RAID Capacity Calculator1
| Raw available capacity | – |
| Available for storage | – |
| Used for redundancy | – |
Note that this setup results in a nested RAID. This means you're creating at least two RAID sets that sit within another. For example, RAID 10 means you have two RAID 1 sets that sit within a RAID 0, while RAID 50 means two RAID 5 sets within a RAID 0, and so on. This calculator assumes you are creating a typical setup with two subsets, though it would be possible to create more with enough disks.
For JBOD and JBOF, raw capacity is not a single "name space" or volume. Each drive is individual of each other and mounts as such. With Spanning, separate disks are "merged" into a single "logical" volume, so your system only mounts one volume. This is similar in capacity to RAID 0, although the data is not split across the drives. This means there is no performance boost. However, if a drive fails, only the data on that drive is lost rather than losing everything within the larger volume.
For JBOD and JBOF, raw capacity is not a single "name space" or volume. Each drive is individual of each other and mounts as such. With Spanning, separate disks are "merged" into a single "logical" volume, so your system only mounts one volume. This is similar in capacity to RAID 0, although the data is not split across the drives. This means there is no performance boost. However, if a drive fails, only the data on that drive is lost rather than losing everything within the larger volume.
1. This RAID Capacity Calculator is provided for illustrative purposes only. Capacity is calculated based on parameters selected in the tool. Please refer to individual device specifications to confirm RAID support, drive quantity allowed, and capacity support. 1GB = 1 billion bytes and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating environment.
2. To achieve optimal RAID capacity and performance, we advise using disks with the same capacity in your array. Using different-sized drives will result in wasted, unused space for the larger capacity drives. This does not apply for JBOD/JBOF setups since the drives function independently of each other.