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ASUSTOR NAS User Guide

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configuration does not offer any type of data protection.

 JBOD: An acronym for “just a bunch of disks”, JBOD uses a combination of

two or more disks to create storage space. The total storage capacity is the

capacities of all the disks added together. The advantage of this

configuration is that it allows you to use different sized disks together and

provides a large amount of storage space. The downside is that it does not

offer any sort of data protection.

RAID Volume Types

 RAID 0: Uses a combination of two or more disks to create storage space.

The total storage capacity is the capacities of all the disks added together.

The advantage of this configuration is that it allows you to use different sized

disks together and provides a large amount of storage space. Also, data in

RAID 0 volumes is accessed in parallel which provides improved

performance. The downside is that RAID 0 does not offer any sort of data

protection.

 RAID 1: In RAID 1 your data is written identically on two disks, thereby

producing a “mirrored set”. Exactly the same data is stored on the two disks

at all times. RAID 1 protects your data from loss should one of your disks

fail. RAID 1’s advantage is that it offers protection for your data by providing

data redundancy. The downside of this configuration is that when combining

two disks of differing sizes, the total storage space will be equal to the size

of the smaller disk. Therefore, you will be unable to use a portion of the

larger disk.

Total available storage space = (size of smaller disk) * (1)

 RAID 5: Combines three or more disks to create a storage space that is able

to support one failed disk. Should one of your disks fail, your data will still

be protected from loss. In the event of disk failure, simply replace the failed

disk with a new one. The new disk will automatically be accommodated into

the RAID 5 configuration. The advantage of using RAID 5 is that is that it

provides data protection through data redundancy. The downside to using

RAID 5 is that when combining disks of differing sizes, the total storage

space will be calculated based on the size of the smallest disk.

Total available storage space = (size of smallest disk) * (total number of

disks – 1)

 RAID 6: Combines four of more disks to create a storage space that is able

to support two failed disks. Should two of your disks fail, your data will still

be protected from loss. In the event of disk failure, simply replace the failed

disks with new ones. The new disks will automatically be accommodated into

the RAID 6 configuration. The advantage of using RAID 6 is that it is able to

provide superior data protection through data redundancy. The downside to

using RAID 6 is that when combining disks of differing sizes, the total

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