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Ready NAS 104: Replacing a 2TB drive with a 4TB one?
I spotted an error message on my Ready NAS Admin page this afternoon and so am investigating replacing one of the drives. This was the message: -------------------- "Disk: Detected increasing real...
KRT-UK wrote:
I've read the manual and the replacement looks simple enough to do. I have X-RAID turned on and so I'm reasonably confident that hot-switching the old 2TB drive out for a new one won't mean the loss of any data.
Correct. Though we do recommend updating (or making) a backup first. If a second drive fails during the resync process, you will lose all the data.
KRT-UK wrote:
What if I replace all of the drives over a period of time with 4TB drives? Can the software cope with that?
Yes. Currently you have 6 TB of storage (reported as 5.45 TiB). There would be no increase when you hot-swap the first drive. But you'd see a 2 TB increase for each drive after that - ending up with 12 TB total. The capacity rule is "sum the drives and subtract the smallest".
Note that the capacity rule assumes that you are either
- replacing a drive with one of the same size
- replacing a drive with one that is greater or equal to the largest drive currently installed.
Thank you!
You may want to look at even larger drives. I believe the best bang for the buck right now is 8TB for most brands/models if you eliminate the SMR varieties that you should avoid for RAID. Replacing two drives with 8TB will immediately bump you up to double your current capacity, and each additional 8TB you swap in later as you need the space will bump you another 5.4TiB.
Sandshark wrote:
I believe the best bang for the buck right now is 8TB for most brands/models if you eliminate the SMR varieties that you should avoid for RAID.
Two 8 TB NAS-purposed drives would cost about $500 looking at current US pricing. Four 4 TB drives are about $420. So the initial outlay would of course be more. But going 2x8TB+2x2TB now would be more cost effective in the future (letting you expand to 18 TB by upgrading one of remaining the 2 TB drives).
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