StoneFly ISC Setup Guide
Glossary
V8.0.3x
© StoneFly Inc. | All rights reserved
Page 50
StoneFly Replicator
TM
software provides storage-independent replication that operates at the
block level over an iSCSI network. Replicator supports local and remote replication and can
operate synchronously or asynchronously.
StoneFly Mirroring
TM
synchronous mirroring feature supplies host-independent mirrored
data storage that duplicates production data onto physically separate mirrored target images
transparently to users, applications, databases, and host processors. Synchronous mirroring
implies that the
Storage Concentrator
waits for a write-complete acknowledgment from all
volumes before presenting a write completion status to the host.
Mirror Image
A mirror image contains an exact duplicate of all other images in a mirror volume. A mirror
image is grouped with other mirror images to comprise a mirror volume (each mirror image
contains a duplicate copy of the data). Mirror images can be either local mirrors or they can
be campus mirrors. The size of the mirror image must be equal to the size of all other
images in the mirror volume.
Mirror Volume
A Mirror Volume is composed of multiple mirror images. StoneFly Mirroring supports up to
four mirror images in a mirror volume. The Mirror Volume is what the applications and
hosts see as the storage device.
Mount Directory
Directory in any file system where the top directory of a descendent file system is mounted.
The contents of the mount directory are the contents of the top directory in the mounted file
system. If the mount directory is not empty before the file system is mounted, any existing
files and directories in that directory as well as any descendent directories become invisible
(and inaccessible) until the file system is unmounted.
Mount Point
Synonym for mount directory. The mount point is the location (directory) where a file
system, known to the host system, is mounted. Usually defined in terms of which system the
file system is mounted on and where on that system the file system is mounted.
Network Attached Storage (NAS)
A term used to refer to storage elements that connect to a network and provide file access
services to computer systems. Abbreviated NAS. A NAS Storage Element consists of an
engine, which implements the file services, and one or more devices, on which data is
stored. NAS elements may be attached to any type of network. A class of systems that
provide file services to host computers. A host system that uses network attached storage
uses a file system device driver to access data using file access protocols such as NFS or
CIFS. NAS systems interpret these commands and perform the internal file and device I/O