Raid Errors

Raid State:

The Raid state is calculated by d (>) or (=) or (<) n-1.
D (disks/drives): Number of active/working disks.
T: Total HDD's in the raid
Example a Raid 5 with 5 HDDs and only 3 are working with 1 hot spare. (D=3; T=5)
3<5-1 Raid is InActive and data is lost

Active: Raid is in operating condition.

• The state is calculated by: "D>T-1"

Degraded: HDD has degraded or no longer operating.

• The state is calculated by: "D=T-1"

InActive: Raid is corrupt and data is lost.

• The state is calculated by: "D<T-1"

Active, Degraded*: This means one of the HDDs has an issue. Depending on the extent of the issue the hot spare will replace the HDD with issues. In the event no Hotspare is available should another HDD fail the RAID5 will fail and become InActive and data will be rendered unrecoverable.

Active, Degraded, Recovering*: The raid is being rebuilt/rebuilding a disk. In the event, another HDD fails while in this state data will be lost and RAID state will change to inactive.

*During the Degraded status if HDD space is 0/0 GB but it is still Active the RAID is still operating but it is rebuilding itself. While the RAID is being rebuilt the system can not save the new video to the RAID.

HDD Status in Raid:

Sync: Indicates all the disks are currently in sync or are synchronizing.

• In this state, the HDDs are operating correctly.

Rebuilding Disk: The data on HDD x is being rebuilt by calculating data from the other available HDD

• The data has been lost/corrupt or HDD Hot Spare due to failed HDD. No HDDs can be removed or changed during this time period otherwise will risk the loss of the entire raid.