Intel SRCU31, User Manual

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90 Intel RAID SRCU31 Users Guide
The Reassigns Counter
The Reassigns counter records the number of media defects which occur on a hard disk drive.
Defective blocks of a hard disk drive are assigned substitute blocks (spare blocks) that are either on
the same track, or on alternate ones if all spare blocks on the same track are already in use. The
administration of the reassignments is carried out by the hard disk drive through reassignment
tables. If you observe that the number of reassigns is constantly increasing, you may assume that
something is wrong with the drive.
If a hard disk drive works with alternate tracks, it is generally no longer suitable for applications
with high performance expectations. Whenever a defective block is being accessed, the read/write
actuator has to move to an alternate position and this requires extra time.
The Grown Defects Counter
The Grown Defects counter records the number of media defects that have occurred since the
device was first operated with an Intel RAID Controller SRCU31. A hard disk drive is in good
condition when it has 0 grown defects. Any value greater than 0 indicates a grown defect
condition. For more information on grown defects see Chapter 7, View Status/Defects.
Last Status
Last Status information should always be 0x00000000. After a device failure or other significant
events, a different value may be displayed here. This value is volatile and is reset to 0x00000000
after each power up and/or reset. If you press <Enter> on a Drive, StorCon displays additional
information on the SCSI parameter settings, as shown in Figure 21.
Figure 21. Hard Disk Drive Last Status