Seagate ST9900805SS Savvio 10K.1 FC Product Manual - Page 45

Savvio FC Product Manual, Rev. D

39

7.0

Defect and error management

The drive, as delivered, complies with this product manual. The read error rates and specified storage capaci-

ties are not dependent upon use of defect management routines by the host (initiator).

Defect and error management in the SCSI protocol involves the drive internal defect/error management and

FC-AL system error considerations (errors in communications between the initiator and the drive). Tools for

use in designing a defect/error management plan are briefly outlined in this section. References to other sec-

tions are provided when necessary.

7.1

Drive internal defects/errors

During the initial drive format operation at the factory, media defects are identified, tagged as being unusable,

and their locations recorded on the drive primary defects list (referred to as the “P’ list and also as the ETF

defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place

on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory

formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment

are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the

Read Defect Data command.

Details of the SCSI commands supported by the drive are described in the

Fibre Channel Interface Manual

.

Also, more information on the drive Error Recovery philosophy is presented in the

Fibre Channel Interface

Manual

.

7.2

Drive error recovery procedures

When an error occurs during drive operation, the drive, if programmed to do so, performs error recovery proce-

dures to attempt to recover the data. The error recovery procedures used depend on the options previously set

in the Error Recovery Parameters mode page. Error recovery and defect management may involve using sev-

eral SCSI commands described in the

Fibre Channel Interface Manual

. The drive implements selectable error

recovery time limits required in video applications.

The error recovery scheme supported by the drive provides a way to control the total error recovery time for the

entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent in

error recovery for a command can be limited using the Recovery Time Limit bytes in the Error Recovery mode

page. The total amount of time spent in error recovery for a single LBA can be limited using the Read Retry

Count or Write Retry Count bytes in the Error Recovery mode page.

The drive firmware error recovery algorithms consists of 11 levels for read recoveries and five levels for write.

Each level may consist of multiple steps, where a step is defined as a recovery function involving a single re-

read or re-write attempt. The maximum level used by the drive in LBA recovery is determined by the read and

write retry counts.

Section	Page
1.0 Scope	7
2.0 Applicable standards and reference documentation	9
2.1 Standards	9
2.1.1 Electromagnetic compatibility	9
2.1.1.1 Electromagnetic susceptibility	9
2.1.2 Electromagnetic compliance	10
2.2 Reference documents	11
3.0 General description	13
3.1 Standard features	13
3.2 Media description	14
3.3 Performance	14
3.4 Reliability	15
3.5 Formatted capacities	15
3.5.1 Programmable drive capacity	15
3.6 Factory-installed accessories	16
3.7 Factory-installed options	16
3.8 User-installed accessories	16
4.0 Performance characteristics	17
4.1 Internal drive characteristics	17
4.2 Seek performance characteristics	17
4.2.1 Access time	17
4.2.2 Format command execution time for ³ 512-byte sectors (minutes)	18
4.2.3 General performance characteristics	18
4.3 Start/stop time	18
4.4 Prefetch/multi-segmented cache control	19
4.5 Cache operation	19
4.5.1 Caching write data	20
4.5.2 Prefetch operation	20
4.5.3 Optimizing cache performance for desktop and server applications	21
5.0 Reliability specifications	23
5.1 Error rates	23
5.1.1 Recoverable Errors	23
5.1.2 Unrecoverable Errors	23
5.1.3 Seek errors	24
5.1.4 Interface errors	24
5.2 Reliability and service	24
5.2.1 Mean time between failures (MTBF)	24
5.2.2 Preventive maintenance	24
5.2.3 Hot plugging the drive	24
5.2.4 S.M.A.R.T.	25
5.2.5 Thermal monitor	26
5.2.6 Drive Self Test (DST)	27
5.2.6.1 DST failure definition	27
5.2.6.2 Implementation	28
5.2.6.2.1 State of the drive prior to testing	28
5.2.6.2.2 Invoking DST	28
5.2.6.2.3 Short and extended tests	28
5.2.6.2.4 Log page entries	29
5.2.6.2.5 Abort	29
5.2.7 Product warranty	29
6.0 Physical/electrical specifications	31
6.1 AC power requirements	31
6.2 DC power requirements	31
6.2.1 Conducted noise immunity	33
6.2.2 Power sequencing	33
6.2.3 Current profiles	33
6.3 Power dissipation	36
6.4 Environmental limits	38
6.4.1 Temperature	38
6.4.2 Relative humidity	38
6.4.3 Effective altitude (sea level)	38
6.4.4 Shock and vibration	39
6.4.4.1 Shock	39
6.4.4.2 Vibration	41
6.4.5 Air cleanliness	41
6.4.6 Corrosive environment	41
6.4.7 Acoustics	42
6.4.8 Electromagnetic susceptibility	42
6.5 Mechanical specifications	43
7.0 Defect and error management	45
7.1 Drive internal defects/errors	45
7.2 Drive error recovery procedures	45
7.3 FC-AL system errors	46
8.0 Installation	47
8.1 Drive orientation	47
8.2 Cooling	47
8.3 Drive mounting	48
8.4 Grounding	48
9.0 Interface requirements	49
9.1 FC-AL features	49
9.1.1 Fibre Channel link service frames	49
9.1.2 Fibre Channel task management functions	50
9.1.3 Fibre Channel task management responses	50
9.1.4 Fibre Channel port login	51
9.1.5 Fibre Channel port login accept	52
9.1.6 Fibre Channel Process Login	52
9.1.7 Fibre Channel Process Login Accept	53
9.1.8 Fibre Channel fabric login	53
9.1.9 Fibre Channel fabric accept login	54
9.1.10 Fibre Channel Arbitrated Loop options	55
9.2 Dual port support	55
9.3 SCSI commands supported	56
9.3.1 Inquiry data	61
9.3.2 Mode Sense data	61
9.4 Miscellaneous operating features and conditions	65
9.5 FC-AL physical interface	66
9.5.1 Physical characteristics	66
9.5.1.1 Physical description	66
9.5.2 Connector requirements	67
9.5.3 Electrical description	67
9.5.4 Pin descriptions	68
9.5.5 FC-AL transmitters and receivers	69
9.5.6 Power	69
9.5.7 Fault LED Out	69
9.5.8 Active LED Out	70
9.5.9 Enable port bypass signals	70
9.5.10 Motor start controls	70
9.5.11 SEL_6 through SEL_0 ID lines	71
9.5.11.1 Parallel Enclosure Services Interface (ESI)	71
9.5.12 Device control codes	73
9.6 Signal characteristics	73
9.6.1 TTL input characteristics	73
9.6.2 Differential PECL output	74
9.6.3 Differential PECL input	74

Seagate ST9900805SS Savvio 10K.1 FC Product Manual - Page 45

Defect and error management

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