netapp lun

Posted on 2014-09-20
Last Modified: 2014-09-26
I have a volume which has only one lun.
The fractional reserve set to zero and it has enough space for snapshots.
Some reason the lun went offline . I checked the vol space and noticed  that is 99% used in free space.
i checked the snap list, but no snapshots since yesterday.
What is the reason the unused space in the volume goes low?
Question by:sara2000
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 4
LVL 42

Expert Comment

ID: 40334910
1.  Take a look at snapshots.  The combination of data and snapshots
2.  Take a loot at the LUN status using system manager.  It may be that the LUN is thin provisioned and is fragmented which is basically using up the space.  To get this cleaned up you'll need to use snapdrive after expanding the volume or LUN and then running  space reclaimation

Author Comment

ID: 40334929
Thank you for the reply.  Lun is mounted using snap drive. I see there are few snapshots . The combinations of data and snapshots fill the volume to 99%.
There is a free space in the os level.
Why the lun goes offline if we do not take snapshot ?
LVL 42

Accepted Solution

paulsolov earned 500 total points
ID: 40334945
you stated that there are a few snapshots.  If the snapshots and actual LUN data fill the Netapp volume the LUN will go offline to protect it from corrupting data.  Delete snapshots and/or grow Netapp volume to provide enough space for the LUN to operate.  

There are several reasons why the LUN may go offline, a snapmanager snapshot may be occuring or the LUN is thin provisioned and growing or LUN is a log volume for instance that keeps writing files and deleting them which may cause fragmented LUN.

Grow the Netapp volume, mount the LUN back up, run space reclaimation on snadrive for this LUN and review snapshots to make sure there are no old or orphaned snapshots in place
Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.


Author Comment

ID: 40335582
Thank you so much. This lun is being used by database. It is possible that lot of activities are taking place on this lun. Also it s being snap mirrored. The snapshots are kepis for 7 days.
Is there anyway we can find the space size of the each snapshot.
I noticed that % used is 50, 40 12 etc.
LVL 42

Expert Comment

ID: 40335751
Use Netapp System Manager and take a look at snapshots view for the volume in question

Author Comment

ID: 40335786
Sanpshot is scheduled for 11pm. I was expecting the snapshot will fill the space on the volume when the smapmirror runs at 11pm and the lun will go offline at that time if the volume do not have enough space for the snapshot..
But Lun went off line after few hrs of snap mirror.
LVL 42

Expert Comment

ID: 40335794
if volume is a log volume could be fragmented.  Run the space reclaimation from snapdrive.  It will ask if you want to run it but it will tell you how much space can be reclaimed.  What is the space break on netapp volume with respect to snapshots and LUN

Author Comment

ID: 40336302
Sanapshot auto delete removed the old snapshot (50% used) and took another snapshot last night, it is 0% used.
I was expecting to free up space when it delete 50%used snapshot, but it did not happen.
i checked the vol options and noticed that FR=0 and snap reserve=0.
Lun size has not been changed.
What the reason then the vol space has not been changed?
LVL 42

Expert Comment

ID: 40345504
Lun size is satic, did you run space reclamation on the LUN using snap drive?

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Ever notice how you can't use a new drive in Windows without having Windows assigning a Disk Signature?  Ever have a signature collision problem (especially with Virtual Machines?)  This article is intended to help you understand what's going on and…
This article is an update and follow-up of my previous article:   Storage 101: common concepts in the IT enterprise storage This time, I expand on more frequently used storage concepts.
This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question