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Why VMware does not see the iSCSI device as storage, after upgrading to DSS V6?

Article ID: 672
Last updated: 12 Aug, 2009


I update my system to V6, but for some reason I cant see my iSCSI devise in my VMware.


This document applies when the “IET” iSCSI target was changed to “SCST” and VMware ESX does not see the iSCSI device as storage and none of Virtual Machines placed on this storage are working.
The reason is by default the DSS V6 uses “SCST” for the Target solution, so when upgrading from DSS or iSCSI-R3 to DSS V6 you will need to change this setting from the Console screen and set this back to your original configuration of “IET”.
In order to switch back to “IET” iSCSI target from the default iSCSI target “SCST solution” please enter from the Console screen the hot-key: CTRL+ALT+W - > Tuning Options - > iSCSI daemon options - > iSCSI solution.  No reboot is necessary.
Please note that there is advantage of using new “SCST” for your iSCSI targets as there is no need to reset the target while adding or removing LUNs. This is vital to virtual environments!
Instructions provided by VMware will work but only for ESX 3.0 and 3.5 but not for ESX 4.0. In ESX 4.0 there is no setup for LVM in the advanced settings.

Please go to VMware’s KB to read the instructions on how to recreate signatures on iSCSI storage under Esx 3.0/3.5:
Below are the step by step instructions on how to recreate the signature on the iSCSI storage in Esx 4.0

It is possible to do this in 2 ways first using Maintenance Mode and not using it, if not using MM skip steps 2 and 5:

1. Log on to the ESX host with VMware Infrastructure (VI) Client
  - remove your VMs from inventory we will add them later
2. Go into maintenance mode
  - From top menu bar select Inventory
  - then select Host
  - finally click on the Enter Maintenance Mode
when the pop-up will appear click yes
3. Then Click the Configuration tab
  - Go to Storage Adapters
  - Then Rescan (it will take some time about 1-5 min) it is possible that you will have to rescan 3 or 4 times before the iscsi disk will appear
4. Go to Storage
  - Click Add Storage
  - Window will appear, select Disk/LUN and then click Next
  - You will see your old storage, select this and click next (If field will be empty wait up to 1min to see storage)
  - Now you will have three options to choose, select Assign new signature and click Next
  - Additional info will be displayed, click next
  - And Finish
  - To see the iscsi disk click refresh or wait about 30 seconds
5. To add Virtual Machines that was removed you must exit maintenance mode:
  - From top menu bar select Inventory
  - then select Host
  - finally click on the Exit Maintenance Mode
6. Virtual Machines
  - From tabs click on Virtual Machines
  - On the screen right click and select New Virtual Machine
  - Select Custom (in order to be able to add old VM) and Next
  - Enter name and then click Next
  - Select old storage and then click Next
  - We are assuming you know how to add the VM so we will skip the next few steps
  - When you reach to the section of Select a Disk you must select Use an existing virtual disk and click Next
  - Then select your VM from storage and click Next
  - In Advance Options you should use suggested selections and click Next
  - And Finish

Now you will have your old VM’s ready to use.

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Article ID: 672
Last updated: 12 Aug, 2009
Revision: 1
Views: 12826
Posted: 11 Aug, 2009 by --
Updated: 12 Aug, 2009 by
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