ReadyNAS 628X Problems.

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BobFord wrote:

 

There was an earlier comment about the over capacity of the 12TB drives and the last 2TB not being 'used' - is this going to be fixed in a future OS release or are there other more technical issues to summount?

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It's not a bug, so it can't/won't be fixed.  It's fundamental to the way RAID-6 works. 

With classic RAID-6, you need at least 4 drives of the same size.  XRAID dual redundancy is more flexible, but it still uses RAID-6 RAID groups, and that means that the largest four disks all need to be the same size (12 TB in your case).  If you ignore that, then XRAID won't be able to use the full capacity of the largest disks.

With XRAID single redundancy you'd only need two drives of the largest size to use all the space.  But that's not what you have.

OK...a post Easter update.....

1) The resync has finished and all is now settled down, I can access the Admin screens and the folders/shares with Explorer

2) The capacity is still showing as 58TB - that'll keep me going for a while as I sort out my files repository

So, coming back to the issues of 12TB drives mixed with 10TB amd RAID6...

It would appear sensible given previous comments to replace the 12TB drives with 10TB drives and I could then use the 12TB drives in a attached storage unit (4 drives of 12TB). Would that be a sould way forward?

I really have appreciated the advice and guidance provided during the running of this thread

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BobFord wrote:

 

 

It would appear sensible given previous comments to replace the 12TB drives with 10TB drives and I could then use the 12TB drives in a attached storage unit (4 drives of 12TB). Would that be a solid way forward?

 

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Normally you can't downsize disks.  But in your case I think it will work, since the NAS is only using 10 TB on each of those disks.  But let's wait for mdgm-ntgr to confirm.

Sounds to me like the better option would be to gradually swap out the 10TB units and put them in the expansion unit and replace them with 12TB units.

Thanks for the assistance and guidance

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BobFord wrote:

Sounds to me like the better option would be to gradually swap out the 10TB units and put them in the expansion unit and replace them with 12TB units.

 

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That certainly will work, while swapping out the 12 TB disks might not.

You'd need to swap two more before you see a space increase (and at that point the capacity will increase by 4 TB).  After that you'd gain 2 TB per disk.

Thanks for that - something I will look to do in the coming months.

So, the device is now sorted as regards the resyncs and no bad disks - I also understand the issues of the differing disk sizes in a RAID6 environment. The problem left is that the device doesn't appear to be stable as regards availability. I have a network with 6 pc's accessing the device (or at least wanting to) but after a reboot (which is often a manual turn-off/turn-on as the RAIDar or Admin screen doesn work) I get availability across the network for a few hours and then the device appears offline, I can't get into Admin etc

Is this something that the logs may provide info or would it benefit from a techie taking a remote look?

I am happy to start a new thread if needed 

TVMIA

Bob

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BobFord wrote:

 

I am happy to start a new thread if needed 

 

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It'd be good to start a new thread, since the issues are quite different.