G-26
RAID EzAssist User’s Manual
Ready: A SCSI disk drive is in a “ready” state if it is powered on and is
available to be configured during the current session but remains
unconfigured.
Online: A SCSI disk drive is in an “online” state if is powered on, has been
defined as a member of a drive group; and is operating properly.
Standby: A SCSI disk drive is in a “standby” state if it is powered on, is able
to operate properly, and was NOT defined as part of any drive group.
Dead: A SCSI disk drive is in a “dead” state if it is not present; or if it is
present but not powered on; or if it failed to operate properly and was ‘killed’
by the controller. When the controller detects a failure on a disk, it “kills”
that disk by changing its state to “dead.” A SCSI drive in a dead state does
not participate in any I/O activity. No commands are issued to dead drives.
Rebuild: A SCSI disk drive is in a “rebuild” state while it is in the process of
being rebuilt. During this process, data is regenerated and written to the disk
drive. This state is also referred to as ‘Write-Only’ (WRO).
SCSI Interrupt Steering Logic (SISL)
This is the architecture that allows a RAID controller, such as AcceleRAID
to implement RAID on a system board-embedded SCSI bus or a set of SCSI
busses.
SDRAM
Synchronous Dynamic Random Access Memory, a new form of dynamic
random access memory (DRAM) that can be coordinated or synchronized to
the clock speed of the computer.
Sector
The minimum addressable storage unit in which data is physically stored in a
hard disk. Typically a sector is 512 bytes in size.
Segment Size
See Cache Line Size
