VERITAS Storage Foundation 4.1 Cluster File System HP Serviceguard Storage Management Suite Extracts, December 2005

VxFS Functionality on Cluster File Systems
4 Installation and Administration Guide
Supported Features
Features and Commands Supported on CFS
Quick I/O The Quick I/O for Databases feature, using clusterized Oracle Disk
Manager (ODM), is supported on CFS. 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 Snapshots are supported on cluster file systems.
Quotas Quotas are supported on cluster file systems.
NFS mounts You can mount cluster file systems to NFS.
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 CFS. See the mmap(2) manual page for more information on mapping
memory pages.
Disk layout versions CFS supports only disk layout Version 4, 5 or 6. Cluster mounted file
systems cannot be upgraded, but 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.
Locking Advisory file and record locking are supported on CFS. 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 CFS. See the fcntl(2) manual page for more information
on record and file locking.