5.2.2Format command execution time for
| 1TB models | 500GB models |
Maximum (with verify) | 384 | 188 |
Maximum (without verify) | 192 | 94 |
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).
When changing sector sizes, the format times shown above may need to be increased by 30 minutes.
5.2.3General performance characteristics
Minimum sector interleave | 1 to 1 |
Data buffer to/from disk media (one | 84 to 163 MB/s |
Sustained transfer rate | 105 to 115 MB/s |
SAS Interface maximum instantaneous transfer rate | 600 MB/s* per port |
| (dual port = 1200 MB/s*) |
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 | 4.16ms |
*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 20 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 20 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.
12 | Constellation.2 SAS Product Manual, Rev. H |
