Fault Statistics

The Fault Manager daemon, fmd, and many of its modules track statistics. The fmstat command reports those statistics. Without options, fmstat gives a high-level overview of the events, processing times, and memory usage of the loaded modules. For example:

# fmstat 
module                  ev_recv ev_acpt wait  svc_t  %w  %b  open solve  memsz  bufsz
cpumem-retire                 1       0  0.0  403.5   0   0     0     0   419b      0 
disk-transport                0       0  0.0  500.6   0   0     0     0    32b      0 
eft                           0       0  0.0    4.8   0   0     0     0   1.4M    43b 
fmd-self-diagnosis            0       0  0.0    4.7   0   0     0     0      0      0 
io-retire                     0       0  0.0    4.5   0   0     0     0      0      0 
snmp-trapgen                  0       0  0.0    4.5   0   0     0     0    32b      0 
sysevent-transport            0       0  0.0 1444.4   0   0     0     0      0      0 
syslog-msgs                   0       0  0.0    4.5   0   0     0     0      0      0 
zfs-diagnosis                 0       0  0.0    4.7   0   0     0     0      0      0 
zfs-retire                    0       0  0.0    4.5   0   0     0     0      0      0 

The fmstat(1M) man page describes each column in this output. Note that the open and solve columns apply only to Fault Management cases, which are only created and solved by diagnosis engines. These columns are immaterial for other modules, such as response agents.

You may display statistics on an individual module by using the -m module option. This syntax is commonly used with the -z option to suppress zero-valued statistics. For example:

# fmstat -z -m cpumem-retire
  NAME VALUE            DESCRIPTION
  cpu_flts 1            cpu faults resolved

This example shows that the cpumem-retire response agent has successfully processed a request to take a CPU offline.