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RN314 Vertical expand of 4x2TB disks calculating total capacity
Hi community,
i do have a netgear 314 running on latest firmware and 4 x 2 TB hard disks in tradition raid (one logical drive)
I am planning to replace two of the hard disks with 4 TB drives each.
so that finally NAS runs with 2x2TB + 2x4TB. Nor,ally I would not only replace 2 drives but the calculator in the web promised me a gain of 2TB (Increased cap from 6 to 8TB) when XRAID is used.
I have used this calculator to calculate final capacity after the upgrade.
http://rdconfigurator.netgear.com/raid/index.html
But now I am confused why X-RAID does calculate result of 8 TB while traditional RAID 5 calculates 6 TB.
I am happy to change from RAID to XRAID before I do the veryical upgrade but would be happy if somebody could confirm the XRAID calculation and tell me how this is calculated ?
many thanks,
Hans
2x4TB+2x2TB will give you 8 TB of volume space with xraid.
The rule is to take away the largest disk and sum the rest. That is 4TB + 2 TB + 2 TB = 8 TB.
Technically this uses two raid layers- 4x2TB RAID-5 and 2x2TB RAID-1 for the vertical expansion. These are mounted as a single volume, but you can see the layers if you look at the disk partitioning with ssh,
With standard RAID-5, there is no layering like this. So only 2 TB of the two 4 TB drives can be used, which would give you 6 TB volume space.
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2x4TB+2x2TB will give you 8 TB of volume space with xraid.
The rule is to take away the largest disk and sum the rest. That is 4TB + 2 TB + 2 TB = 8 TB.
Technically this uses two raid layers- 4x2TB RAID-5 and 2x2TB RAID-1 for the vertical expansion. These are mounted as a single volume, but you can see the layers if you look at the disk partitioning with ssh,
With standard RAID-5, there is no layering like this. So only 2 TB of the two 4 TB drives can be used, which would give you 6 TB volume space.
- That sounds logical. Excellent. Those guys who developed XRAID did a great job.
Many thanks for your quick response. I am impressed.đ
Cheers,
Hans
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