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Forum Discussion
How to upgrade drive sizes
I have a ReadyNAS 104 with two 3TB drives. I am using X-RAID and the two drives are presented as a RAID-1 volume. If I buy two new drives to fill the 3rd and 4th bays am I right in assuming I will ...
(a) If you install a larger drive (say 4 TB) in slot 3, then 1 TB will be unused, and your volume size becomes 6 TB raid-5.
(b) if you install a second 4 TB drive in slot 4, then all the space will be used, and the volume becomes 10 TB. There are two layers of RAID in that case - a 4x3TB RAID-5 layer, and a 2x1TB RAID-1 layer to use the rest of the space. This is invisible to you, you only see the 10 TB volume.
The general rule with single redundancy xraid2 is that you don't waste any space as long as your 2 largest drives are the same size.
You can't install smaller drives than the largest you already have (though you can replace a failed drive with one of the same size).
(b) if you install a second 4 TB drive in slot 4, then all the space will be used, and the volume becomes 10 TB. There are two layers of RAID in that case - a 4x3TB RAID-5 layer, and a 2x1TB RAID-1 layer to use the rest of the space. This is invisible to you, you only see the 10 TB volume.
The general rule with single redundancy xraid2 is that you don't waste any space as long as your 2 largest drives are the same size.
You can't install smaller drives than the largest you already have (though you can replace a failed drive with one of the same size).
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