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Forum Discussion
Advice on replacing ReadNAS Pro 6 with 2x 4 Bay ReadyNAS boxes.
I have a ReadyNAS Pro 6 with 6 x 3TB drives in Raid X which I think gave me 12TB of usable storage. My ReadyNAS recently suffered some sort of corruption that made the volume inaccessible. This h...
This may give you some "what if" guidance
The limitation where we used the capacity of the smallest disk was for X-RAID on our legacy Sparc boxes. We discontinued the last of those several years ago now.
On newer boxes than that we use X-RAID2. With the default single-redundancy (uses RAID-5 with three or more disks) you would get the capacity of your drives summed minus the capacity of the largest disk minus some overheads.
With X-RAID2 dual-redundancy (uses RAID-6 and thus requires a minimum of four disks) you would be limited to the capacity of the 4th largest disk (as a RAID-6 layer requires a minimum of four disks)Thanks guys.
If I have two boxes then I think RAID 5 with single redundancy will provide enough protection and provide for my incremental upgrade to bigger disks.
As mdgm says, the capacity rule is "sum the drives and subtract the largest". 6x3TB with default XRAID would give you a 15 TB volume. The Pro-6 reports that as 13 TiB (but it uses a TB label, which is confusing). (1 TiB = 1024*1024*1024*1024 bytes, 1 TB = 1000*1000*1000*1000 bytes).
-You might consider starting with 3x4TB instead (if that leaves you enough free space). That costs about the same, and gives you an expansion slot for later.
-OS 6.6.0 has an interesting new backup method you might look into - that would require two RN314 though.
I recommend getting NAS-purposed disks (WDC Reds, Seagate VNs), or enterprise. I don't recommend desktop drives.
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