Xenserver 5.5 update 1 released

December 28, 2009

Some days ago Citrix released the first update for Xenserver 5.5.

This update resolves a number of functional and stability issues (about XenCenter, Storage, Active Directory and General System Improvements) that were present in the XenServer 5.5 release, and it includes all the previous XS 5.5 public hotfixes. But the most important enhancement was about a well-known bug in the snapshot mechanism of Xenserver 5.5.

When LVHD snapshots are deleted, disk space is reclaimed by freeing unused snapshot data. This is provided automatically by XenServer while VMs continue to run. However, there is a known limitation in the 5.5 implementation of this feature: when all snapshots are deleted for a given VM’s disks, some disk space allocated to these snapshots may remain. To address this limitation, Update 1 includes an ‘Off-line Coalesce’ tool that can reclaim all disk space previously allocated to deleted snapshots while the VM is temporarily set offline. The Off-line Coalesce tool and its use are described in full in an associated KB article: CTX123400
This enhancement could be very useful if you are using the snapshot mechanism in order to backup your VMs.

As you can see here , this update needs a reboot for all the servers of your pool, but it also requires the update of XenTools on all VMs.

Pay attention if you have some VM with IPv6 enabled!! Citrix published this article saying that XenServer 5.5 Update 1 Upgrade could cause Virtual Machines to lose network connectivity if they have both IPv4 and IPv6 enabled (Vista and 2008 VMs for example).

So consider this before upgrading; Citrix is working for an update to resolve the IPv6 issues cited above. It will be available for all XenServer 5.5 and XenServer 5.5 Update 1 installations in January 2010.


One comment

  1. […] Windows 7 and 2008 VM with IPV6 enabled (this VM loose network connectivity), as you can read in this my previous post. Update 2 contains all previous fix (Update 1 has made many improvements, from LVH Snapshots space […]

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