Veritas Storage Foundation 5.1 SP1 Cluster File System Administrator"s Guide (5900-1738, April 2011)

Table 1-1

Veritas File System features in cluster file systems (continued)

DescriptionFeatures

Shared memory mapping established by the mmap() function is

supported on SFCFS.

See the mmap(2) manual page.

Memory mapping

Currently, only the Version 5, 6, 7, and 8 disk layouts can be created,

and only the Version 4, 5, 6, 7, and 8 disk layouts can be mounted.

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 older disk layout version.

Disk layout

versions

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.

Locking

Veritas File System features not in cluster file systems

Table 1-2 describes functionality as not supported and may not be expressly

prevented from operating on cluster file systems, but the actual behavior is

indeterminate.

It is not advisable to use unsupported functionality on SFCFS, or to alternate

mounting file systems with these options as local and cluster mounts.

Table 1-2

Veritas File System features not in cluster file systems

CommentsUnsupported

features

Quick log is not supported.qlog

Swap files are not supported on cluster mounted file system.Swap files

The mknod command cannot be used to create devices on a cluster

mounted file system.

mknod

Cache advisories are set with the mount command on individual file

systems, but are not propagated to other nodes of a cluster.

Cache advisories

Technical overview of Storage Foundation Cluster File System

About Veritas File System features supported in cluster file systems