Installation guide

Software Operation Manual
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5.5.5.14 Write Same Support
Drives that support the Write Same feature (SCT) can write to multiple drive
sectors at once, improving initialization time. To take advantage of this feature,
all the drives in the unit must support Write Same. User can set the “SAS And
SATA”, “SAS Only”, “SATA Only” or “Disabled” for the controller initialization.
5.5.5.15 Capacity Truncation Mode
The RAID subsystem uses drive truncation so that drives from different vendors
are more likely to be usable as spares for one another. Drive truncation slightly
decreases the usable capacity of a drive that is used in redundant units. The
controller provides three truncation modes in the system configuration:
"Multiples Of 10G", "Multiples Of 1G" and "Disabled".
Multiples Of 10G: If you have 120 GB drives from different vendors; chances are
that the capacity varies slightly. For example, one drive might be 123.5 GB, and the
other 120 GB. “Multiples Of 10G” truncates the number under tens. This makes the
same capacity for both of these drives so that one could replace the other.
Multiples Of 1G: If you have 123 GB drives from different vendors; chances are
that the capacity varies slightly. For example, one drive might be 123.5 GB, and the
other 123.4 GB. “Multiples Of 1G” truncates the fractional part. This makes the
same capacity for both of these drives so that one could replace the other.
Example, one drive might be 123.5 GB, and the other 123.4 GB. “Multiples Of 1G”
truncates the fractional part. This makes the same capacity for both of these drives
so that one could replace the other.
Disabled: It does not truncate the capacity.