That's it!
In the log appears
Dec 21 08:46:28 local/tmm1 warning tmm1[9309]: 011e0002:4: sweeper_update: aggressive mode activated. (174174/204800 pages)
Dec 21 08:46:30 local/tmm1 warning tmm1[9309]: 011e0002:4: sweeper_update: aggressive mode deactivated. (173655/204800 pages)
Dec 21 10:26:43 local/tmm5 warning tmm5[9313]: 011e0002:4: sweeper_update: aggressive mode activated. (174114/204800 pages)
Dec 21 10:26:44 local/tmm5 warning tmm5[9313]: 011e0002:4: sweeper_update: aggressive mode deactivated. (173436/204800 pages)
Thank you again!!!
Antonio.
SOLVED