HP-UX HB v13.00 Ch-14 - JFS

HP-UX Handbook – Rev 13.00 Page 9 (of 47)
Chapter 14 Journaled File System (JFS)
October 29, 2013
o VxFS supports files larger than two terabytes and large file systems up to 256
terabytes.
• Online backup
o VxFS provides online data backup using the snapshot feature.
• Quotas
o VxFS supports quotas, which allocate per-user and per-group quotas and limit the
use of two principal resources: files and data blocks.
• Cluster File System
o Clustered file systems are an extension of VxFS that support concurrent direct
media access from multiple systems.
• Improved database performance
• Storage Checkpoints
o Backup and restore applications can leverage Storage Checkpoint, a disk- and
I/O-efficient copying technology for creating periodic frozen images of a file
system.
• Cross-platform data sharing
o Cross-platform data sharing allows data to be serially shared among
heterogeneous systems where each system has direct access to the physical
devices that hold the data.
• File Change Log
o The VxFS File Change Log tracks changes to files and directories in a file system.
• Multi-volume support
o The multi-volume support feature allows several volumes to be represented by a
single logical object.
• Dynamic Storage Tiering
o The Dynamic Storage Tiering (DST) option allows you to configure policies that
automatically relocate files from one volume to another, or relocate files by
running file relocation commands, which can improve performance for
applications that access specific types of files.
Note: VxFS supports all HFS file system features and facilities except for the linking,
removing, or renaming of “.” and “..” directory entries. Such operations may disrupt file
system sanity.
Upgrading VxFS