28G2 - Sony - Vendor Tutorial [Compatibility Mode]

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Media Reliability TestFujitsu Siemens Computers Preferred Quality of LTO TapesDr. Hans Günter Festl Paderborn, October 2008„„„„Why „Medidia RReliability Test“t“ (MRT)?(MRT)?Ensure the mostmost reliablereliable mmediaedia fforor allall FFujitsuujitsu Siemens Computers customers Reproduce customer head / media difficulties in our labOngoing quality tests of Fujitsu Siemens Computers released cartridges to prove high quality2Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reservedLTO (Li(Linear TTape Open) generations todayLTO Ultrium 1 LTO Ultrium 2 LTO Ultrium 3 LTO Ultrium 4Capacity(GB) uncompressed 100 200 400 800Tracks 384 512 704 896Tape length (m) 609 609 680 820CompatibilityLTO-1 LTO-2RRdead LTO-1LTO-1 LTO-2 LTO-3Two generations backward LTO-2LTO-3 LTO-4Write LTO-1 LTO-2 LTO-3LTO-1One ggeneration backward LTO-2 LTO-3 LTO-43Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reservedLTO TTape Layout (allll generatitions)4Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reservedSdServo and DData Trackks, Human Hair5Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved†„†„„„„†††Meddiia Vendor Compatibility // ReliabilityAll LTO drives are compatible to the media from all vendorsMMdediia durattiion ...

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• Publié par: Thyam
• Nombre de lectures: 19
• Langue: English

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Media Reliability Test

Fujitsu Siemens Computers Preferred Quality of LTO Tapes

Dr. Hans Günter Festl Paderborn, October 2008

2

y „ e a e a

    customers

y es

    

 

 

„ Reproduce customer head / media difficulties in our lab

 

„ Ongoing quality tests of Fujitsu Siemens Computers released cartridges to prove high quality

Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved

3

 near ape pen genera ons o ay

Capacity (GB) uncompressed Tracks Tape length (m)

Compatibility ea Two generations backward Write One eneration backward

LTO Ultrium 1 LTO Ultrium 2 LTO Ultrium 3 100 200 400 384 512 704 609 609 680

LTO-1 LTO-1

- LTO-2 LTO-1 LTO-2

Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved

- LTO-2 LTO-3 LTO-2 LTO-3

LTO Ultrium 4 800 896 820

- LTO-3 LTO-4 LTO-3 LTO-4

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genera

ons

Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved

5

ervo an

 

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Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved

6

e a en or ompa

y e a y

„ All LTO drives are compatible to the media from all vendors

e a ura on epen s on e.g. † Environment: Dust, temperature, humidity † Type of usage: Number of usage, time of exchanges, full tape writing  , † Cartridge handling: „Dropping“

„ Most critical regions are the tape edges (region of outer Servo Bands)

„ MRT mainly shows the differences in terms of the „edge duration“

Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved

7

ape nconven ences

„ Almost all reported tape inconveniences occur during writing

a a oss ue o rea ncons s enc es are „neary un nown

„ All the following technical difficulties are reported as „Cannot Write Medium“ † Host Bus Ada ter -, cable -, switch - failures † Ignore drive cleaning requests † Drive hardware problems † Uncorrectable errors on the tape

„ Extensive write problems may cause no actual valid backup † Running out of backup time window due to retries     

„ The customer loses the trust to his tape backup

Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved

8

es qu pemen

„ 15 LTO-4 Drives, IBM Full Height, HP Half Height

 u su emens ompu ers r mergy ervers

„ Different interfaces: SAS, FibreChannel, SCSI

 

  

 

 

 

 

Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved

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e a e a

y es

 roce ure or

„ 4 x 800 GB write and read (complete tape)

„ write a filemark at 700 GB to the tape

„ 110 x write the last 100 GB to the tape (only at the edge)

„ x wr e an rea comp e e ape

„ Reading the error logs continously

Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved

-

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ogge rrors ur ng ea ng r ng

„ Read Retries

† Lead to loss of performance

„ Write Retries          - - † Lead to loss of performance and capacity

 apes

 

„ Suspended Writes † Tape drive writes the data again due to loss of servo Information † Lead to loss of performance

  

 

       

Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved

 

MRT Results for LTO-4 cartridges / Average per vendor

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WriteRetries

ReadRetries

SuspendedWrites

Media Reliability Test Dr. Hans Günter Festl © Fujitsu Siemens Computers 2008 All rights reserved