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Document ID: GSMH-3DHMKM |
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IBM PS/2 - Difference or increase in tape backup time
Applicable to: World-Wide
Symptom:
Users may notice a significant difference in tape backup time between apparently similar systems for the same amount of data.Or,a significant increase in tape backup time if a system board is replaced.
Problem Isolation Aids:
None
Fix:
Add the parameter IROPT=I to the device driver statement in CONFIG.SYS.
FIX(1) For PMTAPE
DEVICE=C: PMTAPE IP2IDRV.SYS IROPT=I
FIX(2) For OS2TAPE
Same as above,but system must have latest version of OS/2TAPE (currently 1.01). The driver to modify is ITI.SYS
Note:
The parameter must be upper case.
Adding the above option in the device driver forces the device driver to a very high priority when it is expecting an index pulse.The device polls a status bit instead of waiting for an interupt to occur, hence saving the interrupt latency which can be long.This allows the phase lock loop to sync. more quickly which helps a sensitivity problem that some model 80's may have.
SAS KEYWORDS:
PSY2 D/T8580 8580DSKT 8580SYSTAPE
PSY2TAPE PSY2MISC 8580SYSMISC
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Search Keywords |
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Hint Category |
Retain, Tape Drives | |
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Date Created |
24-08-94 | |
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Last Updated |
24-11-98 | |
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Revision Date |
23-11-99 | |
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Brand |
IBM PC | |
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Product Family |
PS/2 | |
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Machine Type |
8580 | |
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Model |
various | |
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TypeModel |
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Retain Tip (if applicable) |
H124885 | |
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Reverse Doclinks |