High cpu utilization in host domain from MGWD in ONTAP 9.7
Applies to
- ONTAP 9.7 - 9.7P7
- Intercluster LIF
- MGWD
- HostOS CPU domain
Issue
- Increased CPU Utilization due to host domain in ONTAP 9.7
Example: sysstat -M
output showing high Host
domain activity (some columns removed for readibility):
Cluster::> set diag -c off; node run -node Cluster1-01 sysstat -M 1 ANY1+ ANY2+ ANY3+ ANY4+ AVG CPU0 CPU1 CPU2 CPU3 Host 100% 52% 33% 18% 51% 61% 54% 46% 42% 179% 100% 60% 38% 21% 55% 63% 58% 51% 48% 179% 100% 59% 39% 22% 55% 63% 58% 52% 48% 175% 100% 61% 40% 23% 56% 63% 58% 54% 49% 181% 100% 58% 38% 21% 54% 63% 55% 51% 48% 177% 100% 55% 35% 20% 53% 62% 54% 50% 44% 180% 100% 54% 33% 18% 51% 61% 53% 49% 44% 179% 100% 46% 29% 14% 47% 59% 51% 42% 37% 179% 100% 50% 31% 16% 49% 61% 49% 48% 39% 176% 100% 47% 29% 14% 48% 58% 50% 45% 38% 179% 100% 43% 28% 13% 46% 56% 50% 40% 39% 174% 100% 60% 37% 20% 54% 62% 56% 51% 48% 179%
- Many log messages with the keyword
ssl_type:1
inmgwd.log
Wed Aug 12 02:14:59 2020:src/disp_processor.cc:1449 (thr_id:0x83cd63500) setup_transport() returned sock:192 stat:0 ssl_type:1
Wed Aug 12 02:14:59 2020:src/disp_processor.cc:1449 (thr_id:0x825b01100) setup_transport() returned sock:354 stat:0 ssl_type:1
Wed Aug 12 02:14:59 2020:src/disp_processor.cc:1449 (thr_id:0x83cd63500) setup_transport() returned sock:252 stat:0 ssl_type:1
Wed Aug 12 02:14:59 2020:src/disp_processor.cc:1449 (thr_id:0x825b01100) setup_transport() returned sock:246 stat:0 ssl_type:1
Wed Aug 12 02:14:59 2020:src/disp_processor.cc:1449 (thr_id:0x82e327200) setup_transport() returned sock:297 stat:0 ssl_type:1
Wed Aug 12 02:14:59 2020:src/disp_processor.cc:1449 (thr_id:0x83989b300) setup_transport() returned sock:197 stat:0 ssl_type:1