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RN516 Expansion to 24TB?
I'm rapidly running out of storage space on my RN516, running OS 6.10.4. I have about 1.64TB free of a total of 18.17TB of available space. I'm running RAID 5 on 6 4TB hard drives. I use this NAS...
Thanks for the valuable tips on Snapshots. I will make sure all 4 NAS's are setup this way. I've schedule in Scrubbing, Defragmentation, and Balancing to run every 4 months, after an initial run in January!
Yes, I'm using X-RAID with the 6 4TB drives in Raid-5.
Is there a calculator or formula that I can use to determine the most economical path to expanding the volume?
If I'm replacing 2 drives in the NAS (one at a time, as you suggest), what is the impact of using a 6 TB vs 12TB
or even 16TB drives? Trying to do some cost/benefit analysis on getting the most space.
Perfect! Although, I noticed it doesn't include 18TB harddrives yet!
I'm using the ReadyNAS Pro RNDP 6350, running OS 6.10.4, as a backup to the RN516. Any concerns about expanding the volume past the current 18TB (6 x 5TB X-RAID 5) as well?
bedlam1 wrote:
The Raid calculator is HERE
Yes, but it doesn't really handle expansion.
If you are using XRAID, and you upgrade disks to sizes that are at least as large as the largest disk already in the NAS, then the capacity rule is "sum the disks and subtract the largest".
So if you start with 6x4TB and upgrade two disks to 6 TB, you'd increase the volume size from 20 TB (~18.2 TiB) to 22 TB (~20 TiB).
As far as cost-effectiveness goes, it is generally more cost effective to upgrade fewer disks using sizes.
If, for example, we assume Seagate Ironwolf drives then
- Two 6 TB drives would cost about $320 at current prices, and you gain only 2 TB of space. That works out to $160 per TB gained. Adding a third drive later would cost $160 and gain you 2 more TB ($80 per TB gained).
- Two 12 TB drives would cost about $600 and you gain 8 TB - costing $75 per TB gained. Adding a third drive later would cost you $300, and gain you 8 more TB ($37.50 per TB gained).
I've ordered 2 16TB Seagate Barracuda drives for each NAS. Is there a practical limit to the size of the volumes on the RN516 & ReadyNAS Pro (OS6)?
There is no known limit except the huge (petabyte, I think) limit for BTRFS. Is there a practical limit where CPU power or available RAM would start to slow things down, not that anyone has yet found, AFAIK. Before moving to a rack-mount system, I had 6 x 6TB in a 516, with 5 x 4TB in an EDA500 and 5x3TB in another eSATA chassis. Though the eSATA expansions were slow just because eSATA is not really suited for RAID, the 516 handled it all just fine as long as the expansion hardware behaved.
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