Installation

• Adding new ESXi hosts to a cluster that already has VirtuCache.
• After a VirtuCache driver update - the prior configuration is automatically applied
• After registering VirtuCache vCenter Flash client plugin the VirtuCache tab might not appear immediately.
• Applying a New Temporary License Key for VirtuCache
• Changing IP address of VirtuCache Manager VM
• Creating a user in ESXi with root privileges
• Ensuring that Infinio is uninstalled before installing VirtuCache
• Flash client plug-in doesn't show any data in vcenter 6.7 Flash client
• FusionIO cards in ESXi 6.x
• If VFRC or Host Swap Cache was being used prior to VirtuCache, please remove Virtual Flash Resource in VMware
• In case of multiple vCenters in the environment
• Installation and Configuration Instructions for VirtuCache in a VMware Stretched Cluster
• Maximum SSD capacity as cache device
• One Page Installation and Configuration Instructions for VirtuCache
• Plugin Migration when vCenter is Migrated
• Points to note for VirtuCache evaluation
• PowerCLI Script for Changing PSP to Virtunet Round Robin and setting RR IOPS to 1
• Process to Get a Permanent License Key for VirtuCache and Applying it
• Reinstalling / Upgrading VirtuCache
• To assign a higher Queue Depth to a ESXi host SATA or SAS SSD, configure SSD as Raid 0 and not Raid 1 device
• Uninstalling and Upgrading VirtuCache when ESXi and/or vCenter is Upgraded
• Unloading and Re-loading VirtuCache Driver
• VAAI Plugin Dependency for VirtuCache
• VirtuCache 2.0 GUI showing hosts but no other data from vCenter is being displayed
• VirtuCache deployment using VMware Update Manager / Lifecycle Manager
• VirtuCache Manager OVA import is stuck at 'Validating' message
• VirtuCache's VMware Flash web client is not updating.
• When a VM has many vDisks across different Datastores

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Configuration

• Accelerating Veeam backups
• Adding new ESXi hosts to a cluster that already has VirtuCache.
• After a VirtuCache driver update - the prior configuration is automatically applied
• After registering VirtuCache vCenter Flash client plugin the VirtuCache tab might not appear immediately.
• Auto-complete in VM tab in the GUI doesn't work
• Changing IP address of VirtuCache Manager VM
• Changing Path Selection Policy (PSP)
• Configuring IP address for eth1 interface for VirtuCache Management VM
• Configuring Windows VMs for Maximum IO
• Creating a redundant network for write replication
• Creating a second userid in ESXi with root privileges
• Datastores not showing in VirtuCache GUI when only one host is in the cluster
• Disk.SchedNumReqOutstanding (DSNRO) parameter that restricts LUN Queue Depth
• Email alerts to be sent to Virtunet in case of VirtuCache errors
• Ensuring that Queue Depths are Not the Bottleneck
• Figuring out Transport Mode and Storage Controller Snapshots in Veeam
• Flash client plug-in doesn't show any data in vcenter 6.7 Flash client
• Flushing cache to SAN before backups are initiated - Write-Back caching, Veeam Direct SAN access transport mode, and storage controller snapshots
• GUI not showing any objects or objects in GUI disappearing intermittently
• Host Failure and 'Write-Back One Replica' Caching Policy
• How to find out the Adapter Queue Depth and Device Queue Depth of RAID controller and RAIDed SSD?
• How to know if you need more cache capacity?
• How to Quickly Change the Boot Device for VMware ?
• How to use the same physical NIC ports as iSCSI for VirtuCache replication, since those are the only 10gbps ports on our hosts
• In case of multiple vCenters in the environment
• Increasing the Destaging Window for Dirty Write Cache
• Installation and Configuration Instructions for VirtuCache in a VMware Stretched Cluster
• Maximum SSD capacity as cache device
• Multi Pathing in RedHat and SuSE CEPH
• Plugin Migration when vCenter is Migrated
• PowerCLI Script for Changing PSP to Virtunet Round Robin and setting RR IOPS to 1
• Powershell scripts to move VMs to Write-Through before storage appliance snapshot starts and move VMs back to original caching policy after snapshot completes
• Read redirects when VM vMotions
• Reinstalling / Upgrading VirtuCache
• Resetting stats in VirtuCache Manager GUI
• Selecting a NVME SSD for a new ESXi Host
• Selecting SSD to Cache for Standalone Host that's not in a VMware Cluster
• Setting IOPS limit for path switch over for Round Robin PSP
• Support for Multi-Path Plugins (MPP)
• Supported Horizon View VDI features
• Testing Jumbo Frames on the VirtuCache Replication Network
• To assign a higher Queue Depth to a ESXi host SATA or SAS SSD, configure SSD as Raid 0 and not Raid 1 device
• U.2 to PCIe Adapter for NVME SSDs
• Unloading and Re-loading VirtuCache Driver
• Using RAID SSDs as Cache Device
• VirtuCache Caching to RAM and VMware Service Provider Pricing
• VirtuCache compatibility with VMware snapshots
• VirtuCache Configuration for Reducing Write Latencies in a VMware Stretched Cluster
• VirtuCache interoperability with Veeam, Zerto, Commvault, Avamar, AppAssure. Nakivo, Actifio and Tivoli backup and replication software
• VirtuCache Plugin for HTML5 and Flash vCenter Web Clients
• VirtuCache's VMware Flash web client is not updating.
• vMotion between hosts that are in two different datacenters
• VMs not in Write-Back mode because of Replication Network issues
• VMs not moving to 'Write Back' operational state when using vMotion TCP/IP stack.
• Vmware Replication is supported
• What caching policy is assigned if VMDKs for a VM are in different Datastores?
• What happens to the cache when a VM is powered off
• What to do if plugin in the thick client doesn't show
• When a VM has many vDisks across different Datastores
• Why are my backup times not improving with VirtuCache?
• Write Back caching policy
• Write cache replication to protect against data loss in case of host failure
• Write Through caching policy

