Installation Guide

it. The SmartMove feature uses VxFS information to detect free extents and avoids copying
them.
• Dynamic Storage Tiering Enhancements
The Dynamic Storage Tiering (DST) feature provides the following enhancements:
◦ Enhanced DST APIs to provide a new interface for managing allocation policies of storage
checkpoints during creation and later, and for managing named data stream allocation
policies
◦ fsppadm support for user ID (UID), group ID (GID), and tagging (TAG) elements in the
placement policy XML file
◦ Improved scan performance in the fsppadm command
◦ Suppressed processing of the chosen RULE
◦ Parser support for UID, GID, and TAG elements in a DST policy
◦ What-if support for analyzing and enforcing without requiring the policy to be assigned
◦ Storage Checkpoint data placement support in a DST policy
◦ Shared DB thread handle support
◦ CPU and I/O throttling support for DST scans
◦ New command, fstag, for file tagging
◦ New command, fsppmk, for creating XML policies
• Availability of the mntlock and mntunlock Mount Options
You can specify the mntlock option with the mount command to prevent a file system from
being unmounted by an application.
• Autolog replay on mount
Starting with the VxFS 5.1 SP1 release, when the mount command detects a dirty log in the
file system, it will automatically run the VxFS command fsck to clean up the intent log. This
functionality is only supported on file systems mounted on a Veritas Volume Manager (VxVM)
volume.
• FileSnap
FileSnaps provide the ability to snapshot objects that are smaller in granularity than a file
system or a volume. This is an Enterprise level feature. It is supported only with DLV 8
filesystems.
• SmartTier sub-file movement
The Dynamic Storage Tiering (DST) feature is now rebranded as SmartTier. With the SmartTier
feature, you can now manage the placement of file objects as well as entire files on individual
volumes.
• Tuning performance optimization of inode allocation
Starting with the VxFS 5.1 SP1 release, you can optimize the way in which inodes are reused
in inode cache by setting the delicache_enable tunable parameter. It specifies whether
performance optimization of inode allocation and reuse during a new file creation is turned
on or not.
• Veritas File System is more thin-friendly tunable
Thin Provisioning is a storage array feature that optimizes storage use by automating storage
provisioning. Administrators do not have to estimate how much storage an application requires.
Instead, Thin Provisioning lets administrators provision large thin or thin reclaim capable LUNs
20 Introduction