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    • Slowness on FC LUNs on new ONTAP Cluster
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Slowness_on_FC_LUNs_on_new_ONTAP_Cluster
      Applies to ONTAP 9 Upgrade to new AFF Cluster FC LUNs Issue Migration from an old AFF to new AFF, such as an AFF-8080 to AFF-A400 seems to show worse performance 1 GB/s is expected such as on AFF-8080...Applies to ONTAP 9 Upgrade to new AFF Cluster FC LUNs Issue Migration from an old AFF to new AFF, such as an AFF-8080 to AFF-A400 seems to show worse performance 1 GB/s is expected such as on AFF-8080, but performance may only be 300-700 MB/s High latency is seen if using indirect i/o (using a LIF on node 1, but the volume resides on node 2's disks) SnapMirror testing (used as a baseline) of performance between one node and another only does 300 MB/s of throughput
    • Frequent "PowerOn Reset" error reports on VMware vmkernel log
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Frequent_PowerOn_Reset_error_messages_on_VMware_vmkernel_log
      ESXi hosts report PowerOn Reset Power-on Reset occurred on naa.xxxxx error frequently 2022-08-09T08:02:16.008Z cpu33:2097270)ScsiDeviceIO: 4161: Cmd(0x45d90168c588) 0x28, CmdSN 0x1d1 from world 209752...ESXi hosts report PowerOn Reset Power-on Reset occurred on naa.xxxxx error frequently 2022-08-09T08:02:16.008Z cpu33:2097270)ScsiDeviceIO: 4161: Cmd(0x45d90168c588) 0x28, CmdSN 0x1d1 from world 2097521 to dev "naa.600a09803xxxxxxxxxxxx" failed H:0x0 D:0x18 P:0x3 2022-08-09T08:02:16.008Z cpu33:2097270)ScsiDeviceIO: 2503: Completed command 0x28 with status H:0x0 D:0x18 P:0x3 after losing reservation on device naa.600a09803xxxxxxxxxxxx (world 2097521)
    • Cloning a VM in the same datastore is slow
      https://kb.netapp.com/on-prem/ontap/da/Host-Utilities/Host-Utilities-KBs/Cloning_a_VM_in_the_same_datastore_is_slow
      Applies to SAN (Storage Area Network) VAAI (vStorage API for Array Integration) Issue Cloning a virtual machine in the same datastore takes several minutes Copy offload does not work
    • VAAI clone operation on the same datastore is not fast enough
      https://kb.netapp.com/on-prem/ontap/DM/VAAI/VAAI-KBs/VAAI_clone_operation_on_the_same_datastore_is_not_fast_enough
      Applies to ONTAP NetApp NFS Plug-in for VMware VAAI Issue VMware VM clone within the same datastore is not fast enough The NFS Plug-in is installed and configured
    • Cloning a powered on VM takes long time to complete
      https://kb.netapp.com/on-prem/ontap/DM/VAAI/VAAI-KBs/Cloning_a_powered_on_VM_takes_long_time_to_complete
      Applies to Cloning an powered on VM stored in NFS datastore ONTAP nfs volume configured with the requirements for NFS Plug-in for VAAI Issue VM clone takes long time to complete and it is not offloade...Applies to Cloning an powered on VM stored in NFS datastore ONTAP nfs volume configured with the requirements for NFS Plug-in for VAAI Issue VM clone takes long time to complete and it is not offloaded to the storage array.
