every few weeks our vsphere 5 server goes on the run.
all applications time out, vsphere client shows that disk latencies on all services go sky-high (see screenshot).
my only solution is a reboot of the physical server and restart each virtual server.
unix servers usually need a fsck in single user mode to get rid of errors.
what could be cause of these extreme latencies ?
we use vsphere 5 on a raid-5 of 6 x 500gb local sata disks.