Disk I/O latency saturation troubleshooting
%util near 100 with rising await = saturated device; correlate with the noisy pid
iostat -x 1 | awk '$1!~/^$/{print $1, "util="$NF, "await="$(NF-2)}'
more troubleshooting
all 32 commands →
Per-process block I/O top
biotop-bpfcc -C 5 1
Conntrack table full check
conntrack -L 2>/dev/null | wc -l; conntrack -S
Conntrack live events
conntrack -E -p tcp --dport 443 -o timestamp
Ephemeral port exhaustion
ss -tan state time-wait | wc -l; sysctl net.ipv4.ip_local_port_range
Socket summary stats
ss -s; ss -tan state syn-sent | wc -l