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iSCSI is hung on W2K8 server, how to resolve?

Posted on 2011-09-16
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Last Modified: 2012-05-12
This is using MS Windows 2008 R2 server on my system. I've create few iSCSI targets on one of the NAS - Thecus 8800+. On this system, after setting up the iSCSI initiator, I can see all the iSCSI target from NAS, and subsequently mapped one iSCSI target. On disk manager, when I proceed to select to format the iSCSI target, the system hung. I want to resolve this issue without formatting whole system, how to resolve?
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Question by:MezzutOzil
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OliverLo earned 500 total points
ID: 36553773
Hi MezzutOzil,

I would need more details:
> are you using a iSCSI switch?
> are you using teaming to access to the target?
> did you implement MPIO (multi-path)?

This problem may be network related:
1. disable all TCP offload options
a. From the OS side you have to do that from the command prompt:
netsh int tcp set global rss=disabled chimney=disabled autotuninglevel=disabled
b. From the NIC side you have to do that from the NIC properties (or from management console such as BACS from broadcom). I would suggest to disable all form of offloading including the iSCSI offload engine.
2. decrease the MTU on the initiator NICs, target NICs and on the iSCSI switches
By decreasing the MTU you ensure that the network switches are able to handle this type of traffic.
To ensure you are using the basic MTU packet size of 1500, please disable Jumbo frame option in your NIC options on the initiator and on the target. Certain switches won't support data packet with maximal size.
3. If you have teaming enabled then disable it and check if you can format the remote disk.

Let me know if it works.

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Author Comment

by:MezzutOzil
ID: 36567362
Hi,

No matter what method I tried, I still can't solve the problem. At the end, formatting the system and it resolved...
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Author Closing Comment

by:MezzutOzil
ID: 36597046
ok
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