Hypervisor Host Configuration - viewLinc 5.2

Berkeley DB Reliable Write Configuration Checklist viewLinc Enterprise Server
Product status
Document code
DOC261041-A
ft:locale
en-US
Product
viewLinc 5.2
Document type
Checklist
Technical note
Guidance Action for Hyper-V Action for VMware
☐ Disable automatic VM snapshots/checkpoints.

If snapshots are required, they should be taken while the application is idle.

Navigate to Hyper-V Manager > VM Settings and set Checkpoints to Disable

Disable automated snapshot policies in vCenter Lifecycle Manager or any backup job targeting this VM.
☐ Application-consistent backups only; no snapshot or migration under write load Do not run VSS or Hyper-V checkpoints against the live HDB volume during writes. Do not Live Migrate the VM under active write load. Do not take quiesced snapshots, run VADP/CBT backup jobs, or perform Storage/vMotion of the HDB VM under active write load.
☐ Disable virtual disk cache mode. This ensures that FlushFileBuffers() calls from BDB reach stable storage. Navigate to VM Settings > Hard Drive > Advanced Features and set Cache Mode: to None. Navigate on the virtual machine to Edit Settings > Hard Disk1 > Disk Mode: and select Independent – Persistent.
Use this procedure to edit the VM's .vmx file as follows:
  • Set disk.EnableUUID = "TRUE"
  • Confirm that no scsiX:Y.writeThrough = "FALSE" entries exist.
☐ Use fixed/thick-provisioned virtual disk Convert dynamic VHDX (Virtual Hard Disk v2) to fixed via PowerShell: Convert-VHD -Path "disk.vhdx" -DestinationPath "disk-fixed.vhdx" -VHDType Fixed

(See this document for more details.)

 Use Thick Provision Eager Zeroed VMDK. Thin-provisioned VMDKs introduce allocation overhead during write bursts. Convert via Storage vMotion or the procedure outlined here.
☐ Verify hypervisor tools/integration services are current Run on host: Get-VMIntegrationService -VMName <YourVM>

(See this document for more details.)

Update via Windows Update on the guest or reinstall the Hyper-V Integration Services package.

 Confirm VMwareTools status is Running or Current by navigating on the virtual machine to Summary.

Update by navigating on the virtual machine to Guest OS > Upgrade VMware Tools.
☐ Store virtual disk on local host storage, not network storage Avoid placing VHDX files on Server Message Block (SMB) shares or Cluster Shared Volumes (CSV). Confirm VHDX path via VMSettings > Hard Drive > Location. Avoid NFS data stores for BDB VMDKs. Use local VMFS or iSCSI with synchronous write guarantees. NFS data stores with async mount options are not safe for BDB.
☐ Disable host-level write cache on physical disks (without a battery-backup unit—BBU) On the Hyper-V host, confirm write-cache buffer flushing is NOT disabled unless a BBU is present via Device Manager > Disk Drives > Policies. On the ESXi host, confirm the storage controller has a functioning BBU or flash-backed write cache. Run the following command on the ESXi shell: esxcli storage core device list and verify the controller cache status via vendor management tools.

(See this document for more details.)