Here it has been described how to use different type of shells in the Netapp cluster mode 8.x storage

1. Differentshells for CLI commandsin cluster mode 8.x NetApp
storage-:
What is shell?
Ans- Shell is an interface through which user can interact with the kernel (broadlyyou can say
Operatingsystem, as Kernel is the core of the operatingsystem)
In a simplelanguageshell accepts user commands,applicationsandtranslateintothe computer
readablebinary or languageto interact withthe Kernel andafter operation,giveback the outputof
the commandas a user readable formatto the user throughthe shell.
In NetAppstorage there are three typesof shellsforCLI(CommandLine Interface)
1. Clustershell
2. Node shell
3. Systemshell
1.Clustershell-:
The clustershell isthe native shell thatisstartedautomaticallywhenyoulogintothe cluster.
It providesall the commandsyouneedtoconfigure andmanage the cluster.
In thisshell youcanexecute yourrequiredcommandtodorequiredtaskandto do the troubleshooting
or day to day tasksthroughthe commandmode.
In the promptif you type the questionmarkitwill give youall the availablecommands.

2. Apart from thisif you type man command name it will give you the complete descriptionofall the
relatedcommands. For example,as below.

3. 2.Nodeshell-:
The node shell isa special shell forcommandsthattake effectonlyatthe node level,asoutcluster
consistsof multiple nodes,sowe cango each andindividual nodesandexecutethe commandforthat
particularnode to dosome requiredtaskinthe respective nodes.
Execute the belowcommandinthe clustershell toknow how manynodesthere inthe Clusterare.

4. (Or)
Cluster1::> systemnode show
Node HealthEligibilityUptime Model Owner Location
--------- ------ ----------- ------------------------ -----------------------
Node1
true true 13 days19:29 FAS8040
Node2
true true 13 days19:29 FAS8040
2 entrieswere displayed.
So as perthe above output isa two-node cluster.
Now we can go to each individual node to get access the node shell-:
Example-:
Cluster1: :>systemnode run -node <nodename>
(Or)
Here alsoyou can type the questionmarkinthe prompt(?) to get the listof commandsand man
commandname to get the detailsof the command

5. It is almost equal to all your Data ontap 7 mode commands

6. To come out from the node shell,type exittogetthe clustershell.
3.System shell -:
The systemshellisalow-levelshellthatisusedonlyfordiagnosticandtroubleshootingpurposes.Itis
not usedforgeneral administrativepurposes.Youaccessthe systemshell onlywithguidancefrom
technical support.

7. To access the systemshell,youneedone accountname calleddiagnosticaccount,username called
“diag” . By usingthis“diag” accountyou can performthe troubleshootingtasksinthe systemshell.
The “diag” account bydefaultisinlockedstatus,we needtounluckitand byusingthe password of
“diag” userwe needtoaccessthe systemshell,throughthe advancedcommand “systemnode
systemshell”
Process-:
How to unluckthe diag account-:
(Or)
Login to the diagnosticmode
Login into the system shell-:

8. (Or)
Example of cat command in the systemshell-:
To exit from the system shell-:
Exit from the diagnosticmode to admin mode

9. See the status of the diag user
To recognize differentshellsbyseeingthe prompt as below-:
Note- I have marked my hostnameina white paint asI don’twant to reveal the nameof my business.
Please don’tuse system shell and advancemode commandwithoutsuggestionby the NetApp. All the
commandsare very dangerous,itmay create a panicso take the helpof NetApp and execute as per
your requirement.
Thank you!
Saroj (NCDA Certifiedengineer)