5.2.2Format command execution time for
| 2TB models | 1TB models | 500GB models |
Maximum (with verify) | 627 | 345 | 173 |
|
|
| |
Maximum (without verify) | 314 | 173 | 86 |
|
|
|
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 | 95 to 212 MB/s |
Sustained transfer rate | 60 to 147 MB/s |
SAS Interface maximum instantaneous transfer rate | 600MB/s* per port |
| (dual port = 1200MB/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 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 ES.1 SAS Product Manual, Rev. E | 11 |
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