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Slow clone splits with all data in the cold tier

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • FabricPool
  • FlexClone Split

Issue

  • A large clone volume (tens of TB or larger) is taking a long time to split and is stuck at 1% and may take years to finish
  • Throughput is slow with the following command:
    • Cluster::> set -privilege diag; statistics show-periodic -object object_store_client_op_stats -counter throughput_bytes -instance=0_get
  • The following clone was started on April 28 but was still at 1% as of May 17:
Thu xxx xx 18:39:29 -0400 [cluster: vv_config_worker19: wafl.volume.clone.split.started:info]: Clone split was started for volume vol01@vserver:abcdefgh-1234-5678-9012-1234567890ab
Thu xxx xx 18:39:29 -0400 [cluster: scan_clone_split_wkr: wafl.scan.start:debug]: Starting volume clone split on volume vol01@vserver:abcdefgh-1234-5678-9012-1234567890ab.

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