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Flexraid Calculator
I am trying to understand the usable space with the flexraid format amongst disks of different capacities. The online calculator is missing certain disks like 5TB and 650TB, etc. Any documentation ...
Blanker-2 wrote:
Any documentation I may have missed?
The software manual ( http://www.downloads.netgear.com/files/GDC/READYNAS-100/READYNAS_OS_6_SM_EN.pdf ) does talk about FlexRaid expansion - see pages 35-36.
Blanker-2 wrote:
It seems as though the flexraid format needs to have disks of the same size. So a flexraid (RAID5) array of two 2TB diks and two 5TB disks will yeild a usable volume of 6TB (esentially wasting 3TB of each 5TB disk, and reserving one 2TB disk for redundancy)?
That is what the manual says. One small correction - the parity blocks that create redundancy are evenly spread across all the disks. But that change your capacity assessment. Anyway, you understand the underlying principle, so you can compute capacity w/o the calculator.
There could be some special cases where unequal disks can be used - I think jak0lantash posted the results of a lot of expansion experiments he did some months ago.
With that particular combination of disks, you get 7 TB by creating a 2x2TB RAID-1 volume and a 2x5TB RAID-1 volume. X-RAID of course gives you 9 TB. The rule for X-RAID single redundancy is "sum the disks and subtract the largest".
Blanker-2 wrote:
Any documentation I may have missed?
The software manual ( http://www.downloads.netgear.com/files/GDC/READYNAS-100/READYNAS_OS_6_SM_EN.pdf ) does talk about FlexRaid expansion - see pages 35-36.
Blanker-2 wrote:
It seems as though the flexraid format needs to have disks of the same size. So a flexraid (RAID5) array of two 2TB diks and two 5TB disks will yeild a usable volume of 6TB (esentially wasting 3TB of each 5TB disk, and reserving one 2TB disk for redundancy)?
That is what the manual says. One small correction - the parity blocks that create redundancy are evenly spread across all the disks. But that change your capacity assessment. Anyway, you understand the underlying principle, so you can compute capacity w/o the calculator.
There could be some special cases where unequal disks can be used - I think jak0lantash posted the results of a lot of expansion experiments he did some months ago.
With that particular combination of disks, you get 7 TB by creating a 2x2TB RAID-1 volume and a 2x5TB RAID-1 volume. X-RAID of course gives you 9 TB. The rule for X-RAID single redundancy is "sum the disks and subtract the largest".
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