We recently had a fibre channel storage issue (looks like it was a single bad cable) that affected all 360 VMs in 2 clusters attached to the same storage virtualisation device - IBM SVC 2145. The VMs were basically so slow to respond that they were unusable and many were logging symmpi errors in the Windows event logs.
VMware responded with the obvious - "storage issue" - but our storage team is adamant there was no problem with their equipment or zoning. I need to know how one single faulty cable could effectively bring down all VMs in 2 separate clusters.
Has anyone had a similar problem, or able to shed any light?
PS all hosts running vSphere update 1, with patches to December 2009.
Edit: Physical servers attached to the same SVD were apparently unaffected.