The following procedure assumes that you have a working IPA configuration and that the IPA domain is already joined to the Engine. You must also ensure that the clocks on the Engine, the virtual machine and the system on which IPA (IdM) is hosted are synchronized using NTP.
Volume Lock 2.2 Keygen
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If vdagent is not running on the client machine, the mouse can become captured in a virtual machine window if it is used inside a virtual machine and the virtual machine is not in full screen. To unlock the mouse, press Shift + F12.
If the disk was created as block storage, for example iSCSI, and the Wipe After Delete check box was selected when creating the disk, you can view the log file on the host to confirm that the data has been wiped after permanently removing the disk. See Settings to Wipe Virtual Disks After Deletion in the Administration Guide.
If the disk was created as block storage, for example iSCSI, and the Discard After Delete check box was selected on the storage domain before the disk was removed, a blkdiscard command is called on the logical volume when it is removed and the underlying storage is notified that the blocks are free. See Setting Discard After Delete for a Storage Domain in the Administration Guide. A blkdiscard is also called on the logical volume when a virtual disk is removed if the virtual disk is attached to at least one virtual machine with the Enable Discard check box selected.
Collapse Snapshots: creates a single export volume per disk. This option removes snapshot restore points and includes the template in a template-based virtual machine, and removes any dependencies a virtual machine has on a template. For a virtual machine that is dependent on a template, either select this option, export the template with the virtual machine, or make sure the template exists in the destination data center.
Due to current limitations, Xen virtual machines with block devices do not appear in the Virtual Machines on Source list. They must be imported manually. See Importing Block Based Virtual Machine from Xen host.
With storage domains V4 or later, virtual machines have the additional capability to acquire a lease on a special volume on the storage, enabling a virtual machine to start on another host even if the original host loses power. The functionality also prevents the virtual machine from being started on two different hosts, which may lead to corruption of the virtual machine disks.
Virtualization poses various challenges for virtual machine time keeping. Virtual machines which use the Time Stamp Counter (TSC) as a clock source may suffer timing issues as some CPUs do not have a constant Time Stamp Counter. Virtual machines running without accurate timekeeping can have serious affects on some networked applications as your virtual machine will run faster or slower than the actual time.
Lock screen - This is the default option. For all Linux machines and for Windows desktops this locks the currently active user session. For Windows servers, this locks the desktop and the currently active user.
Select the storage domain to hold a virtual machine lease, or select No VM Lease to disable the functionality. When a storage domain is selected, it will hold a virtual machine lease on a special volume that allows the virtual machine to be started on another host if the original host loses power or becomes unresponsive.
Most applications will run better in an active/passive configuration, as they are not designed or optimized to run concurrently with other instances. Choosing to run an application that is not cluster-aware on shared logical volumes may result in degraded performance. This is because there is cluster communication overhead for the logical volumes themselves in these instances. A cluster-aware application must be able to achieve performance gains above the performance losses introduced by cluster file systems and cluster-aware logical volumes. This is achievable for some applications and workloads more easily than others. Determining what the requirements of the cluster are and whether the extra effort toward optimizing for an active/active cluster will pay dividends is the way to choose between the two LVM variants. Most users will achieve the best HA results from using HA-LVM.
HA-LVM and shared logical volumes using lvmlockd are similar in the fact that they prevent corruption of LVM metadata and its logical volumes, which could otherwise occur if multiple machines are allowed to make overlapping changes. HA-LVM imposes the restriction that a logical volume can only be activated exclusively; that is, active on only one machine at a time. This means that only local (non-clustered) implementations of the storage drivers are used. Avoiding the cluster coordination overhead in this way increases performance. A shared volume using lvmlockd does not impose these restrictions and a user is free to activate a logical volume on all machines in a cluster; this forces the use of cluster-aware storage drivers, which allow for cluster-aware file systems and applications to be put on top.
If an LVM volume group used by a Pacemaker cluster contains one or more physical volumes that reside on remote block storage, such as an iSCSI target, Red Hat recommends that you configure a systemd resource-agents-deps target and a systemd drop-in unit for the target to ensure that the service starts before Pacemaker starts. For information on configuring a systemd resource-agents-deps target, see Configuring startup order for resource dependencies not managed by Pacemaker.
The following procedure creates an LVM logical volume and then creates an ext4 file system on that volume for use in a Pacemaker cluster. In this example, the shared partition /dev/sdb1 is used to store the LVM physical volume from which the LVM logical volume will be created.
If your LVM volume group contains one or more physical volumes that reside on remote block storage, such as an iSCSI target, Red Hat recommends that you ensure that the service starts before Pacemaker starts. For information on configuring startup order for a remote physical volume used by a Pacemaker cluster, see Configuring startup order for resource dependencies not managed by Pacemaker.
For RHEL 8.5 and later, you can disable autoactivation for a volume group when you create the volume group by specifying the --setautoactivation n flag for the vgcreate command, as described in Configuring an LVM volume with an ext4 file system in a Pacemaker cluster.
This procedure modifies the auto_activation_volume_list entry in the /etc/lvm/lvm.conf configuration file. The auto_activation_volume_list entry is used to limit autoactivation to specific logical volumes. Setting auto_activation_volume_list to an empty list disables autoactivation entirely.
Do not configure more than one LVM-activate resource that uses the same LVM volume group in an active/passive HA configuration, as this could cause data corruption. Additionally, do not configure an LVM-activate resource as a clone resource in an active/passive HA configuration.
Do not configure more than one LVM-activate resource that uses the same LVM volume group in an active/passive HA configuration, as this risks data corruption. Additionally, do not configure an LVM-activate resource as a clone resource in an active/passive HA configuration.
In Red Hat Enterprise Linux 8, LVM uses the LVM lock daemon lvmlockd instead of clvmd for managing shared storage devices in an active/active cluster. This requires that you configure the logical volumes that your active/active cluster will require as shared logical volumes. Additionally, this requires that you use the LVM-activate resource to manage an LVM volume and that you use the lvmlockd resource agent to manage the lvmlockd daemon. See Configuring a GFS2 file system in a cluster for a full procedure for configuring a Pacemaker cluster that includes GFS2 file systems using shared logical volumes. 2ff7e9595c
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