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Chapter 8 Storage
Media Server User’s Guide
172
RAID 0
RAID 0 spreads data evenly across two or more disks (data striping) with no mirroring nor parity for
data redundancy, so if one disk fails the entire volume will be lost. The major benefit of RAID 0 is
performance. The following figure shows two disks in a single RAID 0 volume. Data can be written
and read across disks simultaneously for faster performance.
RAID 0 capacity is the size of the smallest disk multiplied by the number of disks you have
configured at RAID 0 on the NSA. For example, if you have two disks of sizes 100 GB and 200 GB
respectively in a RAID 0 volume, then the maximum capacity is 200 GB (2 * 100 GB, the smallest
disk size) and the remaining space (100 GB) is unused.
Typical applications for RAID 0 are non-critical data (or data that changes infrequently and is
backed up regularly) requiring high write speed such as audio, video, graphics, games and so on.
RAID 1
RAID 1 creates an exact copy (or mirror) of a set of data on another disk. This is useful when data
backup is more important than data capacity. The following figure shows two disks in a single RAID
1 volume with mirrored data. Data is duplicated across two disks, so if one disk fails, there is still a
copy of the data.
As RAID 1 uses mirroring and duplexing, a RAID 1 volume needs an even number of disks (two or
four for the NSA).
RAID 1 capacity is limited to the size of the smallest disk in the RAID array. For example, if you
have two disks of sizes 150 GB and 200 GB respectively in one RAID 1 volume, then the maximum
capacity is 150 GB and the remaining space (50 GB) is unused.
Table 29 RAID 0
A1 A2
A3 A4
A5 A6
A7 A8
DISK 1 DISK 2
Table 30 RAID 1
A1 A1
A2 A2
A3 A3
A4 A4
DISK 1 DISK 2