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ReadyNAS Model RN10400 Supposed to be 16TB but finished at 10.90 TB
Hi,
I recently finished setting up this Ready NAS RN 10400 with 4 x 4 TB WD Red hard drives. I was supposed to end up with close to 16 TB of space but ended up with only 10.90 TB of space?
Please tell me what is the possible reason for this?
Thank you.
Ben
We use base 2 like most computers whereas disk manufacturers use base 10.
e.g. 1 KB (base 10) = 1000 Bytes. 1 KiB (base 2) = 1024 Bytes
1 TB (base 10) = 1000 ^ 4 Bytes. 1 TiB (base 10) = 1024 ^ 4 Bytes
Like most computers do, we call KiB, KB and call TiB, TB. This is a bit confusing but it is the way things are done. It's the same amount of space just measured differently. Similarly the distance you travel whether it's in kilometres or miles is still the same but you get a different number.
So 4 x 4TB (base 10) volume in RAID-5 would give 12TB (base 10) as with RAID-5 the capacity of the largest disk is used for redundancy (to provide some protection against a single disk failure).
12TB = 12 / 1024 ^ 4 * 1000 ^ 4 = 10.91 TiB.
Allowing for things like the 4GB root volume, the 512MB swap partition and overheads 10.90 TB is pretty good.
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We use base 2 like most computers whereas disk manufacturers use base 10.
e.g. 1 KB (base 10) = 1000 Bytes. 1 KiB (base 2) = 1024 Bytes
1 TB (base 10) = 1000 ^ 4 Bytes. 1 TiB (base 10) = 1024 ^ 4 Bytes
Like most computers do, we call KiB, KB and call TiB, TB. This is a bit confusing but it is the way things are done. It's the same amount of space just measured differently. Similarly the distance you travel whether it's in kilometres or miles is still the same but you get a different number.
So 4 x 4TB (base 10) volume in RAID-5 would give 12TB (base 10) as with RAID-5 the capacity of the largest disk is used for redundancy (to provide some protection against a single disk failure).
12TB = 12 / 1024 ^ 4 * 1000 ^ 4 = 10.91 TiB.
Allowing for things like the 4GB root volume, the 512MB swap partition and overheads 10.90 TB is pretty good.Hi mdgm,
I see now, thanks a lot for taking the time to explain it to me.
Regards,
Ben
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