There are two important hotfixes this week related to PVS and XS 5.6 FP1. These are in BOLD below.
Edgesight (This hotfix introduces event log upload throttling to the agent)
"User unable to select own domain in PVS console when creating a machine account"
BG-28082: Citrix PVS Soap Server crashes due to heap memory overrun.
BUG 27688 Upgrading a Citrix Provisioning Services 5.1.2 (w/hotfix CTX127164 or CTX126804) to Citrix Provisioning Services 5.6 Service Pack 1 will make all of the other Citrix Provisioning Services 5.1 SP2 Servers in the farm appear offline once the database is upgraded to 5.6 Service Pack 1.
BUG 27692 Upgrading a Citrix Provisioning Services 5.6 server to Citrix Provisioning Services 5.6 Service Pack 1 causes all the target devices to failover to the new 5.6 SP1 server.
This fix addresses a security vulnerability. For more information, see Knowledge Center article CTX123359
XenServer 5.6 FP1
05:48 3/10/2011, XS 5.6 FP1
Attached CDROM devices will disappear after a Windows Virtual Machine (VM) migration, which may result in severe performance degradation in the affected Windows VMs due to excess CPU utilization. Citrix recommends that customers apply this hotfix to resolve this issue.