Skip to main content
NetApp Knowledge Base

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

Views:
375
Visibility:
Public
Votes:
0
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

 

 

Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.