We continue to encounter many ESX environments where performance is an issue. A majority of the time, the culprit is disk IO. I would like to cover a few challenges in the following BLOG series ESX PERFORMANCE.
A challenge to disk performance is SCSI reservations. SCSI reservations are an essential part of ESX. Understanding their use, combined with other ESX locking mechanisms, will help ESX administrators prevent catastrophic outages or performance degradation.