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Purchased 12TB ReadyNas 214, only seeing 8TB available.
I purchased the 12TB model of NETGEAR ReadyNAS 214, 4x3TB Desktop (RN214D43-100NES) on Amazon, but I only appear to be getting 8TB, and I'm wondering if they sent me the wrong model?
See "data 8.17 free of 8.17"
In "Volumes", the display on the right indicates I DO have 4x3TB (which should = 12TB), but the display on the left still shows only 8.17 TB available. Is this a result of RAID 5 and all is normal? Or is something wrong? Where are are my other 4TBs?
I'm on a Macbook using OS X Yosemite 10.10.5, and firmware 6.4.1.
Thanks in advance for any help!
Parker
You are running RAID-5 (which has single disk redundancy). Providing that redundancy on your disk configuration requires 1/4 of the space to be used for RAID parity blocks. That brings you down to 9 TB (12 TB * 0.75). The general rule for XRAID single redundancy is "sum the drives and subtract the largest".
However, another factor is that NAS reports TiB, not TB. 1 TiB = 1024*1024*1024*1024 bytes. 1 TB is 1000*1000*1000*1000 bytes.
The forumula to converting 9 TB to TiB units is 9*(1000/1024)*(1000/1024)*(1000/1024)*(1000/1024) = 8.18 TiB.
You lose a little bit to the OS partition, so your voiume size is exactly right.
1 Reply
You are running RAID-5 (which has single disk redundancy). Providing that redundancy on your disk configuration requires 1/4 of the space to be used for RAID parity blocks. That brings you down to 9 TB (12 TB * 0.75). The general rule for XRAID single redundancy is "sum the drives and subtract the largest".
However, another factor is that NAS reports TiB, not TB. 1 TiB = 1024*1024*1024*1024 bytes. 1 TB is 1000*1000*1000*1000 bytes.
The forumula to converting 9 TB to TiB units is 9*(1000/1024)*(1000/1024)*(1000/1024)*(1000/1024) = 8.18 TiB.
You lose a little bit to the OS partition, so your voiume size is exactly right.
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