Infortrend RAID Controller Manual

• head flying height
• data throughput performance
• spin-up time
• re-allocated sector count
• seek error rate
• seek time performance
• spin try recount
• drive calibration retry count
SCSI drives with reliability prediction capability only communicate a
reliability condition as either good or failing. In a SCSI environment,
the failure decision occurs at the disk drive, and the host notifies the
user for action. The SCSI specification provides a sense bit to be
flagged if the disk drive determines that a reliability issue exists. The
system then alerts the user/system administrator.
B. Infortrend's Implementations to S.M.A.R.T.
Infortrend is using ANSI-SCSI Informational Exception Control (IEC)
document X3T10/94-190 standard.
There are four manual selections related to S.M.A.R.T. function in
firmware:
Disable:
S.M.A.R.T. function not activated
Detect Only:
S.M.A.R.T. function enabled, controller will send command to enable
all the drives' S.M.A.R.T. function, if a drive predicts problem,
controller will report the predicted problem in the form of an event
log.
Perpetual Clone:
If the S.M.A.R.T. function is enabled, the controller will send
command to enable all drives' S.M.A.R.T. function. If a drive predicts
problem, controller will report in the form of an event log. Controller
will clone the drive if there is a Dedicated/Global spare drive
available. “The predict failure drive” will not be taken off-line, and
the clone drive will still behave as a standby drive.
If “the predict failure drive” fails, the clone drive will take over
immediately. Under the circumstance that “the predict failure drive“
is still working and another drive in the same logical drive should
fail, the clone drive will perform as a standby spare drive and start to
rebuild the failed drive immediately. This is to prevent a fatal drive
error if yet another drive should fail.
Advanced Configurations 10-21