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

HP-UX Handbook – Rev 13.00 Page 8 (of 47)
Chapter 14 Journaled File System (JFS)
October 29, 2013
 Version 7 extends support for multiple volumes to permit Dynamic Storage Tiering.
Dynamic Storage Tiering allows root users to move files among different volumes,
allocate files to different volumes at file creation time based on policy, and independently
recover volumes, without altering the namespace of the file system. Version 7 was
introduced in VxFS 5.0
VxFS 5.X enables you to mount the following file system disk layouts:
• Disk Layout Version 4
• Disk Layout Version 5
• Disk Layout Version 6
• Disk Layout Version 7
The default layout for VxFS 5.0 is Disk Layout Version 7. Any new file system created using the
VxFS 5.0
mkfs command has Disk Layout Version 7, unless explicitly specified
• Do not upgrade / and /stand file systems to Disk Layout Version 6 or Disk Layout
Version 7.
The HP-UX boot loader does not support the Disk Layout Version 6 or Disk Layout 7.
Veritas File System features
• Extent-based allocation
• Extents allow disk I/O to take place in units of multiple blocks if storage is
• allocated in consecutive blocks.
• Extent attributes
• Extent attributes are the extent allocation policies associated with a file.
• Fast file system recovery
• VxFS provides fast recovery of a file system from system failure.
• Extended mount options
o The VxFS file system supports extended mount options to specify enhanced data
integrity modes, enhanced performance modes, temporary file system modes,
improved synchronous writes, and large file sizes.
• Enhanced performance mode
o VxFS provides mount options to improve performance.
• Large files and file systems support