Table of Contents
Advertisement
5.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Sav-
vio drives.
5.1
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
Disc rotation speed
Avg rotational latency
5.2
Seek performance characteristics
See Section 12.4.1, "SAS physical interface" on page 67 and the SAS Interface Manual (part number
100293071) for additional timing details.
5.2.1
Access time
Average
900GB models
Single track
3,4
Typical
Full stroke
Average
600, 450, 300GB
Single track
models
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.5 SAS Product Manual, Rev. D
ST9900805SS ST9600205SS ST9450405SS ST9300605SS
ST9900705SS ST9600105SS ST9450305SS ST9300505SS
ST9900605SS ST9600005SS ST9450205SS ST9300405SS
900
600
6
4
821.4
821.4
151,800
151,800
184,799
184,799
300
300
1686
1686
506
506
10K
10K
3.0
3.0
Including controller overhead
Read
3.9
0.4
7.9
3.6
0.4
7.3
450
300
3
2
821.4
821.4
151,800
151,800
184,799
184,799
300
300
1686
1686
506
506
10K
10K
3.0
3.0
1
,
2
(ms)
Not including controller overhead
Write
Read
4.3
3.7
0.6
0.2
8.3
7.7
4.0
3.4
0.6
0.2
7.6
7.1
GB
(formatted, rounded off value)
KBytes
(avg, rounded off values)
MB
(unformatted, rounded off value
Tracks
(user accessible)
KTPI
(average)
kBPI
2
Gb/in
rpm
ms
1,2
(ms)
Write
4.1
0.4
8.1
3.8
0.4
7.4
)
9
Advertisement
Table of Contents
