These following top 10 common CLARiiON/VNX technical FAQs were compiled from numerous service requests received by remote support for EMC Unified Storage Division.

Question 1:

How to quickly find the disk TLA part number through command NaviCLI?

Answer 1:

Type the following command:

#naviseccli -h 10.32.106.174 getdisk 1_0_0 -tla

Bus 1 Enclosure 0  Disk 0

Clariion TLA Part Number: 005049274

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Question 2:

How to raise the rebuild priority of LUN to expedite rebuilds?

Answer 2:

For traditional LUN, there are two kinds of methods to raise the rebuild priority of LUN.

Method 1:  From Unisphere Manager GUI: 

      1. Right-click the LUN to check its current rebuild priority.

      2. Select Properties and check rebuild priority under General tab.

      3. If rebuild priority is not set as desired, set it to an appropriate one here.

      4. Click the Apply button. 

Method 2: From Navisphere CLI

      1. Verify current status of rebuild priority of the LUN using NaviCLIcommand:

          navicli h  IP_address>   getlun   < ALU_number>

          Sample Output:

            C:\Program Files\EMC\Navisphere CLI>navicli -h 10.14.117.147 getlun 0

            -

            -

            Current owner:        SP A

            Offset:               0

            Auto-trespass:        DISABLED

            Auto-assign:          DISABLED

            Write cache:          ENABLED

            Read cache:           ENABLED

            Idle Threshold:       0

            Idle Delay Time:      20

            Write Aside Size:     2048

            Default Owner:        SP A

            Rebuild Priority:     ASAP

            Verify Priority:      Medium

            -

            -

    2. If the rebuild priority is not set as desired, go to Step 3.

    3. Change the rebuild priority using NaviCLI command:

            navicli h <SP_IP_address> chglun  l  <ALU_number>  -r   

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Question 3:

How to change the expansion rate for Meta LUN?

Answer 3:

Method 1: From Unisphere Manager GUI: 

      1. Right-click the Meta LUN to check its current expansion priority.

      2. Select Properties and check Expansion Rate under the General tab.

      3. If Expansion Rate is not set as desired, set it to appropriate one here.

      4. Click the Apply button. 

Method 2: using NaviCLI command “metalun -modify”.

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Question 4:

When files are deleted from the Thin LUN, why isn't the deleted files' space free in the Unisphere manager GUI?

Answer 4:

The deleted file data is a characteristic in the file system level. VNX doesn’t recognize the operation in the file system level, so the deleted files space is not free. The Thin LUN doesn’t automatically compress after deleting the files. If you want to free the space, you can delete the original large LUN, and then create a new LUN.

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Question 5:

How to confirm the position of the Disk cabinet?

Answer 5:

You are able to do the following operation to confirm the position of the Disk cabinet:

(1) The category of the disk cabinet for CLARiiON is DAE2P/3P, the customer and EMC engineer are able to press the LCC button to manually set the disk position. As shown below, if the customer manually set, bus1 can label the disk cabinet Enc 0 and 2, no Enc 1 is ok.

(2) The category of disk cabinet for VNX array is DAE6s, there are no buttons in the LCC. SAS bus will scans array beck layout, and then automatically determines the location of disk cabinet. As shown below, this position is displayed in the LED lights on DAE.

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Question 6:

Why can’t we create mirrors or add a secondary mirror in the LUN?

Answer 6:

If there is copying software running on the LUN, we can’t delete the LUN, or we can’t create a mirror.

(1) The output from the following command will vary depending on which layered applications are on the target LUN’s stacks:

Navicli -h <IP_address> getlun –messner <LUN_number> -stack

(2) Type the following command to remove the applications on the LUN:

Naviseccli -h <SP_IP_address> mirror –async –setfeature–off –lun <LUN_number> or naviseccli -h <SP_IP_address> mirror –sync –setfeature –off –lun  <LUN_number>

For more information, please refer to the 83277/7546.

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Question 7:

How to convert Thick LUN to Thin LUN?

Answer 7:

Currently, we are not able to directly convert Thick LUN to Thin LUN, but we can migrate the data from Thick LUN to Thin LUN.  

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Question 8:

What’s different between trespass mine and trespass all?

Answer 8:

Please refer to the explanation as below,

Naviseccli –h spa trespass all      // Trespass all LUNs to the SPA

Naviseccli –h spa trespass mine      // This will Trespass all the LUN’s owned by SPA

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Question 9:

Where is the network management port and service port in the VNX?

Answer 9:

Below is the rear view of a VNX. You can see that there are two network ports. The port with mark I in the left side is used for service. The port in the right side is used for management.

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Question 10:

How to check the LUN rebuilding process when replacing the disk?

Answer 10:

From Unisphere Manager GUI: 

1. Right-click the LUN to check its current Rebuild process.

2. Select Properties and check rebuild process under General tab.

                                                                                                

             

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