Grass Valley K2 Level 3 RAID Dec.09 2005 - Manual (Page 59)

November 23, 2005 Level 3 RAID Instruction Manual 59
PLDA (private loop direct attach) profile
A standard for FC-AL disk drives.
RAID controller (RC)
See RC (RAID controller).
RC (RAID controller)
A printed-circuit board with memory modules and control logic that manages the
storage-system I/O between the K2 Media Server FC adapter and the disk modules.
For higher availability, a K2 Level 3R can use a second RC.
RC memory module
A memory module (DIMM or SIMM) that provides the local storage for an RC.
replace under power
The storage system provides replace under power capability, allowing you to replace,
for example, a disk module or a power supply module without powering down the
storage system. Applications continue while you replace the failed module.
SCSI (small computer system interface)
A well-known protocol and standard for connecting computers and peripheral
devices.
SES (SCSI enclosure services)
A functional subset of SCSI III commands that allow a server to communicate with
storage enclosures using their disk modules.
SFF
Small Form Factor Committee
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.
storage chassis
A storage device that includes a chassis, up to 15 disk modules, one or two RAID
controllers, one LAN card, and one or two power supplies.
storage-system caching
The procedure of storing disk-based data in RAM memory (in this case, DIMM
memory on an RC) temporarily to save time if the data needs to be accessed or
changed again soon.