8.4. Adding POSIX Compliant File System Storage

POSIX file system support allows you to mount file systems using the same mount options that you would normally use when mounting them manually from the command line. This functionality is intended to allow access to storage not exposed using NFS, iSCSI, or FCP.
Any POSIX compliant filesystem used as a storage domain in Red Hat Virtualization MUST support sparse files and direct I/O. The Common Internet File System (CIFS), for example, does not support direct I/O, making it incompatible with Red Hat Virtualization.

Important

Do not mount NFS storage by creating a POSIX compliant file system Storage Domain. Always create an NFS Storage Domain instead.

8.4.1. Attaching POSIX Compliant File System Storage

You want to use a POSIX compliant file system that is not exposed using NFS, iSCSI, or FCP as a storage domain.

Procedure 8.5. Attaching POSIX Compliant File System Storage

  1. Click the Storage resource tab to list the existing storage domains in the results list.
  2. Click New Domain to open the New Domain window.
    POSIX Storage

    Figure 8.3. POSIX Storage

  3. Enter the Name for the storage domain.
  4. Select the Data Center to be associated with the storage domain. The Data Center selected must be of type POSIX (POSIX compliant FS). Alternatively, select (none).
  5. Select Data / POSIX compliant FS from the Domain Function / Storage Type drop-down menu.
    If applicable, select the Format from the drop-down menu.
  6. Select a host from the Use Host drop-down menu. Only hosts within the selected data center will be listed. The host that you select will be used to connect the storage domain.
  7. Enter the Path to the POSIX file system, as you would normally provide it to the mount command.
  8. Enter the VFS Type, as you would normally provide it to the mount command using the -t argument. See man mount for a list of valid VFS types.
  9. Enter additional Mount Options, as you would normally provide them to the mount command using the -o argument. The mount options should be provided in a comma-separated list. See man mount for a list of valid mount options.
  10. Optionally, you can configure the advanced parameters.
    1. Click Advanced Parameters.
    2. Enter a percentage value into the Warning Low Space Indicator field. If the free space available on the storage domain is below this percentage, warning messages are displayed to the user and logged.
    3. Enter a GB value into the Critical Space Action Blocker field. If the free space available on the storage domain is below this value, error messages are displayed to the user and logged, and any new action that consumes space, even temporarily, will be blocked.
    4. Select the Wipe After Delete check box to enable the wipe after delete option. This option can be edited after the domain is created, but doing so will not change the wipe after delete property of disks that already exist.
  11. Click OK to attach the new Storage Domain and close the window.