SAN Interview Questions

1. What is LUN?
Ans:

•  lun is logical unit of number, which represent the physical unit of storage disk
• It is block level access
• Supporting operating system like Windows, Solaris, Linux, aix, and more
• Supporting protocols is FC and ISCSI

2. What kind of configuration FC or ISCSI? 

Ans:  Fc configuration (multi path)

3. What kind of Configuration is this? 

Ans: ISCSI (single filer)

4. What distinguishes FCP from iSCSI in a SAN environment?
Ans: 

FC	ISCSI
Block level access transfer through Fc switch fast and  flexible	Block level access Ethernet slower than Fc

5. Give an example of an attribute that needs to specified when creating a LUN

Ans:  lun size, volume or qtree name, igroup name, operating system type

6. Name three ways to create a LUN
Ans: 

• lun create in cmd
• Lun setup in cmd
• Filer view
• Snap drive in host side

7. TO DISPLAY LUN:
Ans: lun show [path] [/vol/vol_name/lun_name]

8. TO CHECK ALL LUN/IGROUP/FCP SETTINGS FOR CORRECTNESS:

Ans: lun config_check [lun path]

9. TO GET THE SERIAL NUMBER, TYPE AND MAPPING OF A LUN:
Ans: lun show -v

10. SHOW THE MAPPING OF A LUN:
Ans: lun show

11. TO SHOW SPLITTING LUN CLONES:
Ans: lun show -c

12. TO CREATE A LUN:
Ans:

Syntax : lun create –s(size) –t (os type) lun path

Example: lun create –s 100g –t windows /vol/vol_name/lun_name

13. TO DESTROY A LUN:

Ans: lun destroy [-f] lun_path [lun_path ...]

14. TO ENABLE THE LUN and TO DISABLE THE LUN:
Ans:

Enable lun : lun online [lun path]
Disable lun : lun offline[ lun path]

TO MAP THE LUN TO THE IGROUP and TO UNMAP A LUN:
Ans:

lun map: lun map /vol/vol1/lun1 igroup_name

lun un map: lun unmap /vol/vol1/lun1 igroup_name

15. TO FIND MAXIMUM SIZE OF A LUN FOR A VOLUME OR QTREE:
Ans:

lun maxsize /vol/vol3/

It shows:

With out snapshot reserve: 102.0m (106928640)
With snapshot reserve: no space
With complete snapshot reserve: no space

16. TO CHANGE THE SIZE OF A LUN:
Ans: lun resize /vol/vol3/lun3 +20m

17. TO CREATE A LUN CLONE:

Ans:

To create lun clone we must create one snapshot for lun contain volume

Snap create vol_name snap_name

lun clone create [new lun path] –b [parent lun path] snaphot name

18. TO SPLIT A LUN CLONE FROM A PARENT LUN:
Ans:

Once we created lun clone, new colne is attached to the parent lun, manually we need to split.
lun clone split start -d /vol/vol3/clone_lune

19. TO STOP A LUN CLONE SPLITTING PROCESS:
Ans:

lun clone split stop <lun_path>

20. TO SEE THE STATUS OF LUN CLONNING:
Ans:

lun clone split status

21. TO SEE THE COMMENT FOR A LUN:
Ans:

lun comment <lun path>

22. TO RENAME A LUN:
Ans:

lun move <old lun_path> <new_lun_path>

23. TO GET THE SERIAL NUMBER OF LUN:
Ans:

lun serial [lun path]
lun show -v

24. TO GET SERIAL NUMBER OF LUN IN HEX FORMAT:
Ans:

lun serial -x [lun path]

25. TO SET THE SERIAL NUMBER OF LUN:
Ans: 

lun set


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