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TEM - 3590 PDF Print

3590The IBM TotalStorage 3590 Tape Drive provides high levels of performance and reliability and exemplifies IBM's continued leadership in storage products. Since its first shipment in September 1995, it has met with wide marketplace acceptance. Over 100,000 3590 Tape Drives are installed in both IBM and non-IBM systems across industry sectors.

3590/3590e media
  • Every cartridge full length certified
  • Short length durability 120,000 passes
  • Long length durability 400 passes
  • Permanent System errors 0 (zero)
  • Maximum Transient ERP’s 5
  • Maximum Servo Transient errors 0 (zero)
  • Native Capacities:
    • 128 track “B” drives 20GB
    • 256 track “E” drives 40GB
    • 384 track “H” drives 60GB

 


 

3590 TEM Chart

 

Serpentine Interleaved Track Sets

The 18 tracks recorded on IBM 3480 media were used to record ECC information along with the data. The original base IBM 3490 models also used the same 18-track format but were later enhanced in the IBM 3490E models, which implemented two sets of 18 tracks. In an IBM 3490E device the first 18 tracks are recorded when the tape moves in a forward direction until the physical end of

the tape is reached. Then, using an electronic head switch (that is, not physically moving the head itself in any direction but switching to a second set of read-write heads), a second set of 18 tracks is recorded when the tape moves in a backward direction until the physical beginning of the tape is reached. In the IBM 3590 a second generation of thin film magneto resistive (MR) heads is used, which, together with the new tape medium, allows recording with much higher area density, both in number of bits as well as number of tracks per inch.

Data is written in blocks of 384KB of user data using a 16-track format (data and ECC information are recorded differently compared to the 18-track format). The first set of 16 tracks is written to the physical end of the tape, and then, using the electronic head switch, 16 different interleaved tracks are written while the tape moves back to the beginning. The head is then indexed (physically moved a

fraction of a millimeter) to the next set of 16 tracks. In this way eight sets of interleaved tracks are written to a total of 128 tracks.

Servo tracks are used to ensure accurate reading and writing of the data. The servo tracks on each IBM 3590 tape cartridge are written at the time of manufacture.

 

3590 Write Errors

· Data errors:

· Corrected - Blocks Corrected/ECC is done "on the fly" by hardware. Each count represents one block in error that was successfully corrected and written. When multiple errors occur on a block, the counter that is updated is based on the first error detected.

· Trans ERPRDF/ECC Transient Conditions. ERP action was required because of a RDF (Read Data Flow) or ECC detected error and the first retry was successfully in place. Each count represents one block in error that was successfully recovered and written. When multiple errors occur on a block, the counter that is updated is based on the first error detected.

· RDF/CCQRDF Data Acquisition Errors. During read-back check, the Read Data Flow (RDF) failed to acquire an IBG or block at the beginning of a write append sequence and no servo error was reported, ERP action was required, and RDF/ECC transient condition criteria were not met. Each count represents one block in error that was successfully recovered and written. When multiple errors occur on a block, the counter that is updated is based on the first error detected.

· ECCECC Data Errors. An uncorrectable error, CRC error, instantaneous speed variation (ISV) error, or no ending burst error occurred during read back check of a block, and no servo error was reported; ERP action was required, and RDF/ECC transient condition criteria were not met. Each count represents one block in error that was successfully recovered and written. When multiple errors occur on a block, the counter that is updated is based on the first error detected.

· ERPTotal Write Retries. The count of the total number of ERP actions. Each count represents one occurrence, not just one time per block. Counts may include occurrences from both temporary and permanent errors.

· VCRVCR Write Errors. The count of write errors in the Volume Control Region. Each count represents one occurrence, not just one time per block. Counts may include occurrences from both temporary and permanent errors.

· LiftedBlocks Lifted. The total number of times the device had to lift and move a block. Each count represents one occurrence, not just one time per block. Counts may include occurrences from both temporary and permanent errors.

· Servo

· TranServo Transient Condition. ERP action was required because of a servo detected error and the first retry was successfully in place. Each count represents one block in error that was successfully recovered and written. When multiple errors occur on a block, the counter that is updated is based on the first error detected.

· ACQServo Data Acquisition Errors. A servo error (servo dropout or off-track shutdown) was detected while trying to acquire an IBG or block at the beginning of a write append sequence; ERP action was required, and servo transient condition criteria were not met. Each count represents one block in error that was successfully recovered and written. When multiple errors occur on a block, the counter that is updated is based on the first error detected.

· ERPServo Data Errors. A servo error (servo dropout or off-track shutdown) was detected while writing data, ERP action was required, and servo transient condition criteria were not met. Each count represents one block in error that was successfully recovered and written. When multiple errors occur on a block, the counter that is updated is based on the first error detected.

· Demark -Servo Demark Blocks Written. The count of servo demark blocks written. Multiple occurrences per block are not recorded. Counts may include occurrences from both temporary and permanent errors.

 

 

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