Veritas Storage Foundation 5.0.1 Cluster File System Administrator's Guide Extracts for the HP Serviceguard Storage Management Suite on HP-UX 11i v3

Table 1-1 CFS Supported Features (continued)
Features and Commands Supported on CFS
Synchronizing operations, which require freezing and thawing file systems, are done on a
cluster-wide basis.
Freeze and Thaw
Snapshots are supported with CFS.Snapshots
Quotas are supported with CFS.Quotas
You can mount cluster file systems to NFS.NFS Mounts
Shared memory mapping established by the map()function is supported on CFS. See the
mmap(2) manual page.
Memory Mapping
This feature extends current support for concurrent I/O to cluster file systems. Semantics for
concurrent read/write access on a file in a cluster file system matches those for a local mount.
Concurrent I/O
The -o delaylog mount option is supported with cluster mounts. This is the default state
for CFS.
Delaylog
CFS supports only disk layout Version 6 and Version 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.
Disk Layout
Versions
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.
Locking
With this feature, CFS moves from a primary/secondary architecture, where only one node in
the cluster processes metadata operations (file creation, deletion, growth, etc.) to a symmetrical
architecture, where all nodes in the cluster can simultaneously process metadata operations.
This allows CFS to handle significantly higher metadata loads.
Multiple
Transaction Servers
See the HP Serviceguard Storage Management Suite Release Notes in the High Availability section at
http://www.docs.hp.com for more information on bundle features and options.
Unsupported Features
Functionality that is documented as unsupported may not be expressly prevented from operating
on CFS, but the actual behavior is indeterminate. HP does not advise using unsupported
functionality on CFS, or to alternately mount file systems with unsupported features as local
and cluster mounts.
Table 1-2 CFS Unsupported Features
Features and Commands Not Supported on CFS
Quick log is not supported on CFS.
qlog
Swap files are not supported on CFS.Swap Files
You cannot use the mknod command to create devices on CFS.The mknod command
Cache advisories are set with the mount command on individual file systems, but are not
propagated to other nodes of a cluster.
Cache Advisories
This Quick I/O for Databases feature that caches data in the file system cache is not supported
on CFS.
Cached Quick I/O
VxFS Functionality on Cluster File Systems 11