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High CPU iowait after SANtricity upgrade on StorageGRID Appliances

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storagegrid
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Applies to

  • StorageGRID Appliances SG6060
  • StorageGRID Appliances SG6160

Issue

After upgrading SANtricity OS on StorageGRID appliances (SG6060 and SG6160), the following symptoms were observed in Support--Metrics--Node(Internal Use):
  • CPU utilization and iowait remained high
  • Disk and metadata volume read latency increased significantly
  • IOPS and read throughput remained unchanged
  • SSD cache hit rate reset to zero after SANtricity upgrade and gradually increased over time

SG6060.png

SG6160.png

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