Dell FC4500 Reference Guide - Page 102

Small Form Factor Committee, PLDA private loop

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Glossary node N Any device with a Fibre Channel interface (such as an HBA in a server or a storage system's SP) that connects to a Fibre Channel loop. PDU (power distribution unit) physical disk unit power supply PLDA (private loop direct attach) profile replace under power P A device for the distribution of ac line power from one inlet to multiple outlets. Multiple PDUs - in a rackmount cabinet or deskside storage system - provide higher availability since the power continues if one PDU (or its ac source, if the PDUs use separate ac sources) loses power. Another name for LUN. See LUN (logical unit). An essential element of the storage-system power supply. A storage system can have two power supplies, PS A and PS B. With two, it can survive failure of one supply. You can replace a power supply under power, without interrupting applications. A standard for FC-AL disk drives. R The storage system provides replace under power capability, allowing you to replace, for example, a disk module or a fan module without powering down the storage system. Applications continue while you replace the failed module. SCSI (small computer system interface) server SFF S A well-known protocol and standard for connecting computers and peripheral devices. Some Fibre Channel SPs use a Fibre Channel FC-AL front end to the server and a SCSI back end to the disk modules. The SPs used in DPEs use the Fibre Channel protocol throughout. The array uses SCSI protocol over Fibre Channel. In the context of storage systems, a processor that runs an operating system and uses a disk-array storage system for data storage and retrieval. Small Form Factor Committee g-4 EMC Fibre Channel Disk-Array Processor Enclosure (DPE) Hardware Reference

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g-4
EMC Fibre Channel Disk-Array Processor Enclosure (DPE) Hardware Reference
Glossary
N
node
Any device with a Fibre Channel interface (such as an HBA in a
server or a storage system
’
s SP) that connects to a Fibre Channel
loop.
P
PDU (power
distribution unit)
A device for the distribution of ac line power from one inlet to
multiple outlets. Multiple PDUs
—
in a rackmount cabinet or
deskside storage system
—
provide higher availability since the
power continues if one PDU (or its ac source, if the PDUs use
separate ac sources) loses power.
physical disk unit
Another name for LUN. See LUN (logical unit).
power supply
An essential element of the storage-system power supply. A
storage system can have two power supplies, PS A and PS B.
With two, it can survive failure of one supply. You can replace a
power supply under power, without interrupting applications.
PLDA (private loop
direct attach)
profile
A standard for FC-AL disk drives.
R
replace under
power
The storage system provides replace under power capability,
allowing you to replace, for example, a disk module or a fan
module without powering down the storage system.
Applications continue while you replace the failed module.
S
SCSI (small computer
system interface)
A well-known protocol and standard for connecting computers
and peripheral devices. Some Fibre Channel SPs use a Fibre
Channel FC-AL front end to the server and a SCSI back end to the
disk modules. The SPs used in DPEs use the Fibre Channel
protocol throughout. The array uses SCSI protocol over Fibre
Channel.
server
In the context of storage systems, a processor that runs an
operating system and uses a disk-array storage system for data
storage and retrieval.
SFF
Small Form Factor Committee