Veritas File System 5.0 Release Notes (September 2006)

Veritas File System 5.0 Release Notes
New Features
Chapter 110
The following new command is associated with this feature:
fcladm : The fcladm command performs online administration functions for the Veritas File System
File Change Log (FCL) feature. This includes operations such as activating, deactivating, and removing
the FCL, specifying the set of events for tracking, saving and, restoring the FCL file for off-host
processing. Thefcladm command supports creating File Change Log of version 3 or 4. See the fcladm
(1M) for more detailed information.
There are four tunable parameters associated with this feature:
fcl_keeptime Specifies the minimum amount of time, in seconds, that the VxFS File Change Log
(FCL) keeps records in the log.
fcl_maxalloc Specifies the maximum amount of space that can be allocated to the VxFS File
Change Log.
fcl_winterval Specifies the time, in seconds, that must elapse before the VxFS File Change Log
records a data overwrite, data extending write, or data truncate for a file.
fcl_ointerval Specifies the time interval in seconds within which subsequent opens of a file do
notproduce an additional FCL record. This helps to reduce number of repetitive
file-open records logged in the FCL, especially in the case of frequent accesses
through NFS.
See vxtunefs (1M) manpage for more information regarding these tunables.
The FCL feature includes the following functions in the application programming interface (API):
NOTE To enable FCL functionality the HP Online JFS 5.0 license is required.
• File-to-volume and volume-to-file mapping in MVFS
This release provides two new commands to support this feature:
fsmap: This command reports the volume location of all data or indirect extents associated with a file
in a multi-volume file system, and verifies that DST policies are working as requested.
Table 1-1
vxfs_fcl_sync vxfs_fcl_open vxfs_fcl_close
vxfs_fcl_getinfo vxfs_fcl_read vxfs_fcl_getcookie
vxfs_fcl_seek vxfs_fcl_copyrec