![]() RAID 5 or RAID 6 (erasure coding) with six fault domains RAID 5 or RAID 6 (erasure coding) with four fault domains The following table shows a general comparison between RAID 1 and RAID 5 or RAID 6. For example, a VM protected by a Primary level of failures to tolerate value of 1 with RAID 1 requires twice the virtual disk size, but with RAID 5 it requires 1.33 times the virtual disk size. RAID 5 or RAID 6 erasure coding requires less additional capacity to protect your data than RAID 1 mirroring. You can configure RAID 5 or RAID 6 on all-flash clusters with six or more fault domains. You can configure RAID 5 on all-flash clusters with four or more fault domains. RAID 5 or RAID 6 erasure coding enables vSAN to tolerate the failure of up to two capacity devices in the datastore. Erasure coding can provide the same level of data protection as mirroring (RAID 1), while using less storage capacity. You can use RAID 5 or RAID 6 erasure coding to protect against data loss and increase storage efficiency. To Learn More on RAID Levels, Check STANDARD RAID LEVELS RAID-6 – 4+2 configuration, 4 data fragments, 1 parity and 1 additional syndrome per stripe. RAID-5 – 3+1 configuration, 3 data fragments and 1 parity fragment per stripe. RAID-5 and RAID-6 are fully supported with the new deduplication and compression mechanisms in vSAN. Here there is no dedicated disk allocated or storing the parity, it uses distributed parity. Data blocks are placing across the storage on each host along with a parity. For RAID-5, a minimum of 4 hosts and for RAID-6 a minimum of 6. To configure RAID-5 or RAID-6 on VSAN has specific requirement on the number of hosts in vSAN Cluster. They are available only for all-flash vSAN Cluster, and you cannot use it on hybrid configuration. RAID 5 or RAID 6 erasure coding is a policy attribute that you can apply to virtual machine components. This feature is also termed “erasure coding”. RAID-5 and RAID-6 are introduced in vSAN to reduce the overhead when configuring virtual machines to tolerate failures. Any such scheme is refer to as an “erasure code”, this clarified from VMware Blog. what is “Erasure Coding”, Erasure Coding is a general term that refers to *any* scheme of encoding and partitioning data into fragments in a way that allows you to recover the original data even if some fragments are missing. First when you hear the term “Erasure Coding”, confused?, Let’s clarify this.
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