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FlexCache Volume Write Operations Hang with NFS4ERR_DELAY

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • NFSv4.1
  • Flexcache
  • Flexcache Volume with write-back enabled
  • Multi-constituent FlexCache Volume

Issue

  • Write and delete operations to a FlexCache volume intermittently hang when accessed via NFSv4.1.
  • Read operations are unaffected
  • Packet traces show NFS4ERR_DELAY errors on NFSv4.1 lookup operations :
27412 10.1.1.11   10.1.1.9 NFS 12386 V4 Call (Reply In 27458) WRITE StateID: 0x961a Offset: 3698524160 Len: 65536V4 Call (Reply In 35027) LOOKUP DH: 0xa444455/cluster.com
35027 10.19.146.9 10.19.146.11 NFS 166 V4 Reply (Call In 27412) LOOKUP Status: NFS4ERR_DELAY

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