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    • Slow directory deletion on FlexCache Origin
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Slow_directory_deletion_on_FlexCache_Origin
      Applies to ONTAP 9 FlexCache Issue Using the UNIX command 'rm -rf' to delete a directory on a volume that is a FlexCache Origin is slow
    • Slow FlexCache performance with source FAS2750 and write-back enabled
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Slow_FlexCache_performance_with_source_FAS2750_and_write-back_enabled
      Applies to FAS2750 ONTAP 9 CIFS SnapMirror Issue A FAS2750 that is writing to multiple flex cache volumes that have write-back enabled are showing slow performance with CIFS access. Snapshots are not ...Applies to FAS2750 ONTAP 9 CIFS SnapMirror Issue A FAS2750 that is writing to multiple flex cache volumes that have write-back enabled are showing slow performance with CIFS access. Snapshots are not completing with error in EMS Snapshot copy (Snapshot operation could not be completed within the timeout window.).
    • Attempts to delete a FlexCache origin volume result in error
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Attempts_to_delete_a_FlexCache_origin_volume_result_in_error
      Applies to ONTAP 9 FlexCache Issue The following error is observed when attempting to delete a FlexCache origin volume: Cluster:> volume delete -vserver test-svm -volume test Error: command failed: Vo...Applies to ONTAP 9 FlexCache Issue The following error is observed when attempting to delete a FlexCache origin volume: Cluster:> volume delete -vserver test-svm -volume test Error: command failed: Volume "test" in Vserver "test-svm" is an origin of a FlexCache volume. In order to delete an origin of a FlexCache volume, you must first delete the FlexCache volumes that are in relationship with the origin. Use the "volume flexcache origin show-caches -origin-vserver test-svm"
    • CIFS share access will fail if the share-path points to a nonexistent directory
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/CIFS_share_access_will_fail_if_the_share-path_points_to_a_nonexistent_directory
      Error such as that below may show up in EMS indicating that the directory backing the share does not exist / no longer exists CIFS share was created to a Flexcache volume CIFS share creation does not ...Error such as that below may show up in EMS indicating that the directory backing the share does not exist / no longer exists CIFS share was created to a Flexcache volume CIFS share creation does not perform backing directory validation when the directory is in a flexcache volume's namespace This makes sense, because a flexcache volume may not contain all files / directories present on the origin volume
    • Poor performance in FlexCache with write-back enabled
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Poor_performance_in_FlexCache_with_write-back_enabled
      Applies to ONTAP 9.15.1P1 and higher FlexCache with write-back enabled Issue Poor performance for writes to write-back enabled FlexCache. The performance seen is the same as if write-back was not enab...Applies to ONTAP 9.15.1P1 and higher FlexCache with write-back enabled Issue Poor performance for writes to write-back enabled FlexCache. The performance seen is the same as if write-back was not enabled.
    • Mount failure on remote FlexCache qtree for Linux Kernel 5.1 to 5.7 clients
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Mount_failure_on_remote_FlexCache_qtree_for_Linux_Kernel_5.1_to_5.7_clients
      Mount failure on remote FlexCache qtree for Linux Kernel 5.1 to 5.7 clients.
    • Attempting to mount FlexCache path gives "mount.nfs: Connection timed out"
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Attempting_to_mount_FlexCache_path_gives_mount_nfs__Connection_timed_out
      "mount.nfs: Connection timed out" on Linux, or equivalent mount error (actual error logged will be client platform specific.) When attempting to mount particular paths from a FlexCache volume, the mou..."mount.nfs: Connection timed out" on Linux, or equivalent mount error (actual error logged will be client platform specific.) When attempting to mount particular paths from a FlexCache volume, the mount operation times out. A packet trace shows that the NULL call for mount is replied to, but the MNT call is not - the client performs RPC retransmission of its request, but does not get a response (see Wireshark / tshark output example below.)
    • FlexCache volumes might become inaccessible after upgrading ONTAP release to 9.8
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/FlexCache_volumes_might_become_inaccessible_after_upgrading_ONTAP_release_to_9.8
      After upgrading the ONTAP release to 9.8, FlexCache volumes became inaccessible to client operations, and following ems entries were reported: Mon May 22 12:30:05 +0800 [sj-clus-01: wafl_exempt03: air...After upgrading the ONTAP release to 9.8, FlexCache volumes became inaccessible to client operations, and following ems entries were reported: Mon May 22 12:30:05 +0800 [sj-clus-01: wafl_exempt03: air.fc.origin.corrupt: The fh 2162551315~0.26554 in Origin of this FlexCache volume cachevol__0002@vserver:2066e40f-d88b-11ec-a228-00a0985a6ae8 contains inconsistencies.
    • Display Security info of a flexcache junction path fails with "Operation not supported."
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Display_Security_info_of_a_flexcache_junction_path_fails_with_Operation_not_supported
      When trying to display the security information of a path which happens to be the junction path of a flexcache volume, using the file-directory command, this fails with the message that the operation ...When trying to display the security information of a path which happens to be the junction path of a flexcache volume, using the file-directory command, this fails with the message that the operation is not supported. (volume flexcache show) Cache Junction Path: /ju-fc1 cluster2::*> file-directory show -vserver svm1 -path / cluster2::*> file-directory show -vserver svm1 -path /ju-fc1 (vserver security file-directory show) Error: show failed: The specified path "/ju-fc1" cannot be used.
    • Flexcache originDisconnected event reported
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Flexcache_originDisconnected_event_reported
      Applies to ONTAP 9 FlexCache Issue The following event is reported in EMS: flexcache.originDisconnected:EMERGENCY : FlexCache volume with Name Volume1 MSID 123xxxxx1 on Vserver Name vserver1 is discon...Applies to ONTAP 9 FlexCache Issue The following event is reported in EMS: flexcache.originDisconnected:EMERGENCY : FlexCache volume with Name Volume1 MSID 123xxxxx1 on Vserver Name vserver1 is disconnected from its origin volume with Vserver UUID xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx and MSID 321xxxxx9.
    • FlexCache creation fails when origin is encrypted and no excryption license at cache cluster
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/FlexCache_creation_fails_when_origin_is_encrypted_and_no_excryption_license_at_cache_cluster
      Error: command failed: [Job 126] Job failed: Failed to inherit the encryption property of However, after installing the volume encryption (VE) license, the error reported is changed: ::> volume flexca...Error: command failed: [Job 126] Job failed: Failed to inherit the encryption property of However, after installing the volume encryption (VE) license, the error reported is changed: ::> volume flexcache create -volume cache -aggr-list aggr1 -origin-volume origin -origin-vserver svm1 Error: command failed: [Job 127] Job failed: Failed to create the FlexCache volume. onboard enable -vserver <vserver_name>" command to configure the Onboard Key Manager for the appropriate Vserver.