Deduplication

You can perform post-process periodic deduplication in a file system to eliminate duplicate data without any continuous cost.

See About deduplicating data.

Defragmentation

Free resources are initially aligned and allocated to files in an order that provides optimal performance.

See Defragmentation.

Disk layout versions

SFCFSHA supports only disk layout Version 7, 8 and 9.

Use the fstyp -v special_device command to ascertain the disk layout version of a VxFS file system.

Use the vxupgrade command for to upgrade a mounted file system to disk layout Version 7 or later. Use the vxfsconvert command to upgrade an unmounted file system from disk layout Version 4 to disk layout Version 7 or later.

Fast file system recovery

VxFS provides fast recovery of a file system from system failure.

See Fast file system recovery.

FileSnap

A FileSnap is a space-optimized copy of a file in the same name space, stored in the same file system.

See About FileSnaps.

Freeze and thaw

Synchronizing operations, which require freezing and thawing file systems, are done on a cluster-wide basis.

Locking

Advisory file and record locking are supported on SFCFSHA. For the F_GETLK command, if there is a process holding a conflicting lock, the l_pid field returns the process ID of the process holding the conflicting lock. The nodeid-to-node name translation can be done by examining the /etc/llthosts file or with the fsclustadm command. Mandatory locking, and deadlock detection supported by traditional fcntl locks, are not supported on SFCFSHA.

See the fcntl(2) manual page.

Memory mapping

Shared memory mapping established by the mmap() function is supported on SFCFSHA.

See the mmap(2) manual page.

NFS mounts

You export the NFS file systems from the Cluster. You can NFS export CFS file systems in a distributed highly available way.

Nested Mounts

You can use a directory on a cluster mounted file system as a mount point for a local file system or another cluster file system.

Quick I/O for databases

The Quick I/O for Databases feature, using clusterized Oracle Disk Manager (ODM), is supported on SFCFSHA.

For DB2 and Sybase databases, see the Veritas Storage Foundation Solution Guide.

For Oracle databases, see Veritas Storage Foundation: Storage and Availability Management for Oracle Databases Guide.

Quotas

Quotas are supported on cluster file systems.

Snapshots

Snapshots are supported on cluster file systems.

Storage Checkpoints

Storage Checkpoints are supported on cluster file systems, but are licensed only with other Veritas products.