS ACLs. However, the new command,
vxfsconvert (1M) will convert an HFS file system to a JFS file system, as well as HFS
ACLs to JFS ACLs (with the limitation that HFS ACLs with no JFS ACL equivalents
are not converted). See Managing Systems and Workgroups: A Guide for HP-UX System
Administrators, part no. B2355-90742, for a description of the procedure for converting a
file system.
Note that JFS ACLs require a file system with the new disk layout (version 4). To
upgrade a file system from an older disk layout to version 4, you can use the vxupgrade
command.
JFS 3.3 uses new header files. As far as the JFS module is concerned, a well-behaved
application will not need to be recompiled. However, a kernel-intrusive application will
need to be recompiled with the new header files, and possibly with some corresponding
code changes. You should check with the application provider before upgrading.
Performance Issues
JFS 3.3 generally outperforms previous releases, as design changes have reduced the
number of bottlenecks resulting from globally shared locks. JFS includes tunables and
features to support improved performance in the OLTP, DSS, and technical computing
markets. With appropriate tuning, JFS 3.3 also outperforms HFS in all categories.
JFS 3.3 includes a new command, vxtunefs, for tuning a VxFS file system. See vxtunefs
(1M) and tunefstab (4). Also see the HP JFS 3.3 and HP OnLineJFS 3.3 VERITAS File
System 3.3 System Administrator's Guide for information on tuning a JFS file system.
NOTE The volcopy and labelit commands will be obsoleted in a future release. You should
use vxdump and vxrestore for backup and restore, or you can use an application-specific
utility. You can use dd to make a literal copy of the file system.