I currently have a 4 node stretch cluster with two "share nothing" physical DAS SAN in hyper-v 2016 (2 nodes and 1 SAN on each "site"). Whilst this does work I am unhappy with write performance async or sync. Infrastructure is 10G between "sites" with a pair of nodes in each site. Performance is much lower than expected when replication is active.
SANS are MD3220 and MD3200 with raid1 SSD for logs and raid 10 900GB 10k SAS as data. 400Gb available as LOG and 4Tb available as DATA . Connection is DAS via HBA SAS to each pair of nodes (iSCSI is not available on the SAN). Nodes are dell R630 dual 8c with 256Gb RAM. 10Gb interconnects with redundant 10G and 1G fibre heartbeats. Physical Quorum in a third building. Since this is a stretch cluster, primary site SAN can die and secondary SAN takes over redirected. Primary nodes can fail and secondary nodes take over etc. VM Workload is able to be run on a single node if necessary but is usually spread 50/50 over the two primary site nodes. Secondary site is there purely as high availability.
Can I replicate the above with starwind as a vSAN layer on top of the SAN? Basically I am looking to replace microsoft storage replication with starwind (v)SAN replication on the grounds that starwind will be faster. However, since this is a stretch cluster I was unsure if starwind works this way as a "share nothing" approach.
This is my "thinking": I could present both SAN to starwind - a pair of nodes connected to primary SAN via HBA SAS and a single node connected to a secondary SAN via HBA SAS - (8Tb + 800Gb total capacity spread over 2x SANs) then have all 3 nodes see a vSAN 4Tb with Starwind looking after the SAN replication (and using SSD as cache etc). Of course, 2 of the nodes will see the primary SAN and the 3rd node (4th when I spend money!) will see the secondary SAN. If the primary SAN dies (or both primary nodes that are connected to the primary SAN), starwind would still have the secondary SAN with all the data. The vSAN would be presented as a cluster share drive to all 3 nodes in the cluster.
Is this possible?
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