Sun Microsystems StorageTek 9985V, Руководство пользователя

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Term Definition
RAS Reliability, availability, and serviceability. Reliability is a measure of the
likelihood that problems will occur. A highly reliable system has few problems.
Once a problem occurs, availability is the measure of how the system protects
the user from being adversely affected by the problem. Serviceability is a
measure of how easy it is to repair the problem.
Read-ahead
Sequential data read from disk into cache without having actually been
requested by the application host, in anticipation that it will be requested by the
host. When the request occurs, it can be serviced as a low latency cache hit,
thus improving host application performance.
Reconstruction
The process of rebuilding lost data on a replacement disk after a disk failure.
Redundancy
Duplication for the purpose of achieving fault tolerance. Refers to duplication
or addition of components, data, and functions within the array.
Rolling snapshot
pattern The creation of a series of snapshots in which the oldest snapshot is replaced
each time a new snapshot is taken. For example, a weekly rolling snapshot
pattern would cause this Tuesday's snapshot to replace last Tuesday's snapshot,
this Wednesday's snapshot to replace last Wednesday's snapshot, etc.
SAN
Storage area network. SAN architecture uses high-performance, high-capacity
Fibre Channel switches to connect storage islands to servers. This approach
provides physical connectivity, facilitating information sharing, or simplifying
management across servers.
SCSI Small computer systems interface. An ANSI standard for controlling peripheral
devices by one or more host computers.
Serial transmission
Data communication mode where bits are sent in sequence in a single fiber.
SFC
See Switch Fabric Cards.
SFP
Small form pluggable.
SIO
See Storage I/O Cards.
Snapshot
A point-in-time copy of volume data, created using copy-on-write technology.
Snapshot reserve space Disk space reserved for Copy-on-Write data.
Snapshot rollback
The process of applying saved changes from a snapshot copy to a primary
volume. The most common application of this feature is to roll the primary
volume back to the state it was in at the time the snapshot was taken.
(Snapshot) update Modify an existing snapshot to contain data currently in the primary volume.
This feature is typically used when updating the oldest snapshot to be the newest
in a rolling snapshot pattern. Note (for developers): The DSP refers to this
operation as a snapshot "reset".
SNMP
Simple network management protocol. A simple protocol designed to allow
networked entities (for example, hosts, routers) to exchange monitoring
information.
SRC
See Storage Resource Card.
SVP
See Storage Service Processor.
Storage domain
A logical domain with its own storage, and its own management environment.
Storage extent
See Extent.
Storage pool
A collection of disks, virtual disks or storage extents, generally with common
configuration, availability, and performance characteristics, that can be carved
into volumes.
Storage profile
See Profile.
Storage Resource Cards
(SRC)
Processing cards in the DSP, which mate with SIO cards.
Storage Service
Processor (SVP) The management device integrated into storage systems that provide unified
management access to system components and remote management
functionality.
Just the Facts October 2007 181
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