G A L A X Y ® A U R O U R A L S C O N F I G U R A T I O N A N D S Y S T E M I N T E G R A T I O N G U I D E
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Section 3 Management
Overall Health:
Indicates the drive Health at the time this command was executed.
Current Drive Temperature:
This is the temperature (in Celcius) at the time the command
was executed.
Drive Trip Temperature:
Indicates the maximum internal temperature that the drive ever
recorded.
Elements in Grown Defect List:
The drive keeps track of different areas that it can not write
to. These are called “surface defects.” There are two defect lists: One is the Manufacturing
Defect List, which contains defects that were found when the manufacturer tested the drives.
This list is fixed and never changes. The other list is called a grown defect list, which is a list of
defects that occurs after the drive leaves the manufacturer. This list only gets bigger, hence
the “grown” name.
Vendor Cache Information:
This is just a category heading which describes the next 5 lines.
Blocks Sent to the Initiator:
In the case of SAS, the host adapter channel is called an
initiator, while the drive itself is the target. This line indicates the number of blocks of data sent
to the initiator – in this case, the blocks are 512 bytes (sectors), however they may or may not
be data from the disk – they could also be SMART data such as the one which was requested
here. Most of the time, these are drive data sectors, so in general, this is the number of
sectors that has ever been read from the drive.
Blocks Received from the Initiator:
In general, this is the number of sectors written to the
drive.
Blocks Read from Cache and sent to the Initiator:
This is an indicator of how efficient the
caching is on the drive. If the computer (initiator) requested the same block twice, and it
happened to be in the cache of the drive, then the drive would not have to read it again from
the disks, so in general, this number would be the same or always higher than the Blocks sent
to the Initiator. The higher the number goes, it means the less work the heads on the disks
have to do.
Number of Read or Write Commands who's size <= Segment Size
: The drive only sends
data to the computer in groups of blocks, into an area of the cache, called a cache segment. If
the commands being sent or the data being sent back is smaller or the same size as a cache
segment, it would register here. This number doesn't necessarily indicate something good or
bad – just a number of commands sent which were not the same size or smaller than the
cache segment – most are not.
Number of Read or Write Commands who's size > Segment Size:
This indicates data or
commands which had to be broken up into multiple transfers to send to the drive or the
computer. This doesn’t mean anything good or bad.
Vendor (Factory) Information:
This is a category heading for the next two lines.
Number of Hours Powered Up:
This indicates how long a drive has been powered up (in
hours), regardless of whether or not it was reading or writing – even just sitting idle counts as
being powered up. In fact, if the drive had power and was put to sleep, it would also be
counted here.
Number of Minutes until next SMART test:
The drive has two diagnostic tests. One is a
quick test, which only takes a few seconds, and is run by the drive itself (if not manually
triggered). The other is a full surface scan, which is only initiated by the user. In this example,
there is 1 minute until the drive is going to run the quick test on itself. The quick test is how the
drive updates this information.
