action #59621
openosd: Sporadically high CPU and IO load (vdd), grafana alerts "Disk I/O time for /dev/vdd" and "CPU usage", also other disks
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Description
Observation¶
https://stats.openqa-monitor.qa.suse.de/d/WebuiDb/webui-summary?fullscreen&edit&tab=alert&panelId=23&orgId=1&from=1573686000000&to=1573732800000
shows alerting CPU usage and https://stats.openqa-monitor.qa.suse.de/d/WebuiDb/webui-summary?fullscreen&panelId=48&from=1573722000000&to=1573732800000 shows "Disk I/O time for /dev/vdd" alerting.
from chat:
all storage comes from netapp. Not sure what I/O time actually tells us. IO going up and CPU going up may just mean: we're screwed. "CPU going up" is basically a consequence of the slow IO. that's why we got the alerts. apache was roughly writing at ~100MB/s which is not that fast… . cthe highest I saw in htop was 10MB/s per httpd_prefork process. I wonder if infra monitors their virtualization host. I guess all VMs share the same path to the netapp. If this is really our bottleneck we might need to invest into separate hardware (not strictly speaking about a separate server for OSD).