HP3000-L Archives

December 2003, Week 3

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Subject:
Re: HAFO thread
From:
Raymond Familar <[log in to unmask]>
Reply To:
Raymond Familar <[log in to unmask]>
Date:
Fri, 19 Dec 2003 17:12:33 -0500
Content-Type:
text/plain
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text/plain (71 lines) 
Joseph,

I just got this working earlier this week.  I am running a N4000-200-380
with dual fiber connections via a FC switch to a VA 7110.  I'll be setting
up its sister system after Christmas.  Let me know if you need details.

Ray Familar



On Fri, 5 Dec 2003 12:49:31 -0500, Joseph Dolliver
<[log in to unmask]> wrote:

>Has anyone been successful in installing HAFO with a VA on the HP3000
>N-Class?
>
>
>-----Original Message-----
>From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On
>Behalf Of Goetz Neumann
>Sent: Friday, December 05, 2003 4:34 AM
>To: [log in to unmask]
>Subject: Re: [HP3000-L] Model 20 Array - Mirror or Raid?
>
>
> Bob J. wrote:
>
>> Simpkins, Terry wrote:
>>
>>>If we "split the bus" on the array mechanism into two separate groups of
>drives, and
>>>then connect a separate controller to the other half of the bus.  You
>can't have the
>>>hardware mirrored drive on the other controller, (I'm told you can do
this
>on UX).
>>>It must be on the same path as the "master" drive because MPE sees them
as
>a single
>>>device.
>>
>>
>> That isn't exactly accurate. Actually ALL of the drives are accessible
>> from EITHER controller but of course via different addresses. Your
>> installer should set the DEFAULT ownership of drives to each controller.
>> To improve throughput each controller should share the load. Only one
>> controller is necessary to address ALL of the drives.......but....where
>> MPE falls short is not having a mechanism for auto fallover of a failing
>> controller.
>
>Just a few words of (non-thursday riddle, humour, commandments or
>enlightenment) facts :
>
>1) Mirrored Disk/iX does NOT work with the MPEXL_SYSTEM_VOLUME_SET.
>
>2) There *is* a mechanism in MPE for 'fallover' it is called HAFO -
>    High Availability FailOver.  Unfortunately for the OP (original
>    poster) it is only supported with XP and VA arrays and NOT on
>    Nike's or Autoraid's (because it does not work with those).
>
>Goetz.
>
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