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CONTAP-114158: Urgency is reported prematurely, on thinly-provisioned Flexgroups, when aggregate free space is less than the Flexgroup constituent size

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ontap-9
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Issue

  • FlexGroup urgency is reported prematurely, which can potentially result in performance
  degradation. 
  • This is seen running the node level flexgroup show.
Example: Aggregate 1 on node 1 is full so the FlexGroup is full, increasing urgency above 0.

  Cluster::> storage aggregate show -aggregate *aggr1

  Aggregate     Size Available Used% State   #Vols  Nodes            RAID Status
  --------- -------- --------- ----- ------- ------ ---------------- ------------
  aggr1_n1   23.93GB   328.0MB   99% online       4 sti74-vsim-      raid_dp,
                                                    ucs176i          normal
  aggr1_n2   23.93GB   23.93GB    0% online       0 sti74-vsim-      raid_dp,
                                                    ucs176j          normal
  4 entries were displayed.

  Cluster::> volume show -volume fg
  Vserver   Volume       Aggregate    State      Type       Size  Available Used%
  --------- ------------ ------------ ---------- ---- ---------- ---------- -----
  vs0       fg__0001     sti74_vsim_ucs176i_aggr1
                                      online     RW        512MB         0B  100%
  vs0       fg__0002     sti74_vsim_ucs176i_aggr1
                                      online     RW        512MB         0B  100%

  Cluster::> set -privilege diagnostic; node run -node n1 flexgroup show
  ...							
  Idx   Member L            Used      Avail Urgc  Target 
  --- -------- - --------------- ---------- ---- ------- 
    1     1061 L     118879  95%     124519  68%  44.60% 
    2     1062 L     116555  93%     124519  45%  55.39%

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