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Servers cannot write to the LUN's due to WAFL very low on memory

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405
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Category:
ontap-9
Specialty:
CORE
Last Updated:

Applies to

ONTAP 9.2 or lower

Issue

  • Node is offline (hung) with aggregates state unknown and not responding to the ONTAP CLI:

::> aggr show
    Info: Node node_name_2 that hosts aggregate aggr0_node_name_2 is offline
          Node node_name_2 that hosts aggregate aggr2_node_name_2 is offline

    Aggregate     Size Available Used% State   #Vols  Nodes            RAID Status
    --------- -------- --------- ----- ------- ------ ---------------- ------------
    ...
    aggr0_node_name_2    -         -     - unknown      - node_name     -
    aggr2_node_name_2    -         -     - unknown      - node_name        -

::> storage failover show
                              Takeover
Node           Partner        Possible State Description
-------------- -------------- -------- -------------------------------------
node_name_1      node_name_2      true Connected to node_name
node_name_2      node_name_1      -        Up. Node accessible via HA-IC, but
     cluster access failed
2 entries were displayed.

  • Servers cannot write on LUN's and data and root aggregates are seen offline. EMS logs example:
Sat Jan 09 04:14:35 CET [node_name-01: scsit_lu_1: wafl.memory.statusVeryLowMemory:alert]: WAFL is running very low on memory, with 1454MB remaining.
Sat Jan 09 04:19:35 CET [node_name-01: scsit_lu_0: wafl.memory.statusVeryLowMemory:alert]: WAFL is running very low on memory, with 0MB remaining.
Sat Jan 09 04:57:17 CET [node_name-01: scsit_lu_1: wafl.memory.statusVeryLowMemory:alert]: WAFL is running very low on memory, with 445MB remaining.
  • A system uptime is higher than 300 days.
Sat Jan 09 01:00:00 CET [node_name-01: statd: kern.uptime.filer:info]:   1:00am up 398 days, 12:12 3 NFS ops, 0 CIFS ops, 0 HTTP ops, 78932960637 FCP ops, 0 iSCSI ops

 

 

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