Thecus i Series User Manual page 7

Write-Through cache write policy. A caching technique in
WT
which the completion of a write request is not signaled until
data is safely stored on non-volatile media. Each data is
synchronized in both data cache and the accessed physical
disks.
Write-Back cache write policy. A caching technique in which
WB
the completion of a write request is signaled as soon as the
data is in cache and actual writing to non-volatile media
occurs at a later time. It speeds up system write performance
but needs to bear the risk where data may be inconsistent
between data cache and the physical disks in one short time
interval.
Set the volume to be Read-Only.
RO
Dedicated Spare disks. The spare disks are only used by one
DS
specific VG. Others could not use these dedicated spare disks
for any rebuilding purpose.
Global Spare disks. GS is shared for rebuilding purpose. If
GS
some VGs need to use the global spare disks for rebuilding,
they could get the spare disks out from the common spare
disks pool for such requirement.
DC Dedicated Cache.
GC Global Cache.
DeGraded mode. Not all of the array's member disks are
DG
functioning, but the array is able to respond to application
read and write requests to its virtual disks.
Self-Monitoring Analysis and Reporting Technology.
S.M.A.R.T.
WWN World Wide Name.
HBA Host Bus Adapter.
MPIO Multi-Path Input/Output.
Multiple Connections per Session
MC/S
NIC Network Interface Card.
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