3.7.0 HP StorageWorks HP Scalable NAS File Serving Software administration guide - HP Scalable NAS 3.7 for Linux (AG513-96002, October 2009)

8 Configure PSFS filesystems
HP Scalable NAS provides the PSFS filesystem. This direct-access shared filesystem
enables multiple servers to concurrently read and write data stored on shared SAN
storage devices. A journaling filesystem, PSFS provides live crash recovery.
Overview
Filesystem features
Concurrent access by multiple servers
After a PSFS filesystem has been created, all cluster servers having access to the
device via the SAN can mount the filesystem and subsequently perform concurrent
read and/or write operations to that filesystem. A PSFS filesystem must be consistently
mounted either read-only or read-write across the cluster.
Standard filesystem operations and semantics
The PSFS filesystem is a standard Linux filesystem and supports standard filesystem
operations such as mkfs, mount, and umount. These operations can be performed
either with the Management Console or from the command line.
The PSFS filesystem also supports existing applications. It uses standard read/write
semantics and does not require any changes to applications.
The PSFS filesystem does not migrate processes from one server to another. If you
want processes to be spread across servers, you will need to take the appropriate
actions. For example, if you want to spread a kernel build across four servers, you
will need to run a cooperative make.
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