top
logo

Feeds


TEM - LTO PDF Print
Tuesday, 21 February 2006 16:20

LTOThe Ultrium tape format is the implementation of the LTO (Linear Tape-Open) Technology that is optimized for high capacity and performance with exceptional reliability in either a stand-alone or an automated environment. It uses a single reel cartridge to maximize capacity. Ideally suited for backup, restore, and archive applications, the Ultrium tape format will establish a new benchmark for large volume backup and archive. Ultrium products will meet the needs of the enterprise through single-server user on a roadmap, or migration path, that extends well into the next decade.

  • Approximate cartridge dimensions: 4.1 x 4.0 x 0.8 in. (105 x 102 x 21 mm) (smaller than most existing single-reel tape cartridges)
  • The single-hub design allows for the cartridge to be optimally packed with media. High capacity is further enhanced by the use of an LTO Technology data compression algorithm with two control modes to maximize compression efficiency
  • The tape provides storage space for 384 data tracks, divided into four regions (data bands). Each data band is bounded on top and bottom by a band of servo information. Each data band can contain up to 96 tracks. Data bands are filled one-at-a-time
  • LTO-CM is a noncontacting passive RF interface embedded in the cartridge which allows remote reading of the contents of the built-in 4KB (32 Kbits) of non-volatile memory. Calibration information, manufacturers' data, and information about initialization may be retrieved without having to insert the tape cartridge into a drive
  • Dedicated Dual Servo: The servo bands are pre-written on the tape during the tape cartridge manufacture process. If one servo element becomes defective, or if a portion of the servo code on the tape becomes corrupt, the head will continue to track as a result of the second "redundant" servo system

 

LTO TEM graph

 

LTO tape errors in Tapewise

The LTO errors stats are derived from the Log Sense page $30, the actual parameter used is shown in brackets. All CM- errors are previous errors on the tape that are recorded on the CM chip and should be used for reference only. At present all three LTO drives (Seagate, IBM and HP) support these pages, however the Seagate drive does have a lot of other information also available to us (currently not displayed). This reported data has been gathered from the SCSI reference and ECMA-319 document.

Write errors

(3) Rewrites: This field shall specify the total number of Write Errors (a failure to finish writing a Data Set due to excessive RWW retries), where a

Subsequent attempt to write the Data Set succeeded.

(4) Unrecovered: This field shall specify the total number of Write Errors that resulted in a backup being terminated.

(5) Suspend write: This field shall specify the total number of Servo Tracking Errors that resulted in a Write being suspended, and the Data Set being written further down the tape.
(6) Fatal suspend: This field shall specify the total number of Servo Tracking Errors that resulted in a Write failure. In other words, the drive was unable to write the suspended Data Set further down the tape.


CM-Rewrites, CM-Unrecovered, CM-Suspend, CM_Fatal Suspend are the values when the tape was loaded/start of the task

Read Errors

(8) Rereads: This field shall specify the total number of Data Sets that were not successfully read on the first attempt, but which were successfully read subsequently.

(9) Unrecovered: This field shall specify the total number of Data Sets that were not successfully read on the first, nor on a subsequent attempt to read it.


CM-Rereads, CM-Unrecovered are the values when the tape was loaded/start of the task

 

 

Non-recoverable error rate < 1 in 1017 bits

Error recovery and control • Error correction code techniques (C1 and C2 ECC)

• Read-after-write (RAW)

• Error monitoring and reporting (error log)

• Retry on

Mean time between failures

(MTBF)

250,000 hours MTBF at 100% duty cycle: power

applied and tape moving continuously

(Desktop drive; 50,000 hours at full load and 25°C)

Cartridge load/unload 300,000 cartridge load/unload cycles (no thread)

Mean time to replace (MTTR) Less than 30 minutes

 



 

 

  Tracks Channels Full lenght passes
LTO gen 1 384 12 48
LTO gen 2 512 16 64
LTO gen 3 704 16 56
Specification Description
 

bottom
top
3480.png

bottom

Powered by Joomla!. Designed by: Free Joomla 1.5 Theme, hosting. Valid XHTML and CSS.