Product manual
SAVVIO 10K.6 SAS PRODUCT MANUAL, REV. C 9
4.0 PERFORMANCE CHARACTERISTICS
This section provides detailed information concerning performance-related characteristics and features of Savvio drives.
4.1 INTERNAL DRIVE CHARACTERISTICS
ST900MM0006 ST600MM0006 ST450MM0006 ST300MM0006
ST900MM0026 ST600MM0026 ST450MM0026 ST300MM0026
ST900MM0046 ST600MM0046 ST450MM0046 ST300MM0046
ST900MM0036
Drive capacity 900 600 450 300 GB (formatted, rounded off value)
Read/write data heads 6 4 3 2
Bytes per track 997.9 997.9 997.9 997.9 KBytes (avg, rounded off values)
Bytes per surface 151,674 151,674 151,674 151,674 MB (unformatted, rounded off value)
Tracks per surface (total) 152 152 152 152 KTracks (user accessible)
Tracks per inch 279 279 279 279 KTPI (average)
Peak bits per inch 1925 1925 1925 1925 KBPI
Areal density 538 538 538 538 Gb/in2
Disk rotation speed 10K 10K 10K 10K rpm
Avg rotational latency 2.9 2.9 2.9 2.9 ms
4.2 PERFORMANCE CHARACTERISTICS
See Section 11.4.1, "SAS physical interface" on page 58 and the SAS Interface Manual (part number 100293071) for
additional timing details.
4.2.1 Format command execution time for 512-byte sectors (minutes)
Maximum (with verify)
184 122 91 61
Maximum (without verify)
91 61 46 31
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.
4.2.2 General performance characteristics
Minimum sector interleave 1 to 1
Data buffer to/from disk media (one 512-byte logical block)* 1.44 to 2.35 Gb/s
Sustained transfer rate 119 to 195 MiB/s **
125 to 204 MB/s
SAS Interface maximum instantaneous transfer rate 600 MB/s* per port
(dual port = 1200 MB/s*)
Logical block sizes
512 (default), 520, 524 or 528.
Read/write consecutive sectors on a track Yes
Flaw reallocation performance impact (for flaws reallocated at format time using the
spare sectors per sparing zone reallocation scheme.)
Negligible
Average rotational latency 2.9ms
*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or
from the host.
** MiB/s x 1.048 = MB/s
900GB models 600GB models 450GB models 300GB models