Table of Contents
Advertisement
4.2.2
Format command execution time (minutes)
Maximum (with verify)
Maximum (without verify)
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request
for a Status Byte Transfer to the Initiator (excluding connect/disconnect).
4.2.3
General performance characteristics
Sustainable disk transfer rate*:
Minimum
Maximum
SAS Interface maximum instantaneous transfer rate
Logical block sizes
Default is 512-byte data blocks
Sector sizes variable to 512, 520, 524, and 528 kbytes.
Read/write consecutive sectors on a track
Flaw reallocation performance impact (for flaws reallocated at format time using
the spare sectors per sparing zone reallocation scheme.)
*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or
from the host.
4.3
Start/stop time
The drive accepts the commands listed in the SAS Interface Manual less than 3 seconds after DC power has
been applied.
If the drive receives a NOTIFY (ENABLE SPINUP) primitive through either port and has not received a START
STOP UNIT command with the START bit equal to 0, the drive becomes ready for normal operations within 30
seconds (excluding the error recovery procedure).
If the drive receives a START STOP UNIT command with the START bit equal to 0 before receiving a NOTIFY
(ENABLE SPINUP) primitive, the drive waits for a START STOP UNIT command with the START bit equal to 1.
After receiving a START STOP UNIT command with the START bit equal to 1, the drive waits for a NOTIFY
(ENABLE SPINUP) primitive. After receiving a NOTIFY (ENABLE SPINUP) primitive through either port, the
drive becomes ready for normal operations within 30 seconds (excluding the error recovery procedure).
If the drive receives a START STOP UNIT command with the START bit and IMMED bit equal to 1 and does
not receive a NOTIFY (ENABLE SPINUP) primitive within 5 seconds, the drive fails the START STOP UNIT
command.
The START STOP UNIT command may be used to command the drive to stop the spindle. Stop time is 30 sec-
onds (maximum) from removal of DC power.
There is no power control switch on the drive.
12
ST3400755SS
180
100
54 Mbytes/sec
97 Mbytes/sec
300 Mbytes/sec* per port
(dual port = 600 Mbytes/sec*)
Yes
Negligible
Cheetah NS SAS Product Manual, Rev. A
Advertisement
Table of Contents
