[Info-vax] Kittson question

[Stephen Hoffman]

On 2015-01-08 11:29:23 +0000, abrsvc said:

> 
>> controller-based, also known as phase I shadowing. Starting with OpenVMS
> 
> This statement says it all.  Phase 1 has not been discontinued, it just 
> is not referenced as phase 1 anymore.  Controller based shadowning is 
> available on any SAN storage although usually different RAID levels are 
> used instead of just shadowing.  Shadowing is RAID level 1 after all.

Yes, HBVS phase I and phase II are RAID-1.
But Shadowing Phase I has been retired.
Shadowing Phase I is similar to controller-based RAID, but it involved 
the host system in the processing, and could involve multiple HSC 
controllers.
Please see my "Re: HBVS" reply for additional details.

ps: donno where the double post came from.   Sorry about that.


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