Rocstor ARCTICROC 4T User Manual download pdf (Page 22)

ARCTICROC 4T – 4Bay RAID System - User Manual Page | 22

RAID 1 (Mirroring)

RAID 1 (Mirroring) consists of at least two drives storing duplicate copies of the same data. In

this mode, the data is simultaneously written to two disks. Thus, the storage capacity of a two-

disk array is combined into a single disk and the capacity is limited to the size of the smallest

disk. The speed of operation is very slow in comparison to other RAID modes.

During rebuild, the first HDD inserted into one of the HDD slots is recognized by the RAID

System as the source HDD. To rebuild existing data from a source HDD to a backup HDD (target

HDD), the source HDD must first be inserted into one of the HDD slots. After the host detects

the source HDD, the target HDD should then be inserted in one of the other HDD slot. The RAID

System will then recognize the target HDD and the rebuild process will begin when the HDD LED

starts blinking.

In Mirroring mode, only 2 HDDs are allowed for the function to perform properly.

There is no limitation on the order of insertion or the slot number. However, if all 4

HDDs are inserted, the RAID System can only do Mirroring in the HDDs positioned in

HDD 1 and HDD 2. It is not possible to process two sets of HDDs at the same time.

RAID 1

Disk 1

Disk 2

In Mirroring mode, if one of the disks fails, either source or backup, the data is still

available. However, if the source disk fails during the rebuild process, the data in both

disks will be lost.

It is NOT recommended to do Hot Swap for the source disk during the rebuild process

because the data in both disks will be lost.

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Rocstor ARCTICROC 4T User Manual Page 22