Storage Issues

QEMU Direct LUN Disk Naming Changed in Virtual Machine After Upgrade

The QEMU naming convention for the direct LUNs changes after upgrading from 4.3.x to 4.4. This means that any applications or databases using those disks might not start up or will throw errors.

On 4.3.x, the disk names of the direct LUNs before the upgrade:

0QEMU_QEMU_HARDDISK_drive-ua_<UUID>

ON 4.4.10, the disk names of the direct LUNs after the upgrade to 4.4.10:

0QEMU_QEMU_HARDDISK_<UUID>

Solution: Manually change the udev rule, for example: 

KERNEL=="sd*", SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", /
ENV{ID_SERIAL}=="0QEMU_QEMU_HARDDISK_9f02f5ed-2787-41d6-899c-##########", /
SYMLINK+="mapper/ORDATA01", OWNER="grid", GROUP="asmadmin", MODE="0660", ENV{ASM_DISK}="RDATA01"

Bug: 35376968

Storage Must be on the Same Subnet as the KVM Hosts

In order to avoid issues with routing, storage must be located on the same subnet as the Oracle Linux KVM hosts that will use the storage.

Bug: 29220930

Decreasing the Storage Size Used in Storage Domains Is Not Recommended

Although the size of NFS Ext 3 and 4 filesystems can be decreased and Block Storage (iSCSI and Fibre Channel) provides the capability to decrease storage size by resizing the underlying LUN, decreasing the storage size that is used for a storage domain is potentially a dangerous operation and is highly not recommended.

Solution: Do not decrease the storage size used in storage domains in your virtualization environment.

Bug: 29285337

Manager Not Updating the Size of an iSCSI-Based Virtual Disk After ZFS Storage Resized

The Oracle Linux Virtualization Manager is not updating the size of an iSCSI-based virtual disk after the ZFS storage is resized. This issue is seen after creating an LUN, attaching the virtual disk to a running virtual machine, resizing the LUN, and restarting VDSM. After the refreshing the Disks pane, the iSCSI-based virtual disk size does not update accordingly. However, when checking the iSCSI disk on the SPM host, the size of the disk is correctly updated.

Solution: There is no workaround for this behavior.

Bug: 29370809

Virtual Machine Templates Can Be Imported with MAC Addresses Not in Range for the MAC Address Pool

virtual machine templates can be imported with MAC addresses that are out of range for the MAC address pool.

Solution: If there is a MAC address range restriction for your virtualization environment, the workaround is to manually change the MAC address to an address within the range of the MAC address pool before starting the virtual machine.

Bug: 29449334

Oracle Linux Virtualization Manager Does Not Prevent Adding a Direct LUN Disk Being Used by an Active Storage Domain

The Manager prevents creating a storage data domain on LUNs that are being used by direct LUN disks. The Manager, however, does not prevent adding a direct LUN disk that is being used by an active storage domain.

Solution: There is no workaround for this behavior. If you attempt to add a direct LUN disk that is being used by an active storage domain, the Manager prompts you to approve the operation with the following warning message: This message might be unrecoverable and destructive!

Bug: 29465439

Microsoft Windows 8 (and Later) Virtual Machines Disabling Third-Party Mini-Port Drivers

Microsoft Windows 8 (and later) virtual machines are disabling third-party mini-port drivers.

Solution:To bring back the third-party mini-port drivers, perform the following steps:

  1. Start a virtual machine using the IDE interface.
  2. Open the console for the virtual machine.

  3. Open the Command Prompt in the Microsoft Windows virtual machine and set the machine to boot in Safe Mode. 

    bcdedit /set {current} safeboot minimal
  4. Shutdown the virtual machine.

  5. Change the storage type.

    The virtual machine now starts normally.

  6. Reset the bcdedit setting to boot the virtual machine in Normal Mode. 

    bcdedit /deletvalue {current} safeboot
  7. Reboot the virtual machine.

Bug: 29472477

Manager Does Not Prevent Attaching VirtIO-SCSI Disks to OL6U10_X86 Virtual Machines

Manager does not prevent attaching VirtIO-SCSI disks to OL6U10_X86 virtual machines. The VirtIO-SCSI option in the Manager should be disabled for OL6U10_X86 virtual machines in the Virtual Machine: Resource Allocation Settings.

Solution: There is no workaround for this behavior. Do not attach VirtIO-SCSI disks to OL6U10_X86 virtual machines.

Bug: 29499061