Voice over IP Cisco - Can you use the same instructions

Author

Can you use the same instructions

Voll, Scott

2005-08-02, 5:45 pm

Can I use the same instructions to remove a drive and replace on my
Unity 7835 as I do on my CM 7835?

TIA

Scott

Lelio Fulgenzi

2005-08-03, 2:45 am

I believe the drive replacement activity is hardware/RAID controller based rather than application based. Our drive replacement activities are the same on our HP servers (Callmanager) as they are on our IBM servers (Unity).
a.. shut down server
b.. unplug drive
c.. start up server
d.. press the appropriate key to 'fail' the drive, but not change the configuration (HP=F2, IBM=F5)
e.. after server has booted up, insert spare drive
f.. confirm drive has been mirrored using appropriate utility

----- -----
Lelio Fulgenzi, B.A. lelio@uoguelph.ca.eh
Network Analyst (CCS)
University of Guelph FAX

519) 767-1060 JNHN
Guelph, Ontario N1G 2W1 TEL

Simon, Bill

2005-08-03, 2:45 am

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.

-----Original Message-----
From: Lelio Fulgenzi
To: cisco-voip@puck.nether.net
Sent: 8/2/2005 10:28 PM
Subject: Re: [cisco-voip] Can you use the same instructions

I believe the drive replacement activity is hardware/RAID controller
based rather than application based. Our drive replacement activities
are the same on our HP servers (Callmanager) as they are on our IBM
servers (Unity).

* shut down server
* unplug drive
* start up server
* press the appropriate key to 'fail' the drive, but not change
the configuration (HP=F2, IBM=F5)
* after server has booted up, insert spare drive
* confirm drive has been mirrored using appropriate utility

-----
-----
Lelio Fulgenzi, B.A.
lelio@uoguelph.ca.eh <mailto:lelio@uoguelph.ca.eh>
Network Analyst (CCS)
University of Guelph FAX

519) 767-1060 JNHN
Guelph, Ontario N1G 2W1 TEL

Lelio Fulgenzi

2005-08-03, 2:45 am

we've been told there's a fundamental difference between hot pluggable and hot swappable. The servers support hot pluggable which we're told means you can plug in a drive at any time....but not unplug it. We've got this from HP support, TAC, and many cisco employees.

Although the HP servers support the hot plug in a repetative drive mirroring regiment - the IBM servers (7855) do not. I believe their MTBF count for the insertions of those drive systems is much much lower than you would expect.
----- -----
Lelio Fulgenzi, B.A. lelio@uoguelph.ca.eh
Network Analyst (CCS)
University of Guelph FAX

519) 767-1060 JNHN
Guelph, Ontario N1G 2W1 TEL

519) 824-4120 x56354
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
mob lawyer: your people insulted my brother.
dr. house: what? romano in the parmesan cheese shaker again?
----- Original Message -----
From: Simon, Bill
To: 'Lelio Fulgenzi ' ; 'cisco-voip@puck.nether.net '
Sent: Tuesday, August 02, 2005 10:47 PM
Subject: RE: [cisco-voip] Can you use the same instructions

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.

-----Original Message-----
From: Lelio Fulgenzi
To: cisco-voip@puck.nether.net
Sent: 8/2/2005 10:28 PM
Subject: Re: [cisco-voip] Can you use the same instructions

I believe the drive replacement activity is hardware/RAID controller
based rather than application based. Our drive replacement activities
are the same on our HP servers (Callmanager) as they are on our IBM
servers (Unity).

* shut down server
* unplug drive
* start up server
* press the appropriate key to 'fail' the drive, but not change
the configuration (HP=F2, IBM=F5)
* after server has booted up, insert spare drive
* confirm drive has been mirrored using appropriate utility

-----
-----
Lelio Fulgenzi, B.A.
lelio@uoguelph.ca.eh <mailto:lelio@uoguelph.ca.eh>
Network Analyst (CCS)
University of Guelph FAX

519) 767-1060 JNHN
Guelph, Ontario N1G 2W1 TEL

Mike Armstrong

2005-08-03, 7:45 am

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@tns.its.psu.edu>
> Subject: RE: [cisco-voip] Can you use the same instructions
> To: "'Lelio Fulgenzi '" <lelio@uoguelph.ca>,
> "'cisco-voip@puck.nether.net '" <cisco-voip@puck.nether.net>
> Message-ID:
> < 07A14D6987A5F647B2415D72EDF63B56F78741@t
nsex01.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.
>

Candace Holman

2005-08-03, 5:45 pm

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
>
>
>
>
> ________________________________________
_______
>cisco-voip mailing list
>cisco-voip@puck.nether.net
>https://puck.nether.net/mailman/listinfo/cisco-voip
>
>

Wes Sisk

2005-08-03, 5:45 pm

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@puck.nether.net
[mailto:cisco-voip-bounces@puck.nether.net]On Behalf Of Candace Holman
Sent: Wednesday, August 03, 2005 12:02 PM
To: Mike Armstrong
Cc: cisco-voip@puck.nether.net; BillS@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
>
>
>
>
> ________________________________________
_______
>cisco-voip mailing list
>cisco-voip@puck.nether.net
>https://puck.nether.net/mailman/listinfo/cisco-voip
>
>

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