HP UX Serviceguard Storage Management Software manual VxFS Functionality on Cluster File Systems

Technical Overview

VxFS Functionality on Cluster File Systems

VxFS Functionality on Cluster File Systems

The HP Serviceguard Storage Management Suite uses the Veritas File System (VxFS). Most of the major features of VxFS local file systems are available on cluster file systems, including:

•Extent-based space management that maps files up to 1 terabyte in size

•Fast recovery from system crashes using the intent log to track recent file system metadata updates

•Online administration that allows file systems to be extended and defragmented while they are in use

Supported Features

The following table lists the features and commands that are available and supported with CFS. Every VxFS online manual page has a Cluster File System Issues section that informs you if the command functions on cluster-mounted file systems, and indicates any difference in behavior from how the command functions on local mounted file systems.

Table 1-1	CFS Supported Features
		Features and Commands Supported on CFS
	Quick I/O	The clusterized Oracle Disk Manager (ODM) is supported with CFS
		using the Quick I/O for Databases feature in the following HP
		Serviceguard Storage Management Suite CFS bundles for Oracle:
		For HP-UX 11i v2 - T2776CA, T2777CA, T2796CA, and T2797CA
		For HP-UX 11i v3 - T2776CB, T2777CB, T8686CB, T8687CB,
		T8696CB, and T8697CB
	Storage	Storage Checkpoints are supported with CFS.
	Checkpoints
	Freeze and	Synchronizing operations, which require freezing and thawing file
	Thaw	systems, are done on a cluster-wide basis.
	Snapshots	Snapshots are supported with CFS.
	Quotas	Quotas are supported with CFS.
	NFS Mounts	You can mount cluster file systems to NFS.
	Memory	Shared memory mapping established by the map() function is
	Mapping	supported on CFS. See the mmap(2) manual page.
	Concurrent	This feature extends current support for concurrent I/O to cluster file
	I/O	systems. Semantics for concurrent read/write access on a file in a
		cluster file system matches those for a local mount.
	Delaylog	The -o delaylog mount option is supported with cluster mounts.
		This is the default state for CFS.

Chapter 1 9