Ruslan Sivak wrote:
If you set up a third box to be the shared storage, doesn't that now become the single point of failure?
enterprise grade shared storage (SAN) is generally fully redundant. They use dual storage controllers, ideally in an active/active configuration. you use dual fiber channel cards on each host, going to two seperate FC switches, both switches go to both storage controllers. each drive bay has fiber loops to both controllers. fiberchannel drives have dual ports so both controllers can talk to them... Each storage chassis has redundant power, ideally wired to seperate UPS systems. This is all rather expensive but there is no single point of failure. Combined with the fact that every component of this sort of SAN is engineered for very high uptime in the first place, you achieve 5 9's or better reliability.
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