Linux RN Limitations
Recovery Nodes running Linux have the following limitations:
• To support booting of Recovery Nodes (RN) for RHEL 5.x servers, you must download the appropriate version of Xen‑compatible kernel packages and install them on the Protected Nodes (PN) before enrolling or attempting to build the RNs for such clients. The installed Xen kernel will not be an active kernel on the PN; instead, that kernel will be used to boot the RNs. For more information, go to
Install kernel‑xen RPM package.
• Linux PNs may return 256 code during an auto-upgrade. If you encounter this error, restart (stop/start) protection to re-initiate the auto-upgrade.
• BMR and incremental failback for Linux nodes are not supported in this release.
• Due to a XenServer limitation (XenServer does not currently support VHDX format), a single protected volume for Linux PNs is limited to a maximum size of 2TB. (This limitation is not applicable to Windows, which supports dynamic disks.) If you try to protect a volume that's greater than 2TB, the onQ Portal returns an error and resets the size to the maximum:
Boot disk must fit on single VD so is limited to 1988GB. 