at my Company we were experiencing some weird spikes on IO latency on one of our ESXi instances.
we've spend 24h figuring out whats wrong and no clue so far.
after giving up we put all the disks into a different server (HP DL380 G7) with much less RAM and only one 6(HT) cores (from 12 on the DL 580) which run fine for about 2 hours.
I dont know the specs for the DL380 but both servers have a Smart Array P410i with BBWC (the DL 580 has 1GB)
Is it possible that one(or all) of the disks is failing without actually failing?