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List:       toasters
Subject:    RE: How to resolve LUN misalignment?
From:       "Steiner, Jeffrey" <Jeffrey.Steiner () netapp ! com>
Date:       2018-06-25 12:18:58
Message-ID: CY4PR06MB2328E574A7B4E23C3151D543964A0 () CY4PR06MB2328 ! namprd06 ! prod ! outlook ! com
[Download RAW message or body]

Are you sure it's genuinely misaligned? 

Database logging operations almost always set off the misaligned warnings in ONTAP. \
The only way to be sure is to get the perfstat or just "stats lun" output. There's a \
quick guide on how to get this data in Appendix B of TR-3633. If you get the "stats \
start" and "stats stop" data from a time when the database is reasonably active, \
you'll know whether this is true misalignment or just the usual harmless logging \
activity.

-----Original Message-----
From: toasters-bounces@teaparty.net <toasters-bounces@teaparty.net> On Behalf Of \
                Chris Hague
Sent: Monday, June 25, 2018 3:59 AM
To: John Stoffel <john@stoffel.org>
Cc: toasters@teaparty.net
Subject: RE: How to resolve LUN misalignment?

Hi John,

Agreed about the signature, nothing I can do about that though!!

It is a SQL LUN which was 7MTT across, it is 12TB in size, about 5TB used.

I know there used to be a way to easily fix this in 7 mode, but cannot find anything \
on CDOT

-----Original Message-----
From: John Stoffel <john@stoffel.org> 
Sent: 09 June 2018 15:38
To: Chris Hague <Chris_Hague@ajg.com>
Cc: toasters@teaparty.net
Subject: Re: How to resolve LUN misalignment?


Chris> Showing Alignment: misaligned on a large LUN which has been 7MTT migrated.

How are you seeing this mis-alignment?  What are the numbers?  How big is the lun?  \
What OS is using the LUN?  Looking at the docs, VMware is almost impossible to aligh \
correctly.  There are other issues with Linux and Solairs, but if you have LVM in \
place between the LUN and the filesystem(s), maybe you can build a new aligned LUN \
and migrate the data that way?  

Chris> Looking for a procedure for ONTAP 9.1, all articles seem to be for 7-Mode.


Chris> Can anyone in this group offer any advice?

Sure, trim your darn corporate silly ass message trailer, it was something like 10x \
longer than your message!  I know, it's not upto you, but dang it's stupidly long.  \
And stupidly not appropriate.

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This email is being sent by a subsidiary of Arthur J. Gallagher Holdings (UK) \
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status of our subsidiaries, please visit \
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We are the data controller of any personal information you provide to us or personal \
information that has been provided to us by a third party.  We collect and process \
information about you in order to arrange insurance policies and to process claims. \
Your information is also used for business purposes such as fraud prevention and \
detection and financial management. This may involve sharing your information with \
third parties such as insurers, reinsurers, other brokers, claims handlers, loss \
adjusters, credit reference agencies, service providers, professional advisors, our \
regulators, police and government agencies or fraud prevention agencies. 

We may record telephone calls to help us monitor and improve the service we provide.  \
For further information on how your information is used and your rights in relation \
to your information please see our privacy notice at \
https://www.ajginternational.com/Privacy-Policy/.  If you are providing personal data \
of another individual to us, you must tell them you are providing their information \
to us and show them a copy of this notice. 

Where you are obtaining a non-consumer policy of (re)insurance, or cover for \
additional risks or renewal under an existing policy, you are required to make a fair \
presentation of the risk to a (re)insurer which discloses every material circumstance \
which you know or ought to know relating to the risk to be insured. A circumstance is \
material if it would influence the judgment of a prudent insurer in determining \
whether to provide insurance for the risk and, if so, on what terms. Disclosure must \
be reasonably clear and accessible to a prudent insurer and made in good faith. The \
aforementioned duty of disclosure is the applicable duty under the laws of England \
and Wales. If your policy is not subject to English law you are expected to disclose \
risk information in accordance with the requirements of the applicable law. In such \
circumstances we expect you will disclose risk information at least equal to the \
standard required under English law and where the applicable law require!  s you to \
disclose information over and above the level required under English law you will \
provide such information in accordance with that law.

Where you are obtaining a consumer policy of insurance, you must read each question \
and answer honestly and fully and must take reasonable care to not make a \
misrepresentation.  

Failure to comply with the above disclosure requirements, as they apply to you, could \
mean that your policy of (re)insurance is void, its terms are materially altered or \
that (re)insurers are not liable to pay all or part of your claim(s). If you are in \
any doubt as to your obligations you should ask your usual contact.

This e-mail and any attachments are CONFIDENTIAL and may contain legally privileged \
information. If you are not the intended recipient of this e-mail message, please \
telephone or e-mail us immediately, delete this message from your system and do not \
read, copy, distribute, disclose or otherwise use this e-mail message and any \
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free and the above company does not accept any responsibility for any loss or damage \
arising in any way from its use.

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