We discovered that 3par's default configuration for multipath.conf would yield a 30 second I/O stall whenever we failed one of the paths.
Eventually we were able to get support to offer adding "dev_loss_tmo 1" to the multipath.conf as such:
defaults {
user_friendly_names yes
polling_interval 5
dev_loss_tmo 1
}
With that in place, we would only observe a 1 second I/O stall during a path failure.
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