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# on the server
#> lctl get_param *.*.recovery_status
obdfilter.myth-OST0004.recovery_status=
status: COMPLETE
recovery_start: 1594074852
recovery_duration: 278
completed_clients: 1/3
replayed_requests: 0
last_transno: 120259116149

# abort recovery
lctl --device myth-OST0004 abort_recovery

# Get OSC device list from the client
lctl dl

# Recover a device
lctl --device <device number or name> recover

# on the MGS: get the llog
lctl --device MGS llog_print $fsname-client
lctl --device MGS llog_print $fsname-OSTxxxx
lctl --device MGS llog_print $fsnmae-MDTxxxx

# evicting client
lctl set_param mdt.*.evict_client=<uuid>
lctl set_param mdt.<target>.evict_client=uuid:<client_uuid>" or "...=nid:<client_nid>
#or
lctl set_param mdt.*evict_client=nid:<nid>

# setting to decide whether "mdt.*evict_client=N" is only on the local MDT or on all OSTs as well
lctl set_param mdt.*.evict_tgt_nid=[0|1]"
lctl set_param mdt.$fsname-MDT0000.evict_tgt_nids=<>

#get the UUID
lctl get_param llite.*.uuid

# You can mount the device which is used for a lustre server target and inspect the configuration there
mount -t ldiskfs /dev/vdb /mnt/tmp

# get stripe information for directory
lfs getstrip -d  *

# trim file system. run on all servers
fstrim -a

#drop all the locks on the client
lctl set_param ldlm.namespaces.*.lru_size=clear

# enable fake IO. Good for performance testing
lctl set_param fail_loc=0x238