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Supported features

Supported features describes the supported features and commands for SFCFS.

Supported features



Quick I/O for databases 

The Quick I/O for Databases feature, using clusterized Oracle Disk Manager (ODM), is supported on SFCFS. Quick I/O is licensable only through Veritas Database Editions products. 

Storage Checkpoints 

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


Snapshots are supported on cluster file systems. 


Quotas are supported on cluster file systems.  

NFS mounts 

You can mount cluster file systems to NFS. 

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. 

Freeze and thaw 

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

Memory mapping 

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

See the mmap(2) manual page. 

Disk layout versions  

SFCFS supports only disk layout Version 6 and 7. Cluster mounted file systems can be upgraded, a local mounted file system can be upgraded, unmounted, and mounted again as part of a cluster. Use the fstyp -v special_device command to ascertain the disk layout version of a VxFS file system. Use the vxupgrade command to update the disk layout version. 


Advisory file and record locking are supported on SFCFS. 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 SFCFS.  

See the fcntl(2) manual page.