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What are the top Citrix XenServer Issues/Workarounds/Best Practices for NFSv3?

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Applies to

  • Data ONTAP 7-Mode
  • Clustered Data ONTAP
  • Citrix XenServer

Answer

These are the top known issues, workarounds, and best practices for Citrix XenServer when used with NetApp FAS controllers running Data ONTAP 7-Mode or clustered Data ONTAP.

Known Issues and Workarounds:

Citrix XenServer 6.1

  • Supported Hotfix: XS61E001 XS61E003 XS61E004 XS61E006 XS61E007 XS61E008 XS61E009 XS61E010 XS61E012 XS61E013 XS61E014 XS61E015 XS61E030
  • Supported Kernel Version: 2.6.32.43-0.4.1.xs1.6.10.784.170772xen

Citrix XenServer 6.2

  • Supported Hotfix: XS62ESP1 XS62ESP1002 XS62ESP1004 XS62ESP1006 XS62ESP1007 XS62ESP1008 XS62ESP1011 XS62ESP1013 XS62ESP1015 XS62ESP1016 XS62ESP1021 XS62ESP1022 XS62ESP1023 XS62ESP1025 XS62ESP1026
  • Supported Kernel Version: 2.6.32.43-0.4.1.xs1.8.0.847.170785xen 

Citrix XenServer 6.5

  • Supported Kernel Version: 3.10.0+2 

Notes 

  • During NetApp Storage Controller Failover Operations, there is a rare risk that hosts running Citrix XenServer 6.1 might encounter network outages or the Guest OS becoming read-only. For XS6.2, hotfix XS62ESP1026 fixes the problem. Above listed supported hotfixes are mandatory. It is recommended to upgrade to XenServer 6.5, where this issue is not seen.
  • SnapDrive (any version) is not supported with Citrix XenServer.

Best Practices:

  • See TR-4067 for 'Clustered Data ONTAP NFS Best Practice and Implementation Guide'
  • Guest OS Support Recommendations: 
    • XenServer tools must be installed on each Virtual Machine (VM). Running a VM without installing the XenServer Tools is not a supported configuration.   
    • Linux VMs: All the supported Linux distributions should be deployed as paravirtualized. They utilize highly modified kernels and drivers that are fully optimized to achieve optimal performance within a virtualized environment. To be specific, supported OL5 and RHEL5 guest OS should be booted into Xen kernel. Boot OL6 and RHEL6 to RHCK (contains all required xen/paravirtualised drivers). Booting to UEK is not supported yet.
    • Windows VMs: All the supported Windows VMs should be deployed as 'Fully Virtualized with PV drivers' installed. PV drivers are part of XenServer tools.

Additional Information

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