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Message Posted: Fri, 09 Nov 2001 @ 07:51:52 GMT

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Subj:   Re: Rehash on a restore
From:   Ysbrand Bergman

Hi Ruth,

Re-hashing only takes place if there is a difference in the number of amps between the 2 systems. I assume that you have the same number of amps on both the development and production system. The actual rehash time (if necessary) depends on the speed of the target system as well as the disk subsystem

It is pretty hard to give a good estimate how long a restore will take. If you have a slow tape drive it is likely that restores take about the same time as backups on 52xx systems. On the other hand if your tape subsystem is pushing your system already to the limits during backups it is very likely that you restores will take at least twice as long.

On the Target system the secondary indexes need to be rebuild as well, depending on the complexity and number this might add quite some time.

In short.. It will be very hard to predict without knowing anything about source system, target system and tape subsystem.


Ysbrand Bergman
Support Specialist
NCR Worldwide Customer Services

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