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May 17, 2026

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How does NFS access works for version nfsv3 & nfsv4 in ONTAP

When a mount command is issued to an ONTAP NFSv3 server from an NFS client, the following occurs: 1. RPC is made to port 111 (portmapper) of the NFS server to attempt a TCP connection through the portmapper. 2. When the RPC call has been acknowledged, portmapper issues a GETPORT call to port 111 of the NFS server data LIF to obtain which port NFS is allowed on. 3. The NFS server returns the port 2049 (nfs) to the client. 4. The client then closes the connection to port 111. 5. A new RPC call is made to port 2049 of the NFS server data LIF. 6. The NFS server returns the call successfully and the client sends an NFS NULL call to port 2049 of the NFS server’s data LIF. This action checks whether the parent volume allows access to the mount. In this case, the parent volume is mounted to /, or the SVM root. 7. The NFS NULL call is returned successfully and the client proceeds with the mount attempt. 8. Portmapper sends a GETPORT call to the NFS server’s data LIF asking for the mou...

How to collect NetApp cluster ontap logs

Following instructions applies to both Cluster Ontap 8.x, and ONTAP 9.x. Collecting logs in Cluster Ontap is made very easy with GUI access. 1. Identify Cluster management LIF IP of your cluster. If you don't know you can simply run this command. cluster_ontap_9::> network interface show cluster_ontap_9 cluster_mgmt up/up 192.168.0.240/24 cluster_ontap_9-02 e0d false In this case, clust_Mgmt LIF = 192.168.0.240 2. Open any browser window and type ...

Configuring Multipath for redhat (centos7-3.10.0-862.el7.x86_64) in simple straight forward steps for ISCSI LUN on ONTAP 9

Straight forward steps from installing multi-path module to configuring multipath.conf file as per NetApp ISCSI redhat recommendation: [root@redhat ~]# yum install device-mapper-multipath [download the multipath module binary] [root@redhat ~]# modprobe dm-multipath [insert the module] [root@redhat ~]# lsmod | grep dm_mod [list the module to confirm] dm_mod 123941 11 dm_multipath,dm_log,dm_mirror One of the good feature of Linux is the ability to ' load' modules while the kernel is running : Each piece of code that can be added to the kernel at run-time is called a module. Each module is made up of object code that can be dynamically linked to the running kernel by the insmod (modprobe) program and can be unlinked by the rmmod program. Next... [root@redhat /]# mpathconf --enable --with_multipathd y The command above will create the multipath.conf file, if it does not already exists. Next... Blacklist...

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