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Total Capacity available on ReadyNas 214 with 4 x WD Red 5TB HDD
Hello all
Can someone please confirm something for me?
I have a ReadyNas 214 that currently has a single WD Red 5TB HDD in it which gives me a total of 4.54TB available.
Am I correct in believing that when fully populated with 4 x WD Red 5TB HDD that I will have a total of 14.54TB available taking into account one of the HDD being used for Parity?
The system will be configured for X-RAID2.
Thanks in advance
Kevin
The NAS reports TiB (1024*1024*1024*1024 bytes per TiB), drive manufacturers use TB (1000*1000*1000*1000 bytes per TB).
5 TB is the same as 4.55 TiB. (The NAS is taking about 4 GB for the OS and swap, but that is in the third decimal place when you scale up to TB.)
With 4x5 TB you'd have a 15 TB volume. That is the same as 13.6 TiB - the formula is 15*(1000/1024)*(1000/1024)*(1000/1024)*(1000/1024)
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Netgear have an online calculator: RAID Calculator
but they don't have 5TB drives listed. Essentially your statement is correct, 3x drives for data and 1x drive for parity, so if all drives are the same size, then you have 3x the drive size.
The rule for single redundancy is sum the drives and subtract the largest.
The "one drive for parity" idea is perhaps misleading. The parity blocks are evenly spread over all the drives in newer ReadyNAS. Only the 4.1.x systems have a dedicated parity disk.
Thanks for the clarification (on both points).
The NAS reports TiB (1024*1024*1024*1024 bytes per TiB), drive manufacturers use TB (1000*1000*1000*1000 bytes per TB).
5 TB is the same as 4.55 TiB. (The NAS is taking about 4 GB for the OS and swap, but that is in the third decimal place when you scale up to TB.)
With 4x5 TB you'd have a 15 TB volume. That is the same as 13.6 TiB - the formula is 15*(1000/1024)*(1000/1024)*(1000/1024)*(1000/1024)
Hello Stephen
Thanks for the information, much appreciated.
Kevin
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