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free space less than expected...
Quick question about drive space....(Readynas 314)
I have qty 2 - 3tb drives and I am in the process of setting them up as RAID 1. Its gonna take 7 hours (argh!!) for this volume to be created but right now its reporting that 2.65tb of free space will be available. Why am I loosing about 375gb of space on a mirror??? I'm concerned because after this I am going to be setting up a second mirror in bays 3 & 4, the same thing qty 2 - 3tb drives RAID 1. This means when all is said and done I will have lost 750gb in drive space which is a lot considering I'm already using a RAID level which is costly in regards to disk utilization.
Do you think I may see a different reported "free space" when the rebuild is complete??
I have qty 2 - 3tb drives and I am in the process of setting them up as RAID 1. Its gonna take 7 hours (argh!!) for this volume to be created but right now its reporting that 2.65tb of free space will be available. Why am I loosing about 375gb of space on a mirror??? I'm concerned because after this I am going to be setting up a second mirror in bays 3 & 4, the same thing qty 2 - 3tb drives RAID 1. This means when all is said and done I will have lost 750gb in drive space which is a lot considering I'm already using a RAID level which is costly in regards to disk utilization.
Do you think I may see a different reported "free space" when the rebuild is complete??
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- Drive manufacturers use a different base for measurements. Using base 10 drive manufacturers have 1KB=1000 Bytes, 1MB = 1000 KB etc.
Whereas the NAS considers 1KB = 1024 Bytes, 1MB = 1024 KB.
It's the same amount of space, just a different way of measuring it (much like measuring distance in miles vs kilometres). Just like you'd find with say a 500GB disk in a PC you would see it reported as having perhaps about 465GB in capacity though as you are dealing with larger and larger volumes it becomes more noticeable due to the compounding.
So 3TB (base 10) = 3 / 1024^4 * 1000 ^ 4 = 2.73 TB (base 2)
Allowing for overheads 2.65TB is very reasonable.
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