[cisco-voip] Can you use the same instructions

[Wes Sisk]

Candace,

The data you received from HP was actually based on the CallManager pre 3.3
to post 3.3 upgrade installation instructions - i.e. when an OS re-install
was required.  Thus far they have not offered a solid reason not to pull
drives for other upgrades.

/Wes

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net]On Behalf Of Candace Holman
Sent: Wednesday, August 03, 2005 12:02 PM
To: Mike Armstrong
Cc: cisco-voip at puck.nether.net; BillS at tns.its.psu.edu
Subject: Re: [cisco-voip] Can you use the same instructions


Be extremely careful about following the instructions in the upgrade
documents, whether you are for or against them.  I can testify from
experience and an extremely long weekend of continued failures, that not
all of them correspond with what HP recommends.  HP recommends that you
never do an upgrade without all the drives in place.

Would love to hear from an expert on this matter.

Candace

Mike Armstrong wrote:

>I think the issue is not whether or not you can hot-swap a drive and have
>the array continue to function, but what the state of the swapped-out drive
>is.  Using the "pull a drive" backup procedure recommended in CCM
>maintenance docs, you want the pulled drive to be in a stable state
>representing the system prior to maintenance, so you can fall back if need
>be.  Pulling the drive while it's "hot" offers no assurance of that.
>
>Unity docs explicitly forbid pulling a drive in this fashion, but I've
never
>understood why, and have so-far-successfully ignored the warnings.
>
>Finally, I never rebuild the array until my maintenance is complete -- the
>maintenance window is shortened considerably, since there's no delay to
>rebuild, and the maintenance itself is noticeably faster.
>
>Mike Armstrong
>UF/IFAS CREC
>Lake Alfred, FL
>
>
>
>>Date: Tue, 2 Aug 2005 22:47:06 -0400
>>From: "Simon, Bill" <BillS at tns.its.psu.edu>
>>Subject: RE: [cisco-voip] Can you use the same instructions
>>To: "'Lelio Fulgenzi '" <lelio at uoguelph.ca>,
>>"'cisco-voip at puck.nether.net '" <cisco-voip at puck.nether.net>
>>Message-ID:
>><07A14D6987A5F647B2415D72EDF63B56F78741 at tnsex01.otc.win.psu.edu>
>>Content-Type: text/plain; charset="iso-8859-1"
>>
>>The RAID controllers are hot-plug ... you can pull a drive while the
>>machine
>>is up and replace it with another one and it will start mirroring from the
>>live, working drive.
>>
>>We have always done this using the "top" drive on HP servers (drive 1
>>versus
>>drive 0) so I am not sure if this is the only drive that can be hot
>>swapped
>>or if you can do so with either drive.  I think it used to be only this
>>one,
>>but maybe the RAID controllers allow either way now.
>>
>>
>>
>
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>


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