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Which RAID should I use
I have a ReadyNas Pro 6 which runs on Radiator 4.2.31
The Pro 6 has 3TB, 3TB, 1TB, 2TB, 3TB, 3TB disks installed
I am in the processing of backing up my files before upgrading to OS6
I currently have X-RAID2 on my Pro 6 which gives me dual disk redundancy.
I have looked at the RAID calculator.
http://rdconfigurator.netgear.com/raid/index.html
I believe FlexRaid - RAID 6 will give me dual redundancy under OS6
However, with my current disk configuration this only gives a capacity of 3.62TiB
There is 8.19TiB that is unused
If this is correct then I guess I need to upgrade my disks
Is it therefore best to upgrade all my disks to 3TB
Using the RAID calculator this gives 10.19TiB of usable space.
Q1 - Is my assumption that it's best to upgrade my disks before I carry out the upgrade to OS6 correct?
Q2 - What is the best RAID configuration for me?
Q3 - RAID 6 will retain all my data even with 2 disk failures. What will RAID 5 give?
Thank you
SolwayMist wrote:
I currently have X-RAID2 on my Pro 6 which gives me dual disk redundancy.
This is a common mistake. While you can set up X-RAID2 for dual redundancy, the "2" doesn't mean you have done so. It just means XRAID version 2. Note OS6 just calls it XRAID again.
The rule for single-redundancy is "sum the disks and subtract the largest". With 4x3TB + 1 TB + 2 TB, that works out to 12 TB. Frontview shows space in TiB (labeling it incorrectly), so it would show about 10.9. If that's about what you are seeing, then you are using single redundancy now.
The rule for dual-redundancy is to "sum the disks and subtract the two largest". That would be 9 TB (or ~8.2 TiB). If you are seeing that now, then you are dual redundancy.
OS-6 will give you the same sizes, though you get to dual redundancy is a somehat different way. The calculator is confusing you because straight RAID-6 requires equal size disks. Dual redundancy XRAID2 only requires that the four largest disks be the same size.
To answer your original question: Which RAID should I use?
I recommend single redundancy XRAID in your case, with the caution that you should put a backup plan in place. (You should do that no matter what RAID mode you use). Investing in a backup solution is better choice than investing in dual redundancy.
Of course you could do both, but the backup solution is the higher priority.
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SolwayMist wrote:
I currently have X-RAID2 on my Pro 6 which gives me dual disk redundancy.
This is a common mistake. While you can set up X-RAID2 for dual redundancy, the "2" doesn't mean you have done so. It just means XRAID version 2. Note OS6 just calls it XRAID again.
The rule for single-redundancy is "sum the disks and subtract the largest". With 4x3TB + 1 TB + 2 TB, that works out to 12 TB. Frontview shows space in TiB (labeling it incorrectly), so it would show about 10.9. If that's about what you are seeing, then you are using single redundancy now.
The rule for dual-redundancy is to "sum the disks and subtract the two largest". That would be 9 TB (or ~8.2 TiB). If you are seeing that now, then you are dual redundancy.
OS-6 will give you the same sizes, though you get to dual redundancy is a somehat different way. The calculator is confusing you because straight RAID-6 requires equal size disks. Dual redundancy XRAID2 only requires that the four largest disks be the same size.
To answer your original question: Which RAID should I use?
I recommend single redundancy XRAID in your case, with the caution that you should put a backup plan in place. (You should do that no matter what RAID mode you use). Investing in a backup solution is better choice than investing in dual redundancy.
Of course you could do both, but the backup solution is the higher priority.
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