Deduplication

Deduplication Overview -- NetApp Storage Efficiency :

Deduplication is a technique which is used to reduce space by discarding duplicate blocks.

when SIS (single instance storage) is run on volume it scans each and every block and assigns digital signature and then it will compare all the signatures. The block which have same signature is considered to be having same data, hence it will keep only one block and discards remaining blocks. 

The inodes are adjusted to point only one block.

Deduplication – The NetApp Approach

WWNN and WWPN

In a Fiberchannel network, each network node has a World Wide Node Number (WWNN). Every network node has one or more World Wide Port Numbers (WWPN).
Imagine a street where many buildings have a house number. There can be some little houses for one familiy having one entrance as well as a big company having a house number but multiple entrances. In the latter you could drive to "XY corporation, Example Drive 38, Entrance D". 38 is the house number - or the World Wide Node Number. "D" would represent the entrance or the "World Wide Port Number".

The WWPN (World Wide Port Number) is an absolute and unique address - the world wide node address may have many ports assigned to it. Communications take place  between WWPNs. Normally, WWPNs may be derived from the WWNN. Look at the following graphic which shows a very easy configuration: (there are some vendors where the WWPN may not be derived from the WWNN of the device, this is a very simple example)

CIFS issues

Scenario #1 - For whatever reason when looking for a domain controller it wasn't "attaching" to the local domain controller.  The system would ask for a list of domain controllers but then try to communicate with remote AD servers, some of which were behind firewalls.  NetApp is nice enough to allow us to "pin" the storage to a preferred list of domain controllers to correct this behavior.  From the command line, use the following commands:

AIX

AIX Practical Guide link

This site very helpful for your work !

WAFL_check

Wafl check is a Data ONTAP utility to repair filer volumes which repair the inconsistency in the volumes.

WAFL check steps :

Data ONTAP (test.com)

login: root
Password:


Filer1> reboot

Quotas

A quota limits the amount of disk space and the number of files that a particular user or group can consume.

A quota can also restrict the total space and files used in a qtree, or the usage of users and groups within a qtree.

A request that would cause a user or group to exceed an applicable quota fails with a “disk quota exceeded” error

A quotas can assign for USER, GROUP, & QTREE

Steps to ASSIGN quotas