Netapp LUNs (7-Mode)

Introduction

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- by default,block size is 4096 bytes (4 KB)

  source: https://kb.netapp.com/index?page=content&id=3011193&pmv=print&impressions=false

- max size that can be created is 16 TB (but in practice, I was only able to

  create a 15.9 TB LUN in Data ONTAP 8.2.2RC2 7-mode):

  source: https://library.netapp.com/ecmdocs/ECMP1196906/html/GUID-AA1419CF-50AB-41FF-A73C-C401741C847C.html

Commands

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Displaying

# quick check of status lun show # detailed info lun show -v # lun mappings lun show -m

Creating

# w/ space reservation lun create -s [k|m|g|t] -t lun create -s 6t -t vmware /vol/sql30_vol/lun0 # w/o space reservation lun create -s [k|m|g|t] -t -o noreserve lun create -s 6t -t vmware -o noreserve /vol/sql30_vol/lun0 ** ostypes: vmware, windows, windows_2008, linux, solaris, etc ** NOTE: use  "vmware" ostype for provisioning LUN to ESXi

Mapping & Controlling availability

# mapping lun map lun map /vol/devLuns/lun16 DEVCLUSTER 16 ** LUN ID generates next available number if you don’t enter a value # unmapping lun unmap lun unmap /vol/devLuns/lun16 DEVCLUSTER 16 # availability lun online lun offline

Resizing

# incremental lun resize +[g|M] # absolute (BE CAUTIOUS OF THIS COMMAND!!!) lun resize

Modifying

# setting space reservation lun set reservation [enable|disable]

Deleting

# deletes a LUN lun destroy ** this will automatically reclaim space inside containing volume

Tutorials / Tips and Tricks

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to verify if a LUN is thin or thick provisioned	1. check its footprint on its containing aggregate 2. see "guarantee" option under "vol status -v"
unmapping a LUN in live environment	1. stop all host side applications accessing the LUN 2. bring the LUN offline 3. unmap the LUN
How to identify the correct LUN in vSphere?	1. Go to ESX host Configuration > Storage Adapters >    Select the LUN below > CTRL+C to copy 2. Go to http://string-functions.com/hex-string.aspx and convert    the identifier 3. Login to Netapp device and hit "lun show -v /path/to/lun" 4. Compare the serial numbers in #2 and #3 and see if it matches    (just ignore some odd ascii characters in #2)
Actual commands in destroying a LUN	LUN name: /vol/devsql13_vol/lun0 df -h /vol/devsql13_vol/ lun offline /vol/devsql13_vol/lun0 lun unmap /vol/devsql13_vol/lun0 ESX_NON_PROD lun destroy /vol/devsql13_vol/lun0 df -h /vol/devsql13_vol/
expanding a windows drive by 250 GB	1. create lun in netapp: lun create -s 250g -t windows /vol/devluns/lun11 2. resize filesystem on host side: use diskpart or diskmgmt.msc
Checking for WWN	1. check serial filer> lun show -v /vol/vol1/lun0  40m (41943040) Serial#: "OdCvFnbbKzih" ---truncated--- 2. check wwn filer>  igroup show shpc (FCP) (ostype: windows2000): 10:00:00:00:c9:2b:fd:8e

Troubleshooting

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VMWare VMs are inaccessible after reboot of Netapp filers (inconsistent state)	- refresh the storage nodes on ESX clusters to resolve the issue
netapp slow lun	http://networkadminkb.com/KB/a510/how-to-fix-slow-read-performance-increased-latency.aspx