Parallel file systems are similar to clustered file systems. They provide
concurrent access to a single file across a number of nodes operating in
parallel. This requires file data to be striped across multiple nodes, as well
as special client software to process all file parts simultaneously.
Companies with large compute clusters can take advantage of the massive
performance scalability inherent in these products. It's important to check
which operating systems a parallel file system supports, as there may be
some limitations outside of Linux.
A global name space (GNS), which provides a single mount point or share
for a number of file systems, is a common feature of the non-traditional
approaches to NAS consolidation. By providing a single share for a
number of file systems, the GNS presents a central management point for
the files under its purview. WSS and some other products can use
Windows' DFS to provide a GNS across several CIFS servers.
Clustered file-system products: PolyServe Inc.'s Matrix Server software
for Linux or Windows offers a clustered file system, as well as a clustered
application server in one package. PolyServe clustered file-system support
is NFS for the Linux Matrix Server and CIFS for the Windows Matrix
Server. In addition to offering clustered file services, each Matrix Server
cluster can also host applications across the cluster.
HP's Enterprise File System (EFS) gateway is based on PolyServe's Matrix
Server software and supplies clustered file services to NFS clients. EFS is
available in Linux and Windows versions. The Windows product supports a
clustered CIFS, but has no support for NFS. The Linux product supports a
clustered NFS, but a single-node CIFS. With its EFS Linux product, CIFS
isn't supported as a clustered file system—not as a single namespace
accessible over the whole cluster. HP said it plans to upgrade Linux EFS
support for CIFS sometime this quarter. Like other cluster offerings, HP's
product offers a single file namespace accessible across all cluster nodes
to NFS.
NetApp's SpinServer is a clustered file system for NFS that currently
doesn't support CIFS. SpinServer exports a single namespace across all
storage nodes, but files aren't striped across nodes. There aren't special
nodes for meta data and storage; instead, all nodes support both meta
data and storage services.
Ibrix, Red Hat Global File System (GFS) and others offer software-only
clustered or parallel file systems. Most of these products require special
client software to be installed and the file system must operate on all
clients accessing file data.
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