January 2018
Intermediate to advanced
574 pages
14h 44m
English
As mentioned earlier, SIOC enables communication between these local host schedulers so that I/O can be balanced between virtual machines running on separate hosts. It does so by maintaining a shared file in the datastore that all hosts can read/write/update. When SIOC is enabled on a datastore, it starts monitoring the device latency on the LUN backing the datastore. If the latency crosses the threshold, it throttles the LUN's queue depth on each of the ESXi hosts in an attempt to distribute a fair share of access to the LUN for all the virtual machines issuing the I/O.
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