You need to know the virtual machine and host UUIDs. The smallest virtual machine (10GB or less) takes less than 1 minute. The time required varies depending on the amount of data written to the disk since the last snapshot. This command will temporarily suspend the operation of the virtual machine (unless it has been shut down), start the recycling process, and then resume the operation of the virtual machine. Run the following command in XenServer CLI:įor example, if the UUID of the virtual machine is 2a8d2815-c97e-245b-efe2-389ba456bd7p, you need to run the following command:Ĭoalesce-leaf – u 2a8d2815-c97e-245b-efe2-389ba456bd7p The UUID is displayed in the general item. In the resource pane, select the virtual machine corresponding to the required UUID. In XenCenter, enable hidden objects (View Menu > hidden objects). You must know the UUID of the virtual machine. SJ recommends backing up the virtual machine that will run the space recycling tool, which can be backed up using the XenCenter export option. Step - for XenServer 5.5 update 1 and higher versions Virtual machines with disks of these two storage types cannot be merged. ? All virtual machine disks must be on shared storage or local storage of a single host. Otherwise, the script will fail, the tool will display an error message, and then exit.
? Before running this tool, you must use XenCenter or XenServer CLI to delete all snapshots and clones related to the virtual machine. ? Running this script will make the virtual machine temporarily unavailable because of the pause/resume operation. The following describes the offline merge tool and its use.
This tool recovers all disk space previously allocated to deleted snapshots or clones when the virtual machine is temporarily shut down or suspended (offline). To eliminate this limitation, XenServer 5.5 update 1 and later introduced an offline merge tool. Although the deleted snapshot or clone virtual machine of NFS and ext based SR consumes very little space, the amount of space consumed is very large for iSCSI FC and local Sr.
After you delete all snapshots or clone virtual machines on virtual machine disks, some disk space may still be allocated. However, the consolidated deployment of XenServer 5.5 has a known limitation. XenServer can merge disk space while the virtual machine is running (that is, online merging). Background InformationĪfter deleting snapshots or cloning virtual machines on LVM based local ext and NFS Sr, XenServer can automatically recover disk space by freeing unused data. This article describes how to recover disk space using the offline coalesce tool after deleting a snapshot or cloning a virtual machine.
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