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VMware ESX 4.0, Patch ESX400-200907401-BG: Updates vmklinux and vmkernel64 (1013026)

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Release Date: August 07, 2009

Download Size:
136.8 MB
Download Filename:

Product Versions ESX 4.0
Also see KB 1012514
Patch Classification Critical
Host Reboot Required Yes
Virtual Machine Migration or Shutdown Required Yes
PRs Fixed 444934
Affected Hardware RAID controller
Affected Software megaraid2, megaraid_sas, and aacraid
VIBs Included vmware-esx-drivers-vmklinux-vmklinux
Related CVE numbers N/A



On systems with ESX 4.0  installed, if the RAID controller battery backup unit is completely discharged after a shutdown, or if a locally attached disk is removed and not reconnected to the system, data corruption might occur because the RAID controller cache is not cleared while shutting down the server.

Note: The typical battery discharge period is approximately 48 hours.


The following symptoms might appear based on the kind of data that is not cleared from the RAID cache:

  • Boot failure
  • Loss of customized configuration
  • Loss of data
  • A message indicating that the cache is cleared (or flushed) during the power-on self-test (POST) after rebooting ESX 4.0 system.
    This is an indication that the write-back cache is not cleared to disk during the previous system shutdown.

This issue might occur when all the following conditions are true:

  • RAID controllers use the following drivers:
    • megaraid2
    • megaraid_sas
    • aacraid
  • The cache policy in the controllers is set to write-back cache.
    Note: To check if the cache policy is set to write-back cache, boot the host machine and check the controller BIOS. For more information, refer the documentation for the specific RAID controller.
  • The RAID controller battery backup unit is completely discharged.
  • SAS or SCSI storage is directly attached to the server.   


  1. Verify if the RAID controller is using any of the affected drivers and attached local storage. For instructions, refer KB 1012794.
  2. If your system is affected, install this patch (ESX400-200907401-BG). 

To shut down or reboot ESX 4.0 hosts, refer the instructions in the KB 1013193.

Deployment Considerations

None beyond the required patch bundles and reboot information listed in the table, above.

Patch Download and Installation

See the VMware vCenter Update Manager Administration Guide for instructions on using Update Manager to download and install patches to automatically update ESX 4.0 hosts.

To update ESX 4.0 hosts when not using Update Manager, download the patch zip file from and install the bulletin using esxupdate from the command line of the host. For more information, see the ESX 4 Patch Management Guide.

Request a Product Feature

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.


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