RN 316: 6-TBb Drives, Real-World?

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PeteCress wrote:

On my Ultra 6 running OS-4, I started out with 6 2-tb drives.

 

Eventually I upped it to having 6 3-tb drives and it was able to take advantage of all 3 terabytes on each drive.

 

But then I added a couple of 4-tb drives and hit the wall: it uses 3 tb of each, but to use the whole 4 tb, I would have to do a Factory Reset on the box and then re-load it from backup.

 

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OS 4.2 has two XRAID expansion limits:

• a volume can not expand over a 16 TiB ceiling
• a volume cannot grow more than 8 TiB larger than it's initial size.

6x4TB exceeds both limits.  You should have been able to upgrade to 3x4TB+3x3TB, unless you started with something smaller than 6x2TB when you did the factory install.  Probably not worth troubleshooting now.

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PeteCress wrote:

 

Bottom Line: What is the smallest size drives I can start out with on the 316 and still be able to upgrade to 6-tb drives later on without doing a Factory Reset and re-loading?

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OS 6 doesn't have any known expansion limits.  The smallest drive on the HCL is 80 GB, the biggest drive on the HCL is 10 TB.  So if you stick with the HCL, you can expand from 1x80GB to 6x10TB.  6x12 TB probably also works, though I haven't seen any posts from people who are using 12 TB drives yet.

Note these limits would also disappear on your ultra if you switch to OS 6.