Product : HPE, VSA [SDS]/12.7, x86
Feature : Disk Failure Protection, Reads/Writes, Data Availability
Content Owner:  Herman Rutten
Summary
Software RAID (10, 5 or 6)
+ opt. Hardware RAID (1+0, 5 or 6)
Details
By default StoreVirtual VSA uses Network RAID 10 (=striped mirroring) to protect volumes across multiple hosts in a storage cluster. Using Network RAID 10+X, up to four copies of a volume (1-3 Replicas) can be created within a storage cluster.

In slightly larger StoreVirtual VSA cluster configurations, Network RAID 5 (=single parity;≥3 nodes) or 6 (=dual parity; ≥5 nodes) can also be used for data protection.

For most production environments, HPE recommends using Network RAID 10, which stores two copies of the data on the cluster. With this setting, the volumes remain online if you lose any single node in the cluster. From a capacity standpoint, you would need to take your capacity estimate based on your assessment of the applications and workloads above and multiply it by the number of copies you want. For Network RAID 10, this is a factor of two, because you store two copies of the data on this volume.

Hardware RAID 1+0, RAID 5 or RAID 6 can be used to ensure availability within the node at the disk level.