A new patch just went out from VMware for its mainstream product.
This patch fixes just one bug:
This patch fixes a timing issue in the LSI Logic MegaRAID driver shipped with ESX 2.5.x. This issue causes ESX Server systems using LSI Logic MegaRAID controllers to become unresponsive when storage management agents are installed on the service console.
VMware has seen this problem on Dell non-blade systems when storage management agents are installed on the service console. However, the issue may also be triggered by other applications that communicate directly with internal MegaRAID firmware.
Donwload it here.