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Forum Discussion
Western Digital Red 4 TB: Any Hope for Ultra-6 HCL?
Right now, the only 4TB drive I see on the HCL for Ultra-6 is the Hitachi. The WDs, of course, being significantly cheaper....
There are two limits, and they both apply to the actual volume size, not the raw disk capacity.
One limit is that you can't expand from < 16 TiB to > 16 TiB in any circumstances. You could get 20 TB in the ultra-6 anyway (single redundancy) by doing a factory reset with all drives in place. Or 16 TB with dual redundancy. Further expansion is not possible.
The other is that a volume cannot grow more than 8 TiB from its starting point. So if you started with 2x1TB on your initial install you'd have a 1 TB volume starting point. The growth limit would take you to a bit more than 9 TB. So you wouldn't get to 14 or 16 in that case. I don't know what you actually had installed when you did the original installation, so I don't know what your actual growth limit is.
One limit is that you can't expand from < 16 TiB to > 16 TiB in any circumstances. You could get 20 TB in the ultra-6 anyway (single redundancy) by doing a factory reset with all drives in place. Or 16 TB with dual redundancy. Further expansion is not possible.
The other is that a volume cannot grow more than 8 TiB from its starting point. So if you started with 2x1TB on your initial install you'd have a 1 TB volume starting point. The growth limit would take you to a bit more than 9 TB. So you wouldn't get to 14 or 16 in that case. I don't know what you actually had installed when you did the original installation, so I don't know what your actual growth limit is.
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