topic Re: How reliable is get-nalun alignment information? in Microsoft Virtualization Discussions

How reliable is get-nalun alignment information?

koenraad0 — Thu, 05 Jun 2025 06:19:49 GMT

The Command get-nalun | select path, alignment shows some misaligned luns.

I don't trust this information.

All these luns where created through snapdrive.

I tought that snapdrive would align luns from the start.

I found bug 103555 which states that some snapdrive versions did misalign luns.

But this relates to older versions of Data Ontap.

And I have 'misaligned' on luns that where created with snapdrive 6.4.1.

So how reliable is this information?

Before I start testing every single lun I would like to know where this information came from.

Can I use an ontap command to tell me the same?

Environment

Windows 2008R2 with Snapdrive 6.4.1

DataOntap 8.1 7-Mode

Powershall DataOntap version 2.0.0

Re: How reliable is get-nalun alignment information?

BAPTISTE_REVERET — Wed, 03 Oct 2012 22:17:08 GMT

I would definitely want an answer for that. I'm asking myself exactly the same question.

If anybody around know the answer...

Re: How reliable is get-nalun alignment information?

CHEYNECAPITAL — Wed, 19 Dec 2012 19:29:14 GMT

I have the exact issue, anyone know the answer? I have slow copies between luns on the same controller

Re: How reliable is get-nalun alignment information?

bsti — Wed, 19 Dec 2012 19:36:07 GMT

Check this out:

https://communities.netapp.com/message/58686#58686

In a nutshell, I don't think those values are 100% correct. Sometimes write patterns by database applications and others like it appear to NetApp to be misaligned activity.