Seagate ST800FM0022 Pulsar.2 SAS Product Manual - Page 16

Performance Characteristics

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4.0 PERFORMANCE CHARACTERISTICS This section provides detailed information concerning performance-related characteristics and features of Pulsar.2 drives. Note. Data provided is based on format at 512-bytes. 4.1 INTERNAL DRIVE CHARACTERISTICS Drive capacity Flash Memory Type Emulated LBA Size Native Programmable Page Size Default Transfer Alignment Offset 800400 200100 GB (formatted, rounded off value) NAND MLC 512, 520, 524, 528, 4096, 4160, 4192, or 4224 8192 User Bytes 0 4.2 PERFORMANCE CHARACTERISTICS See Section 11.4.1, "SAS physical interface" and the SAS Interface Manual (part number 100293071) for additional timing details. 4.2.1 Access time Access measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The specifications in the table below are defined as follows: • Page-to-page access time is an average of all possible page-to-page accesses in both directions for a sequentially preconditioned drive. • Average access time is a true statistical random average of at least 5000 measurements of accesses between programmable pages on a randomly preconditioned drive. Table 4 Typical Access Time (μsec) 800GB 1,2 400, 200, 100 GB 1,2 READ WRITE READ WRITE Average Page to Page 293 137 227 120 Typical 3 62 136 60 120 Average Latency 273 206 1. Execution time measured from receipt of the Command to the Response. 2. Assumes no errors. 3. Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives. Note. 2. 4.2.2 These drives are designed to provide the highest possible performance under typical conditions. However, due to the nature of Flash memory technologies there are many factors that can result in values different than those stated in this specification FORMAT UNIT command execution time for 512-byte LBA's (minutes) The device may be formatted as either a Thin Provisioned device or a Fully Provisioned device. The default format is Thin Provisioned and is recommended for most applications. Thin Provisioning provides the most flexibility for the device to manage the flash medium to maximize endurance. Table 5 Maximum FORMAT UNIT Times (minutes) CONFIGURATION Format Mode Non-SED (Default) Thin Provisioned Non-SED (Default) Thin Provisioned Non-SED Fully Provisioned Non-SED Fully Provisioned SED (Default) Thin Provisioned SED (Default) Thin Provisioned SED Fully Provisioned SED Fully Provisioned DCRT Bit IP Bit 800GB 400GB 200GB 100GB DCRT = 0 IP = 0 5 5 5 5 DCRT = 1 IP = 0 5 5 5 5 DCRT = 0 IP = 1 430 130 70 60 DCRT = 1 IP = 1 280 100 50 30 DCRT = 0 IP = 0 5 N/A N/A N/A DCRT = 1 IP = 0 5 N/A N/A N/A DCRT = 0 IP = 1 430 N/A N/A N/A DCRT = 1 IP = 1 280 N/A N/A N/A PULSAR.2 SAS PRODUCT MANUAL, REV. C 10

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P
ULSAR
.2 SAS P
RODUCT
M
ANUAL
, R
EV
. C
10
4.0
P
ERFORMANCE CHARACTERISTICS
This section provides detailed information concerning performance-related characteristics and features of Pulsar.2 drives.
Note.
Data provided is based on format at 512-bytes.
4.1
I
NTERNAL DRIVE CHARACTERISTICS
Drive capacity
800400
200100
GB
(formatted, rounded off value)
Flash Memory Type
NAND MLC
Emulated LBA Size
512, 520, 524, 528, 4096, 4160, 4192, or 4224
Native Programmable
Page Size
8192 User Bytes
Default Transfer
Alignment Offset
0
4.2
P
ERFORMANCE CHARACTERISTICS
See Section 11.4.1, "SAS physical interface" and the
SAS Interface Manual
(part number 100293071) for additional timing details.
4.2.1
Access time
Access measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The
specifications in the table below are defined as follows:
•
Page-to-page access time is an average of all possible page-to-page accesses in both directions for a sequentially preconditioned
drive.
•
Average access time is a true statistical random average of at least 5000 measurements of accesses between programmable
pages on a randomly preconditioned drive.
4.2.2
FORMAT UNIT command execution time for 512-byte LBA’s (minutes)
The device may be formatted as either a Thin Provisioned device or a Fully Provisioned device. The default format is Thin Provisioned and
is recommended for most applications. Thin Provisioning provides the most flexibility for the device to manage the flash medium to
maximize endurance.
Table 5
Maximum FORMAT UNIT Times
(minutes)
C
ONFIGURATION
Format Mode
DCRT Bit
IP Bit
800GB
400GB
200GB
100GB
Non-SED
(Default) Thin Provisioned
DCRT = 0
IP = 0
5
5
5
5
Non-SED
(Default) Thin Provisioned
DCRT = 1
IP = 0
5
5
5
5
Non-SED
Fully Provisioned
DCRT = 0
IP = 1
430
130
70
60
Non-SED
Fully Provisioned
DCRT = 1
IP = 1
280
100
50
30
SED
(Default) Thin Provisioned
DCRT = 0
IP = 0
5
N/A
N/A
N/A
SED
(Default) Thin Provisioned
DCRT = 1
IP = 0
5
N/A
N/A
N/A
SED
Fully Provisioned
DCRT = 0
IP = 1
430
N/A
N/A
N/A
SED
Fully Provisioned
DCRT = 1
IP = 1
280
N/A
N/A
N/A
Table 4
Typical Access Time (
μ
sec)
800GB
1
,
2
1.
Execution time measured from receipt of the Command to the Response.
2.
Assumes no errors.
3.
Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a
representative sample of drives.
Note.
These drives are designed to provide the highest possible performance under typical conditions.
However, due to the nature of Flash memory technologies there are many factors that can result in
values different than those stated in this specification
2.
400, 200, 100 GB
1,2
R
EAD
W
RITE
R
EAD
W
RITE
Average
Typical
3
293
137
227
120
Page to Page
62
136
60
120
Average Latency
273
206