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4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Sav-
vio drives.
4.1
Internal drive characteristics
Drive capacity
Read/write data heads
Bytes per track
Bytes per surface
Tracks per surface (total)
Tracks per inch
Peak bits per inch
Areal density
Internal data rate
Disc rotation speed
Avg rotational latency
4.2
Seek performance characteristics
See Section 10.4.1, "SAS physical interface" on page 60 and the SAS Interface Manual (part number
100293071) for additional timing details.
4.2.1
Access time
Average
600GB
Single track
3
4
,
Typical
Full stroke
Average
450GB
Single track
3,4
Typical
Full stroke
1.
Execution time measured from receipt of the Command to the Response.
2.
Assumes no errors and no sector has been relocated.
3.
Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as
measured on a representative sample of drives.
4.
Access time = controller overhead + average seek time and applies to all data transfer commands.
Access to data = access time + latency time.
Savvio 10K.4 SAS Product Manual, Rev. C
ST9600204SS
ST9450404SS
ST9600104SS
ST9450304SS
600
450
6
6
677,557
677,557
100,021
75,016
147,620
110,715
240,000
180,000
1,430
1,430
343
257.4
1.62
1.62
10K
10K
3.0
3.0
Including controller overhead
Read
Write
4.0
4.6
0.50
0.76
8.01
8.38
4.0
4.6
0.50
0.76
7.96
8.51
GB (formatted, rounded off value)
Bytes (average, rounded off values)
MB (unformatted, rounded off value)
Tracks (user accessible)
TPI (average)
kBPI
2
Gb/in
Gb/s (variable with zone)
rpm
ms
1
,
2
(ms)
Not including controller overhead
Read
3.8
0.30
7.81
3.8
0.30
7.76
1,2
(ms)
Write
4.4
0.56
8.18
4.4
0.56
8.31
9
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