    • VM disk type displayed as Thin Provision after VAAI is installed
      https://kb.netapp.com/on-prem/ontap/DM/VAAI/VAAI-KBs/VM_disk_type_displayed_as_Thin_Provision_after_VAAI_is_installed
      Applies to NetApp VMware vSphere Storage APIs Array Integration (VAAI) plugin VMware vCenter 7.0.x VMware ESXi host 7.0.x Issue On vCenter UI the properties of the VM disks are displayed as Thin Provi...Applies to NetApp VMware vSphere Storage APIs Array Integration (VAAI) plugin VMware vCenter 7.0.x VMware ESXi host 7.0.x Issue On vCenter UI the properties of the VM disks are displayed as Thin Provision and there's no drop-down to change it even after VAAI Plugin installation After inflating a disk the disk type is still shown as Thin Provision
    • NetApp NFS Plugin for VMware VAAI: Thin VMDKs automatically convert to Eager Zeroed Thick
      https://kb.netapp.com/on-prem/ontap/DM/VAAI/VAAI-KBs/NetApp_NFS_Plugin_for_VMware_VAAI__Thin_VMDKs_automatically_convert_to_Eager_Zeroed_Thick
      Applies to VMware vSphere NetApp NFS Plug-in for VMware VAAI NFSv3 NetApp Clustered ONTAP 9.x Issue VM VMDKs are inflated after a VMware snapshot consolidation Reporting shows the disk as Eager Zeroed...Applies to VMware vSphere NetApp NFS Plug-in for VMware VAAI NFSv3 NetApp Clustered ONTAP 9.x Issue VM VMDKs are inflated after a VMware snapshot consolidation Reporting shows the disk as Eager Zeroed Thick (EZT) instead of thin Issue occurs intermittently
    • NFS VAAI - Attempting to create thin VMDKs results in Thick Provisioned Lazy Zeroed VMDKs
      https://kb.netapp.com/on-prem/ontap/DM/VAAI/VAAI-KBs/NFS_VAAI_Attempting_to_create_thin_VMDKs_results_in_Thick_Provisioned_Lazy_Zeroed_VMDKs
      Applies to NetApp NFS Plug-in for VMware VAAI 1.1.x ONTAP 9.x ESXi 6.x Issue You create a thin VMDK disk for a new or existing virtual machine. However, the disk created is a Thick Provisioned Lazy Ze...Applies to NetApp NFS Plug-in for VMware VAAI 1.1.x ONTAP 9.x ESXi 6.x Issue You create a thin VMDK disk for a new or existing virtual machine. However, the disk created is a Thick Provisioned Lazy Zeroed disk This is seen when a disk creation operation is initiated on a indirect volume mount by an ESXi host with NFS VAAI installed Note: Indirect volume mounts are when a volume is mounted to a LIF that is on a node that is not local to the volume. Result after disk creation:
    • What is a PIT file in Data ONTAP?
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/What_is_a_PIT_file_in_Data_ONTAP
      A Point-In-Time (PIT) file is a special file used for ODX or Copy Offload procedures. Copy Offload is the process of sending only control data from the client to ONTAP while copying from one folder to...A Point-In-Time (PIT) file is a special file used for ODX or Copy Offload procedures. Copy Offload is the process of sending only control data from the client to ONTAP while copying from one folder to another on the same storage node. The contents of the file are transferred internally in ONTAP and the client requests the blocks to be transferred. The PIT file is the container which ONTAP uses to copy the blocks internally from one folder to another
    • What is the "_ocs_vserver" workload in qos statistics?
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/What_is_the_ocs_vserver_workload_in_qos_statistics
      This may be copied from one part of a volume to another of the same volume, or another volume on the same ONTAP node/cluster Offloading the reading of data from a source and the writing to a destinati...This may be copied from one part of a volume to another of the same volume, or another volume on the same ONTAP node/cluster Offloading the reading of data from a source and the writing to a destination via the use of an in-band SCSI command known as EXTENDED_COPY These workloads follow a well-defined naming scheme; each workload name is of the form _ocs_vserver_<vserver UUID>, where the vserver ID is the UUID of the destination vserver.
    • When does the NetApp NFS Plugin for VMware VAAI improve clone performance?
      https://kb.netapp.com/on-prem/ontap/DM/VAAI/VAAI-KBs/When_does_the_NetApp_NFS_Plugin_for_VMware_VAAI_improve_clone_performance
      The clone is performed within the same volume. When ONTAP receives an NFS VAAI clone request, it uses a built-in copy manager to determine which cloning engine to use. Used when the source and destina...The clone is performed within the same volume. When ONTAP receives an NFS VAAI clone request, it uses a built-in copy manager to determine which cloning engine to use. Used when the source and destination locations are within the same node Used when the source and destination location is the same volume and FlexClone is licensed and the volume is configured for deduplication Hole punching is the process of removing sparse blocks (holes) from copied blocks after a copy offload operation.