EBS RAID Options

EBS RAID Options¶

EBS is already [[redundant storage]] (replicated within AZ)
But what if you want to increase [[IOPS]] to say 100 000 [[IOPS]]?
What if you want to mirror your EBS volumes?
You would mount volumes in parallel in [[RAID settings]].
RAID is possible as long as your OS supports it
Some RAID options are:
- [[RAID 0]]
- [[RAID 1]]
- [[RAID 5]] (not recommended for EBS - see documentation)
- [[RAID 6]] (not recommended for EBS - see documentation)

Combining 2 or more volumes and getting the total disk space and I/O
But one disk fails, all the data fails
Use cases would be:
- An application that needs a lot of IOPS and doesn't need fault-tolerance
- A database that has replication already built-in
Using this, we can have a very big disk wih a lot of [[IOPS]]
For example:
- two 500 GiB Amazon EBS IO volumes with 4,000 priovisioned IOPS each will create a 1000 GiB RAID 0 array with an available bandwith of 8,000 IOPS and 1,000 MB/s of throughput

RAID 1 = Mirroring a volume to another
If one disk fails, our logical volume is still working
We have to send the data to two EBS volumes at the same time (2x network)
Use case:
- Application that needs increased fault tolerance
- Application where you need to service disks
For example:
- Two 500 GiB Amazon EBS IOI volumes with 4,000 provisioned IOPS each will create a 500 GiB RAID 1 array with an available bandwidth of 4,000 IOPS and 500 MB/s of throughput.