Disable EWF in a Hibernate Once/Resume Many Environment (Standard 7 SP1)

  • Article

7/8/2014

If you want to make changes or apply updates to your run-time image in a Hibernate Once/Resume Many (HORM) environment, you must first disable Enhanced Write Filter (EWF). Because the Boot Environment loads the hibernation file before it reads the pending EWF Manager start commands, you must disable EWF and load the system as usual.

Because Hibernate Once/Resume Many environments are supported in EWF RAM and RAM Reg modes, you can use the ewfmgr -commitanddisable -live command which saves the runtime image from the EWF overlay to the persistent image on the system. In some cases, this is not desirable as it commits the whole cached image. To apply a specific set of changes to the system, you can disable EWF, disable HORM, apply changes, and re-enable HORM.

To disable EWF in a Hibernate Once/Resume Many environment

  1. Disable EWF by using the EWF Manager command or the EWF API, for example:

    ewfmgr -all -disable

  2. Deactivate HORM by using the EWF manager command or the EWF API, for example:

    ewfmgr -all -deactivatehorm

  3. Restart the system.

  4. After EWF is disabled, you can apply updates or install applications to your run-time image. To re-enable Hibernate Once/Resume Many, see Enable a Hibernate Once/Resume Many Environment by Using EWF.

See Also

Tasks

Apply Updates to a System That Uses Hibernate Once/Resume Many

Other Resources

Hibernation and EWF
EWF Performance Considerations
Use an Unprotected Volume in a Hibernate Once/Resume Many Environment