Difference between RAIDs (job, basic, raid0, raid1, raid5, raid6, shr, raid10, raid50, raid60)

You need to choose between reliability and speed.

Basic – is as fast as a single drive

JBOD – also as fast as a single drive

RAID0 – as fast as all drives speed combined

RAID1 – write as fast as one disk, reading as fast as all drives combined

SHR1 + RAID5  – write as fast as all drives (minus 1), read as fast as all drives combined (minus CPU calculations )

SHR2 + RAID6 – write as fast as all drives (minus 2), read as fast as all drives combined (minus CPU calculations )

RAID10 – combined two RAID1 blocks speed. faster than a RAID6 and still have the same redundancy. (probably fastest + safest option for a 2 bay)

RAID50- faster than RAID5 and have 2 disk redundancy

RAID60 – faster than RAID6 with 4 drive redundancy

If you have a 2 bay NAS you will have options like :

Basic– each drive will exist on its own. If you have 2x – you will see two disks/volumes. Every drive is on its own – if it fails, you lose data on that disk. Others are safe. (do a backup)

JBOD – all hard drives will be merged together under one big drive/volume. In the background, data will be written on the first disk first. And then when it is full, data then will be written on a disk 2 and so on. If it fails, you lose data on that disk. You can recover other disks (do a backup)

RAID0 – All disks are merged into one disk/volume. Data will be distributed equally across all drives. So half data on one disk and another half on another disk. If it fails, you lose data on all disks (do a backup)

RAID1 – All disks are merged into one disk/volume. Data on each drive will be mirrored/duplicated. If one drive fails, you have a copy on another drive.

SHR1 – (Similar to RAID5) All disks are merged into one disk/volume. Data will be written across all drives. Each drive will have a reserved storage block keeping data about other disks (size of 1 disk will be reserved and unavailable for use). If one drive fails, you have a copy of the data stored across the remaining drives. You can also mix two different size drives (more popular on 4+ bays or via expansion). If two drives fail – you lose data.

On three or more bays NAS (or 2bay with expansion) you will see additional options:

SHR2 – (Similar to RAID6) All disks are merged into one disk/volume. Data will be written across all drives. Each drive will have a reserved storage block keeping data about other disks (size of 2 disks will be reserved and unavailable for use). If two drives fail, you have a copy of the data stored across the remaining drives. You can also mix two different size drives (more popular on 4+ bays or via expansion). If three drives fail – you lose data.

RAID5 – All disks are merged into one disk/volume. Data will be written across all drives. Each drive will have a reserved storage block keeping data about other disks (size of 1 disk will be reserved and unavailable for use). If one drive fails, you have a copy of the data stored across the remaining drives.  If two drives fail – you lose data.

RAID6 -All disks are merged into one disk/volume. Data will be written across all drives. Each drive will have a reserved storage block keeping data about other disks (size of 2 disks will be reserved and unavailable for use). If two drives fail, you have a copy of the data stored across the remaining drives.  If three drives fail – you lose data.

RAID10 – (two blocks of RAID1)

RAID50 – (two blocks of RAID5 merged under RAID0)

RAID60 – (two blocks of RAID6 merged under RAID0)

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