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Troubleshooting

• After registering VirtuCache vCenter Flash client plugin the VirtuCache tab might not appear immediately.
• After VM is restored or migrated to the cluster that uses VirtuCache, the VM doesn't show in the VirtuCache GUI
• Assigning a SSD to VirtuCache fails if the SSD was being used by another host side caching software
• Assigning unique BIOS UUID to VMs sharing the same BIOS UUID (duplicate UUIDs)
• Changing Path Selection Policy (PSP)
• Consequences of path failover in VirtuCache
• Copying VirtuCache OVA to a Datastore fails with message "Typically this problem occurs due to certificates..."
• Creating a second userid in ESXi with root privileges
• Dell Equallogic Appliance
• Disk.SchedNumReqOutstanding (DSNRO) parameter that restricts LUN Queue Depth
• Duplicate UUIDs when using Instant Clones and AppVolumes in Horizon VDI
• Duplicate UUIDs when VMs are deployed from vApp templates in vCloud Director
• Error : Cannot remove module vnx2: Consumed resource count of module is not zero
• Extracting SQLite Database from VirtuCache Manager VM
• Finding out host memory usage by VirtuCache
• Flushing cache to SAN before backups are initiated - Write-Back caching, Veeam Direct SAN access transport mode, and storage controller snapshots
• FusionIO cards in ESXi 6.x
• GUI not showing any objects or objects in GUI disappearing intermittently
• High latency because insufficient RAM or SSD capacity assigned to VirtuCache
• High network latencies in CEPH as shown in VirtuCache charts
• Host Failure and 'Write-Back One Replica' Caching Policy
• Hosts not showing in VirtuCache GUI
• How does VirtuCache handle host failure and VMware High Availability (HA) ?
• How to decode VMware/SCSI error/sense codes
• How to delete VirtuCache plugin from VMware's thick (.NET) client
• How to delete VirtuCache vclient plugin in VMware's Flash GUI?
• How to delete VirtuCache vclient plugin in VMware's HTML5 GUI?
• How to find out the Adapter Queue Depth and Device Queue Depth of RAID controller and RAIDed SSD?
• How to find the build number of VirtuCache caching driver software?
• How to identify the VirtuCache adapter (vmhba)?
• How to know if you need more cache capacity?
• How VirtuCache supports regular vMotion, Storage vMotion, X-vMotion across different vcenter objects?
• HTML5 Plugin for vCenter doesn't show any data
• HTML5 plugin is not attaching to vCenter
• If the Flash web client is not working?
• If the SSD does not show up in the Cache Device drop down box?
• If VFRC or Host Swap Cache was being used prior to VirtuCache, please remove Virtual Flash Resource in VMware
• If VirtuCache GUI shows no data after applying a permanent license key
• In case of multiple vCenters in the environment
• In case the Write-Replication network fails
• Incorrect VM performance data in VirtuCache plugin for vCenter Flash client for VDI, Xenapp, and VMs with snaphot
• Instructions to upload VMware and VirtuCache logs to Virtunet Google Drive or FTP location
• Interoperability with Instant Clones
• Log collection in a secure, classified environment
• Log4j vulnerability doesn't affect VirtuCache
• Low cache hit ratio if RAM assigned to VirtuCache is always full
• Low Cache Hit Ratios for VMware View using Linked Clones
• Low Cache Hit Ratios when Backend Disk is SATA Hard Drive
• Low Queue Depth on HP Smart Array Controller
• LUN IDs are different than original LUN IDs and multiple paths to the same LUN have different LUN IDs
• LUN numbers shown in VMware are different from backend storage LUN numbers
• NVME SSDs not performing as expected in ESXi 6.0 with the in-box NVME device driver
• Out of memory condition prevents the SSD from being assigned to VirtuCache
• Paths get disabled when VirtuCache fronts CEPH
• Peer connections not established if hosts in a cluster have different VirtuCache build number
• Performance deteriorates if VMs have snapshots
• Points to note for VirtuCache evaluation
• RAID Controller on IBM hosts System x3850 x5 7145 AC1 is the cause of high latencies
• Read redirects when VM vMotions
• Retrieving logs to debug issues in VirtuCache / Exporting support bundle with logs
