Veritas Storage Foundation 5.1 SP1 Cluster File System Release Notes (5900-1509, April 2011)

in a file system. This is useful when a file system is shared by a set of users or
applications or the data is classified into different levels of importance in the
same file system.
See the Veritas Storage Foundation Advanced Features Administrator's Guide.
Partitioned directories
Normally, a large volume of parallel threads performing access and updates on a
directory that commonly exist in an file system suffers from exponentially longer
wait times for the threads. This feature creates partitioned directories to improve
the directory performance of file systems. When any directory crosses the tunable
threshold, this feature takes an exclusive lock on the directory inode and
redistributes the entries into various respective hash directories. These hash
directories are not visible in the name-space view of the user or operating system.
For every new create, delete, or lookup thread, this feature performs a lookup for
the respective hashed directory (depending on the target name) and performs the
operation in that directory. This leaves the parent directory inode and its other
hash directories unobstructed for access, which vastly improves file system
performance.
See the Veritas File System Administrator's Guide.
SmartTier sub-file movement
In this release, the Dynamic Storage Tiering (DST) feature is rebranded as
SmartTier. With the SmartTier feature, you can now manage the placement of
file objects as well as entire files on individual volumes.
See the Veritas Storage Foundation Advanced Features Administrator's Guide and
the fsppadm(1M) manual page.
Tuning performance optimization of inode allocation
You can now set the delicache_enable tunable parameter, which specifies whether
performance optimization of inode allocation and reuse during a new file creation
is turned on or not.
See the Veritas File System Administrator's Guide and the vxtunefs(1M) manual
page.
Veritas File System is more thin friendly
You can now tune Veritas File System (VxFS) to enable or disable thin-friendly
allocations.
17Storage Foundation Cluster File System Release Notes
Changes introduced in 5.1 SP1