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Netgear ReadyNAS NVX iSCSI Max Target Size Limit

Posted on 2012-04-05
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Last Modified: 2013-06-07
Hi everyone,

I have a Netgear ReadyNAS NVX with 4 1TB drives in XRAID 2, with about 2775GB of disk space running the latest 4.2.19 firmware.

When I create an iSCSI target on the readynas, it does not allow me to use all 2.7TB, I am limited to 2TB.

I read some conflicting forums where some users said 2TB was the limit, and others say it isn't and that a firmware released unlocked the functionality of going beyond 2TB.

Anyone run into this problem and able to solve it or is 2TB still the limit?
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Question by:CORPORAT
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Expert Comment

by:Darius Ghassem
ID: 37814268
You are limited to 2TB partition this is a limitation within Master Boot Table. You can use GPT drives within the GUID partition table.

http://msdn.microsoft.com/en-us/windows/hardware/gg463524
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Author Comment

by:CORPORAT
ID: 37823289
dariusg,

Thanks for the response. Sorry, I wasn't detailed in my initial post.

I'm referring to the actual ReadyNAS device web configuration gui, it doesn't allow me to expand an iSCSI LUN to greater than 2TB. I'm losing 700GB which I really need to use.
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Expert Comment

by:Darius Ghassem
ID: 37823342
Maybe we aren't understanding each other but Windows will not allow 2TB lun unless you are using a GUID partition table. ReadyNas might have that same restriction.
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Author Comment

by:CORPORAT
ID: 37832565
I completely understand, the LUN was formatted using GPT in windows, but the issue is that the ReadyNAS won't let us expand the LUN beyond 2TB, I was just curious if anyone else was able to go beyond that limit on the ReadyNAS NVX.
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LVL 59

Expert Comment

by:Darius Ghassem
ID: 37832609
I got you.

What firmware version are you running?

http://www.readynas.com/?cat=47
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Accepted Solution

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CORPORAT earned 0 total points
ID: 37840227
4.2.19 at the moment. I did some research and finally found some info. It turns out 4.2.12 introduced expansion beyond 2TB but ONLY if the current config was setup using 4.2.12 or later. For units that have had their config originally created using 4.2.11 or earlier, you'll have to factory reset. I'm going to get a large USB drive and run backups to it before I factory reset and then resetup the NVX and see if I can create a LUN using all 2.7TB of space.

Here are more details if you're interested.

http://www.readynas.com/forum/viewtopic.php?f=7&t=55057&p=312143&hilit=2tb+lun#p312143

http://www.readynas.com/forum/viewtopic.php?f=126&t=47087
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Author Comment

by:CORPORAT
ID: 37920119
I was able to Factory reset the ReadyNAS and was able to use all 2.7TB of disk space for iSCSI. The factory reset once it's on 4.2.12 or higher will format the array with EXT4, thus allowing you to pass the 2TB file limit on EXT3 which was being used before 4.2.12.
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Author Closing Comment

by:CORPORAT
ID: 37936128
Nothing official that I found from Netgear, just forum discussions, tested and verified a factory reset is the only way to get 2TB+ iSCSI LUNs on a unit that was originally setup with firmware 4.2.11 or earlier.
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Author Comment

by:CORPORAT
ID: 39229672
This problem was reintroduced in a later version. I had upgraded to 4.2.23 and needed to recreate an iSCSI target, and it won't let me create an iSCSI target larger than 2TB again. Wiping and setting up the unit from scratch does not fix it. Tried 4.2.22, same problem.

Going to have to roll back to 4.2.19, factory reset and setup again. Thanks a lot Netgear for the wasted time.
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