IBM DTTA-351010 Hard Drive Specifications - Page 21

Throughput

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3.3.5 Throughput 3.3.5.1 Simple Sequential Access Operation Sequential Read (Zone 0) Sequential Read (Zone 7) Figure 12. Simple Sequential Access Performance DTTA-35xxxx typical / max. 1.4 sec / 1.5 sec 2.6 sec / 2.7 sec DTTA-37xxxx typical / max. 1.3 sec / 1.4 sec 2.2 sec / 2.3 sec | The above table gives the time required to read for a total of 8000x consecutive blocks (16,777,216 bytes) | accessed by 128 read commands. Typical and Max values are given by 105% and 110% of T respectively throughout following performance description. Note: Assumes a host system responds instantaneously and host data transfer is faster than sustained data rate. | T = A + B + C + 16,777,216/D + 512/E + DRQ where: T = Calculated Time (sec) A = Command Process Time (Command overhead) (sec) B = Average Seek Time (sec) C = Average Latency (sec) D = Sustained Disk Buffer Transfer Rate (byte/sec) E = Buffer Host Transfer Rate (byte/sec) DRQ = Data ReQuest interval (sec) 3.3.5.2 Random Access Operation Random Read ( typical / max ) DTTA-35xxxx 63 sec / 66 sec DTTA-37xxxx 58 sec / 60 sec | The above table gives the time required to execute a total of 1000x read commands which access a random LBA. | T = (A + B + C + 512/D + 512/E + DRQ) * 4096 where: T = Calculated Time (sec) A = Command Process Time (Command overhead) (sec) B = Average Seek Time (sec) C = Latency (sec) D = Average Sustained Disk Buffer Transfer Rate (byte/sec) E = Buffer Host Transfer Rate (byte/sec) DRQ = Data ReQuest interval (sec) Drive Characteristics 13

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3.3.5
Throughput
3.3.5.1
Simple Sequential Access
Figure 12. Simple Sequential Access Performance
|
The above table gives the time required to read for a total of 8000x consecutive blocks (16,777,216 bytes)
|
accessed by 128 read commands.
Typical and Max values are given by 105% and 110% of T respectively
throughout following performance description.
Note:
Assumes a host system responds instantaneously and host data transfer is faster than sustained data
rate.
|
T = A + B + C + 16,777,216/D + 512/E + DRQ
where:
T = Calculated Time (sec)
A = Command Process Time
(Command overhead) (sec)
B = Average Seek Time (sec)
C = Average Latency (sec)
D = Sustained Disk Buffer Transfer Rate (byte/sec)
E = Buffer Host Transfer Rate (byte/sec)
DRQ = Data ReQuest interval (sec)
3.3.5.2
Random Access
|
The above table gives the time required to execute a total of 1000x read commands which access a random
LBA.
|
T = (A + B + C + 512/D + 512/E + DRQ) * 4096
where:
T = Calculated Time (sec)
A = Command Process Time
(Command overhead) (sec)
B = Average Seek Time (sec)
C = Latency (sec)
D = Average Sustained Disk Buffer Transfer Rate (byte/sec)
E = Buffer Host Transfer Rate (byte/sec)
DRQ = Data ReQuest interval (sec)
Operation
DTTA-35xxxx
typical / max.
DTTA-37xxxx
typical / max.
Sequential Read (Zone 0)
1.4 sec / 1.5 sec
1.3 sec / 1.4 sec
Sequential Read (Zone 7)
2.6 sec / 2.7 sec
2.2 sec / 2.3 sec
Operation
DTTA-35xxxx
DTTA-37xxxx
Random Read ( typical / max )
63 sec / 66 sec
58 sec / 60 sec
Drive Characteristics
13