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iSCSI iniator

Posted on 2013-11-12
Last Modified: 2014-04-29
I have a storage server which i connect my domain controller to using iSCSI. When i first set it up it all went smoothly but recently i have found iSCSI link dropping out. I can log back on to the target but the volumes do not appear exposed by the target. In the past a few reboots seem to have done the trick but that isnt really a very convenient solution. I know the initiator side is working correctly because that machine also connects to another iSCSI target.

I have reassigned the target to the virtual disk on the iSCSI software target and even used IP addresses instead of the IQN but still no difference.

Any suggestions gratefully received
Question by:chrisryan43
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LVL 119
ID: 39641970
Software iSCSI is dependent upon good networking, so it you are losing connection with the iSCSI target, do you have issues with the network interface in this computer?

Author Comment

ID: 39641993
I believe the networking is good (they are physically located next to each other and go through the same switch, pinging reliably etc)

The reason the connection was lost was because the RAID array on the target fell over. HP believe it was a firmware issue on the controller which has now been updated so hopefully shouldnt happen again

I have since rebooted both machines once which didnt resolve the issue and because everything else is working fine i am reluctant to try any more reboots and cause further disruption to the users.

Do you have any other thoughts?

Thanks for your time on this
LVL 119

Accepted Solution

Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 39642022
Since you had difficulties, establishing this connection, after a storage outage, I would remove it, and setup again.

iSCSI connections, should re-connect correctly and establish themselves, if storage is available.
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LVL 21

Expert Comment

ID: 39642067

This can be caused when the iSCSI initiator service is not started before the server service.

Is the server service started at the time of issue? if not, start it and see it appears fine. If it works, you need to add a multi-string value for iSCSI  as depends on service  in server service.

Author Comment

ID: 39645650
I had attempted to restart the service but still no joy but i  had some windows updates to apply so gave the server a restart and still nothing. I'm nervous about doing too much on the server side in case i inadvertently erase the RAID. I'm currently in the process of backing everything up elsewhere so that i can play a bit more

Author Comment

ID: 39647439

So this is where i am at.....

I created a new 'Test' virtual disk on the storage server and this then connected fine with the iSCSI initiator. So i then deleted the virtual disk for the one i am having issues with (just within iSCSI software target - not the .vhd file). I also deleted the cbm file just  in case it helped. I then reimported the vhd file back into the software target and it still wont be be seen by the iSCSI initiator. The virtual disk mounts locally fine so i am happy that the file system is  all ok. I am really starting to run out of ideas now
LVL 119
ID: 39647445
I would escalate a support call to Microsoft on this issue.

Author Comment

ID: 39647452
*UPDATE* - i just realised that i hadn't added the domain controller back as a device target after reimporting the virtual disk. I have now done it and all is  working. So the delete/import of  the virtual disk (and deleting the cbm file) seems to have fixed it.

Thanks for your time and suggestions on this
LVL 119
ID: 39647464
Glad it's all working again.

Author Comment

ID: 40006125
I've requested that this question be closed as follows:

Accepted answer: 0 points for chrisryan43's comment #a39647452

for the following reason:

Closing the question
LVL 119
ID: 40006126
If my Answers have aided you in this solution, please assign points.
LVL 119
ID: 40028914
3. Accept http:#a39642022

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