• SAN Errors in the Hosts Tab in VirtuCache GUI
• Script to find VMs with duplicate UUIDs
• Setting IOPS limit for path switch over for Round Robin PSP
• Situations where writes might not be accelerated even with Write Back policy
• SSD fails to attach to VirtuCache
• SSD failure alert in vCenter
• Support for Multi-Path Plugins (MPP)
• Test results using Iometer, FIO, Diskspd or other synthetic testing tools don't look very good.
• Testing Jumbo Frames on the VirtuCache Replication Network
• To assign a higher Queue Depth to a ESXi host SATA or SAS SSD, configure SSD as Raid 0 and not Raid 1 device
• Unloading and Re-loading VirtuCache Driver
• Using just ESXi CLI, how do you find out the storage protocol used by VMware vSphere to connect to Storage?
• vCenter plugin is not showing any data in ESXi 6.7
• Veeam Instant Recovery Support
• Veeam SureBackup Support
• VirtuCache 2.0 GUI showing hosts but no other data from vCenter is being displayed
• VirtuCache can automatically claim LUNs using these PSPs
• VirtuCache compatibility with VMware snapshots
• VirtuCache doesn't support Write-Back caching for a cluster with mixed ESXi 6.x and 7.x hosts
• VirtuCache interoperability with Veeam, Zerto, Commvault, Avamar, AppAssure. Nakivo, Actifio and Tivoli backup and replication software
• VirtuCache Manager OVA import is stuck at 'Validating' message
• VirtuCache plugin showing 'Error expanding plug-in zip' and/or 'Error downloading plug-in'
• VirtuCache SATP compliance
• VirtuCache support for VSAN
• VirtuCache's VMware Flash web client is not updating.
• VM Operational State Different from Caching Policy
• VMs don't show in VirtuCache GUI due to intermittent Datastore connectivity
• VMs not in Write-Back mode after VMware cluster assignment is changed for the host(s)
• VMs not in Write-Back mode because of 'LUN not claimed' message
• VMs not in Write-Back mode because of Multi-Writer VMDK
• VMs not in Write-Back mode because of Replication Network issues
• VMs not in Write-Back mode because they might be on local storage
• VMs not in Write-Back mode because VirtuCache driver versions are not the same across hosts
• VMs not moving to 'Write Back' operational state when using vMotion TCP/IP stack.
• VMs with Duplicate BIOS UUIDs when using Datrium Cloning
• VMs with duplicate UUIDs don't show in VirtuCache GUI
• VMs with Duplicate UUIDs when using Veeam Instant Recovery
• VMware Balloon Driver Causes Application Performance Issues in Guest VMs
• VMware PSP is now VMW_PSP_MRU (or VNX_PSP_MRU). It was VMW_PSP_RR (or VNX_PSP_RR) before
• What caching policy is assigned if VMDKs for a VM are in different Datastores?
• What to do if plugin in the thick client doesn't show
• Why are my backup times not improving with VirtuCache?
• Write-Back caching policy not allowed for VMs with Duplicate UUIDs

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System Requirements

• Clustering and RDM
• List of VMware ESXi versions supported by VirtuCache
• VAAI Plugin Dependency for VirtuCache

Quick Recommendations

• Choosing the Right Type and Capacity of SSD
• One Page Installation and Configuration Instructions for VirtuCache
• Points to note for VirtuCache evaluation
• Uninstalling and Upgrading VirtuCache when ESXi and/or vCenter is Upgraded
• Write cache replication to protect against data loss in case of host failure

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Statistics

• Collecting Physical Disk Performance Statistics for Windows VMs using Perfmon
• Using VMware Labs IOAnalyzer VM to Measure Throughput and Latencies Across Multiple ESXi Servers
• Various Ways to Collect Historical Throughput and Latency Data at the VM Level

Uninstalling

• After a VirtuCache driver update - the prior configuration is automatically applied
• FusionIO cards in ESXi 6.x
• How to delete VirtuCache plugin from VMware's thick (.NET) client
• How to delete VirtuCache vclient plugin in VMware's Flash GUI?
• Uninstalling VirtuCache after an evaluation
• VirtuCache vib cannot be removed - Error in running rm /tardisks/vnx2.v00

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