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FlexCache origin write failures caused by IPFW state exhaustion on port 11105

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Category:
ontap-9
Specialty:
nas
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Applies to

  • NetApp ONTAP 9
  • FlexCache
  • WAN
  • NFS

Issue

  • FlexCache origin write operations can fail or appear hung even though the origin volume remains online.
  • Clients can report write failures, hangs, or intermittent access problems while using FlexCache.
  • EMS may report `ipfw.ReachedMaxStates` when the node cannot allocate additional firewall keep-state entries.
    • [node-##: OscHighPriThreadPoo: ipfw.ReachedMaxStates:notice]: The ipfw firewall failed to create dynamic "keep-state" entry. Reason: Dynamic entries for 'keep-state' rules allocation failure, current # of entries: 31446. Recent connections reaching this limit: [intercluster_lif]:47238->[intercluster_lif]:11105 (TCP):32272
  • In some environments, `Nblade.dBladeNoResponse` and `csm_createSessionFailed` can also appear once new intercluster connections can no longer be created.
  • The problem is typically associated with a large number of persistent FlexCache / CSM connections on TCP port 11105.
  • The issue can become more visible after topology growth, peer changes, or node reboots when large numbers of sessions are re-established.

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