VERITAS File System 3.5 (HP OnlineJFS/JFS 3.5) Release Notes

New and Changed Features

Chapter 1

Storage Checkpoints serve as the enabling technology for two other VERITAS

features: Block-Level Incremental Backups and Storage Rollback, which are used

extensively for backing up databases. (Storage Checkpoints are licensed only with

VERITAS FlashSnap or with VERITAS Editions products. For information on how

to obtain these products, contact your VERITAS sales representative).

New features and other general improvements include the following:

— Storage Checkpoints are now writable, and can be created, mounted, and

removed with the new fsckptadm utility and an added option to the mount

command.

— Performance enhancements in maintaining data Storage Checkpoints (Storage

Checkpoints that are complete images of the ﬁle system) makes using the

Storage Rollback feature easier and more efﬁcient, therefore more viable for

backing up large databases.

— Multi-ﬁle system Storage Checkpoint creation allows database backups without

having to shut down the database.

• Parallel Log Replay

The fsck -o p option and fsck -P option allow a log replay on multiple ﬁle systems

in parallel. The parallel fsck functionality improves system start-up times.

• New VxFS Directory Name Lookup Cache (DNLC)

The new DNLC caches ﬁlenames less than or equal to 32 characters instead of 39

characters as in VxFS 3.3. The global variables ncsize and vx_ncsize have no

impact on the size of the VxFS 3.5 DNLC, which is sized by vxfs_ninode.

• New VxFS Buffer Cache for Meta-data Only

This buffer cache can be tuned with vx_bc_bufhw global tunable. The default size is

based on the memory size.