5.2.2Format command execution time for
Maximum (with verify) | 216 |
Maximum (without verify) | 108 |
Note. There is approximately a 1.5 increase in time to format a SED drive versus a
5.2.3General performance characteristics
Minimum sector interleave | 1 to 1 |
Data buffer to/from disc media (one | 75 to 142 MBytes/sec |
Sustained transfer rate | 95 to 100 Mbytes/sec |
SAS Interface maximum instantaneous transfer rate | 600 Mbytes/sec* per port |
| (dual port = 1200 Mbytes/sec*) |
Logical block sizes |
|
512 (default), 520 or 528. |
|
Read/write consecutive sectors on a track | Yes |
Flaw reallocation performance impact (for flaws reallocated at format time using the | Negligible |
spare sectors per sparing zone reallocation scheme.) |
|
Average rotational latency | 4.16 msec |
*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or from the host.
5.3Start/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 20 sec- onds (maximum) from removal of DC power. SCSI stop time is 20 seconds. There is no power control switch on the drive.
Constellation SAS Product Manual, Rev. E | 11 |
