The disks are what generates the heat, right? What about admin failing and removing the disks.

From: toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of tmac
Sent: Wednesday, April 01, 2015 12:19 PM
To: Blackmor, Chris
Cc: Toasters
Subject: Re: Turn off disk tray?

Sorry, I meant what I did was not supported...I was on 8.1...definitely not supported.

There was logic put in to allow for the shelf removal as the docs indicate.

Some of that logic also allows the shelf to be reattached....doing so in prior releases can really mess things up

which requires a reboot to resolve.

--tmac

Tim McCarthy

Principal Consultant

On Wed, Apr 1, 2015 at 12:15 PM, Blackmor, Chris <chris.blackmor@amd.com> wrote:

Note that the first document states:

Support for shelf hot-remove

Data ONTAP 8.2.1 and later 8.2.x releases support the hot removal of disk shelves—the physical removal of disk shelves that have had the data evacuated—in multipath HA or single-controller-dual-path (multipath) storage systems that are currently up and serving data. You can hot remove one or more SAS or FC disk shelves from anywhere within a stack or loop of disk shelves, or an entire stack or loop of disk shelves.

Which is why I stated that it depends on the OS and configuration.
C-

On 04/01/15 11:10, tmac wrote:

*THIS IS NOT SUPPORTED*
I have in the past removed shelves from 7-mode and cDOT systems
There was no intent to put them back on the same controller.
I had no issues, but that does not mean you won't.
As removing shelves from a 7-mode system generally result in the possibility of an unstable system, it is a good idea to reboot shortly after.
Or better yet, schedule a reboot and remove the shelves at that time.

A Shelf of disks that are not active does not generate very much heat. Only when they are active will the BTUs increase.

--tmac

*Tim McCarthy*
/Principal Consultant/

On Wed, Apr 1, 2015 at 12:01 PM, Blackmor, Chris <chris.blackmor@amd.com <mailto:chris.blackmor@amd.com>> wrote:

David,
Depending on the configuration and OS you can hot remove shelves:

https://library.netapp.com/__ecmdocs/ECMP12365050/html/__GUID-8DAA87F5-106C-448A-A27C-__2869A5E7A175.html <https://library.netapp.com/ecmdocs/ECMP12365050/html/GUID-8DAA87F5-106C-448A-A27C-2869A5E7A175.html>
https://library.netapp.com/__ecmdocs/ECMP1610209/html/GUID-__2B80FBD2-007D-4D19-8EB1-__9CCEED211001.html <https://library.netapp.com/ecmdocs/ECMP1610209/html/GUID-2B80FBD2-007D-4D19-8EB1-9CCEED211001.html>

Good luck.
C-

On 04/01/15 10:52, Knight, David wrote:

Hi,
We are migrating all data from an old fas2040 to a newer netapp
in a different location. The fas2040 has several DS14 shelves, and one ds4243 shelf.

I wonder if I can just turn off disk shelves as the data is migrated?
Normally I'd just let the disks spin till I had everything safely moved, and
the disk sanitized. But we lost AC in this room, and warm weather approaches.
Can I simply unshare, and unmount all volumes on a disk tray, then turn
the tray off to reduce heat generation?
(later once I know all the data is safe, and snapshots have caught up
on the new system, I'd like to turn the shelf back on, delete the aggregates,
and sanitize the disks)

Will this work? Or will the 2040 be very unhappy if a shelf is turned off?

Thanks for your help
David

David Knight
Department of Atmospheric and Environmental Sciences Tel: (518)-442-4204 <tel:%28518%29-442-4204>
University at Albany ES-228 Fax: (518)-442-4494 <tel:%28518%29-442-4494>
Albany, NY 12222 Email: dknight@albany.edu <mailto:dknight@albany.edu>

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