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Trident provisioned LUN turns offline due to volume full

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ontap-9
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san
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Applies to

  • Trident
  • SAN

Issue

  • Linux  reports critical space allocation errors:

LINUX kernel: blk_update_request: critical space allocation error, dev xxx

LINUX kernel: blk_update_request: critical space allocation error, dev xxx

  • Data ONTAP sends an alert that a Trident volume (ontap-san backend) is full

ed Jan 24 13:33:22 +0800 [wafl_exempt13: wafl.vol.full:alert]: Insufficient space on volume c1_san_ssd_dc1_pvc_19a8fa1a_b8f1_4cd9_9fb8_xxxx@vserver:0b2a7d0a-0441-11ee-a219-xxxxxxxxxxx to perform operation. 72.0KB was requested but only 8.00KB was available.

  • The volume and LUN are provided by Trident automatically according to below rule:

ONTAP SAN configuration options and examples

Total volume size = [(PVC requested size) / (1 - (snapshotReserve percentage) /100)] * 1.1

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