This hotfix ( Hotfix XS55E001 – For XenServer 5.5 ) resolves an issue for customers that have upgraded their XenServer installation from 5.0 to 5.5, however it is recommended that all customers apply the hotfix.

If customers are unable to apply this hotfix, Citrix recommends that you use the workaround available at CTX122359 – Hotfix XS55E001 Fails to Install

Issue resolved in this hotfix
Customers that have upgraded a XenServer 5.0 installation to 5.5 with shared LVM storage and a pool of hosts may encounter an issue with live snapshotting of a VM on a slave. Once the snapshot has failed, the SR may become unusable for any new operations other than VM reboot, migrate, shutdown and start. This hotfix will unblock pools that are in this state, and will prevent the issue from occurring.

Installing the Hotfix
Use XenCenter or the CLI to install this hotfix. You must restart the server after installing the hotfix to ensure that it takes effect. As with any software update, back up your data before proceeding.

Always install the hotfix to the master of your pool first. If you do not do this, updated slaves cannot reconnect to the pool until the master has also been updated. Following the steps below once to upgrade the master, restarting the master, and then following the steps again for each of the slaves is best practice to ensure that the installation is completed in the correct order.

Installing the hotfix using XenCenter:
1. Download the update to a known location on a computer that has XenCenter installed.

2. In XenCenter, click on the Tools menu, and select the Install New Update.

3. Select the servers to update.
Citrix advises you to update the Pool master first by selecting only that host for upgrade initially, then re-running the update wizard for all the slaves afterwards. You are also advised to upgrade all hosts in a pool within a short space of time. Running a mixed pool of updated and non-updated hosts for general operation is not supported.

4. Click Next to proceed.

5. Enter the path or browse to your downloaded update file. Click Next and the update is uploaded to the pools and servers you chose to update.

6. Select an update mode.
Citrix strongly advises that you use Manual mode for this update. If you select Manual mode, the update will be applied on each server but you will be required to manually restart the servers for the update to take effect.

7. Click Next to proceed.

8. The system verifies that the update can be successfully applied.
This can take some time. The wizard then advances to a page showing the steps that will be taken to apply the update.

9. Click Next to install the update.
Please review the steps as they may include migration of VMs, or suspending them to disk for single hosts or cases where there is not enough free capacity in the pool, which causes service interruption.

10. Once the update has completed, click Finish to exit the wizard

Installing the update using the off-host CLI:
1. Download the update to a known location on a computer that has the XenServer CLI installed.

2. Upload the patch to the pool or host you wish to apply it to:

xe -s -u root -pw patch-upload file-name=

The update identifier is printed to the screen:
408347ae-c0fc-4b10-9dcd-cf640537421e
3. Apply the patch to the pool specifying the UUID of patch as given by the upload command in the previous step:

xe -s -u root -pw patch-pool-apply \ uuid=408347ae-c0fc-4b10-9dcd-cf640537421e
4. Restart the master of your pool and wait for it to finish booting.

5. Restart all remaining hosts in the pool to complete the patch installation.

Patch UUID:

408347ae-c0fc-4b10-9dcd-cf640537421e

MD5SUM:

fcb3de23196c62b57d6b1bf7db8c6fd9

To Read More Click Here