Avago Technologies AcceleRAID 170LP - Manual (Page 84)

G-26 AcceleRAID 170LP Installation Guide
enclosure containing one or more SCSI devices. For disk drives, power
supplies, cooling elements, and temperature sensors, the actions performed
are the same as for SAF-TE monitoring. If a UPS is connected to any SES-
monitored enclosures, and an AC failure or two minute warning is reported,
conservative cache is enabled and all system drives are switched to write-
through cache. Primarily used in fibre enclosures.
SIMM
Single In-line Memory Module, RAM packed on a small circuit board with a
defined edge connector. Two SIMMs are required for a 64-bit memory path
on a Pentium processor. See also DIMM.
SMART
Self-Monitoring Analysis and Reporting Technology, the industry standard
reliability prediction indicator for both the ATA/IDE (advanced technology
attachment/integrated drive electronics) and SCSI hard disk drives. Hard
disk drives with SMART offer early warning of some hard disk failures so
critical data can be protected.
Standard Disk Drive
This term refers to a hard disk drive with SCSI, IDE, or other interface,
attached to the host system through a standard disk controller.
Standby Replacement of Disk
See also Hot Spare. One of the most important features the RAID controller
provides to achieve automatic, non-stop service with a high degree of fault-
tolerance. The controller automatically carries out the rebuild operation
when a SCSI disk drive fails and both of the following conditions are true:
A “standby” SCSI disk drive of identical size is found attached to the same
controller;
All of the system drives that are dependent on the failed disk are redundant
system drives, e.g., RAID 1, RAID 3, RAID 5, and RAID 0+1.
Note: The standby rebuild will only happen on the SAME DAC960 controller,
never across DAC960 controllers.