Seagate ST373307FC manual General performance characteristics, Start/stop time, Cache operation

Page 20

10

 

Cheetah 10K.6 FC Product Manual, Rev. B

4.2.3

General performance characteristics

 

 

Minimum sector interleave

1 to 1

 

Data buffer to/from disc media (one 512-byte logical block)*

 

 

Minimum

59 MBytes/sec

 

Average

 

94 MBytes/sec

 

Maximum

105 MBytes/sec

 

Fibre Channel Interface maximum instantaneous transfer rate

1 GHz

2 GHz

 

 

106 Mbytes/sec* per

212 Mbytes/sec* per

 

 

port (dual port = 212

port (dual port = 424

 

 

Mbytes/sec*)

Mbytes/sec*)

Logical block sizes

Default is 512-byte data blocks

Variable 512 to 528 bytes per sector in even number of bytes per sector. If n (number of bytes per sector) is odd, then n-1 will be used.

Read/write consecutive sectors on a track

Yes

Flaw reallocation performance impact (for flaws reallocated at format time

Negligible

using the spare sectors per sparing zone reallocation scheme.)

 

Overhead time for head switch in sequential mode

0.8 msec

 

Overhead time for one track cylinder switch in sequential mode

1.2 msec (typical)

Average rotational latency

2.99 msec

*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or from the host.

4.3Start/stop time

If the Motor Start option is disabled, the drive becomes ready within 20 seconds after DC power is applied. If a recoverable error condition is detected during the start sequence, the drive executes a recovery procedure and the time to become ready may exceed 30 seconds. Stop time is less than 30 seconds (maximum) from removal of DC power.

If the Motor Start option is enabled, the internal controller accepts the commands listed in the Fibre Channel Interface Manual less than 3 seconds after DC power has been applied. After the Motor Start command has been received, the drive becomes ready for normal operations within 20 seconds (excluding the error recovery procedure). The Motor Start command can also be used to command the drive to stop the spindle.

There is no power control switch on the drive.

4.4Prefetch/multi-segmented cache control

The drive provides a prefetch (read look-ahead) and multi-segmented cache control algorithms that in many cases can enhance system performance. Cache refers to the drive buffer storage space when it is used in cache operations. To select this feature, the host sends the Mode Select command with the proper values in the applicable bytes in page 08h. Prefetch and cache operations are independent features from the standpoint that each is enabled and disabled independently using the Mode Select command; however, in actual opera- tion, the prefetch feature overlaps cache operation somewhat as described in sections 4.5.1 and 4.5.2.

All default cache and prefetch mode parameter values (Mode Page 08h) for standard OEM versions of this drive family are given in Table 15.

4.5Cache operation

Note. Refer to the Fibre Channel Interface Manual for more detail concerning the cache bits.

Of the 8,192 kbytes physical buffer space in the drive, 6,877 kbytes can be used as a cache.

Page 19 Page 21
Image 20
Page 19 Page 21
Contents Page Page Page Page Revision status summary sheet Revision Date Writer/Engineer Sheets AffectedPage Contents Defect and error management InstallationSeagate Technology support services Interface requirementsList of Figures Cheetah 10K.6 FC Product Manual, Rev. B ViiPage Scope Cheetah 10K.6 FC family disc driveCheetah 10K.6 FC Product Manual, Rev. B Applicable standards and reference documentation Australian C-Tick Korean MICTaiwanese Bsmi Reference documentsGeneral description Cheetah 10K.6 FC disc driveStandard features Media descriptionPerformance Reliability Factory-installed accessories Factory-installed options User-installed accessories Unformatted and formatted capacitiesCheetah 10K.6 FC Product Manual, Rev. B Performance characteristics Internal drive characteristicsSeek performance characteristics Access time Format command execution time in minutesGeneral performance characteristics Start/stop timePrefetch/multi-segmented cache control Cache operationCaching write data Prefetch operation Reliability specifications Reliability and service Preventive maintenanceService life Service philosophyPerformance impact 7 S.M.A.R.TControlling S.M.A.R.T Milliseconds Reporting controlDetermining rate Predictive failuresState of the drive prior to testing ImplementationInvoking DST Short and extended testsProduct warranty Log page entriesAbort ShippingPhysical/electrical specifications AC power requirementsDC power requirements General DC power requirement notesPower sequencing Conducted noise immunityCurrent profiles +5V +12VTypical ST373307FC drive +12V current profile Typical ST3146807FC drive +5V current profile Typical ST373307FC drive +5V current profile Power dissipation ST3146807FC ST373307FCTemperature Cheetah 10K.6 FC Product Manual, Rev. B ST336607FCRelative humidity Effective altitude sea levelShock and vibration ShockPackage size Packaged/product weight Drop height Recommended mounting Acoustics Air cleanlinessCheetah 10K.6 FC Product Manual, Rev. B Vibration Mechanical specifications Mounting configuration dimensionsDrive error recovery procedures Defect and error managementDrive internal defects/errors Read retry Maximum recovery time per Write retry FC-AL system errorsRead and write retry count maximum recovery times Maximum recovery time perLED connections InstallationDrive ID/option selection 1 J6 connector requirements Drive FrontDrive orientation CoolingDrive mounting Air flowGrounding FC-AL features Fibre Channel link service framesInterface requirements Fibre Channel task management functionsFibre Channel port login NPort login Plogi payload BytesFibre Channel Process Login Fibre Channel Process Login AcceptNPort Login Accept ACC payload Bytes Process Login Plri payloadFibre Channel fabric login Fabric Login Flogi payload BytesFabric Login Accept ACC payload Bytes Accept or NPort Login when sending frames to an initiatorFibre Channel Arbitrated Loop options Dual port supportFC-AL options supported Option SupportedSupported commands Command code Command name Supported commands Command code Supported Command nameRead descriptor mode Cheetah 10K.6 FC Product Manual, Rev. B Mode Sense data Cheetah 10K.6 FC Product Manual, Rev. B Inquiry dataCheetah 10K.6 FC inquiry data Bytes Data hexCheetah 10K.6 FC Product Manual, Rev. B DEF DEF CHG Cheetah 10K.6 FC Product Manual, Rev. B Miscellaneous operating features and conditions Miscellaneous featuresSupported Feature or condition Miscellaneous statusPhysical characteristics Physical descriptionConnector requirements Part description Positions Part number FeaturesFC-SCA pin descriptions Pin Signal name Signal typePin descriptions Power Fault LED OutFC-AL transmitters and receivers Active LED Out11 SEL6 through SEL0 ID lines Enable port bypass signalsMotor start controls Parallel Enclosure Services Interface ESI Arbitrated loop physical address Alpa values SettingSetting Hex Dec Signal characteristics TTL input characteristicsLED driver signals Device control codesTransmit eye diagram Differential Pecl inputEye diagram data values Link rate GHzSeagate Technology support services Online Services Automated ServicesPresales Support Technical SupportEuropean Support Services Customer Service CSOUSA/Canada/Latin America Support Services Call Center Toll-free Direct dial Africa/Middle East Support ServicesAsia/Pacific Support Services Cheetah 10K.6 FC Product Manual, Rev. B Index FC-AL Cheetah 10K.6 FC Product Manual, Rev. B Plogi Cheetah 10K.6 FC Product Manual, Rev. B Cheetah 10K.6 FC Product Manual, Rev. B
Related manuals
Manual 2 pages 5.2 Kb
Top Page Image Contents