NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
Solved
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 b...
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)
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).
NETGEAR Academy
Boost your skills with the Netgear Academy - Get trained, certified and stay ahead with the latest Netgear technology!
Join Us!
