It happened again. The log pane is again black. `top` does not show much activity on the machine. `ps -axm` produces ((see attached)). The emon.log and emon.log.1 have the same time. The attachment shows the tail of both. I've not taken any corrective action, so I can look around further as you direct me to. -- attachment begins --- The "Feed" and "Input" pages say that I found this problem 17 hours after it occurred. I collected the logs at: pi@emonpi(ro):emonhub$ date Fri 27 Oct 17:01:51 UTC 2017 Here are the processes that "emon" in their command: (not counting "daemon" processes) pi@emonpi(ro):emonhub$ ps -axm | grep emon PID TTY MAJFLT MINFLT TRS DRS SIZE SWAP RSS SHRD LIB DT COMMAND 1781 ? 10941 41520 0 47064 11766 - 4872 - - - /usr/bin/php -f /var/www/emoncms/scripts/feedwriter.php 1790 ? 18435 385373 0 237108 59277 - 196468 - - - /usr/bin/php /var/www/emoncms/scripts/phpmqtt_input.php 1898 ? 0 140 93 1814 477 - 64 - - - /bin/sh -c /home/pi/emonpi/service-runner >> /var/log/service-runner.log 2>&1 1899 ? 11804 15835382 820 5727 1637 - 1776 - - - /bin/bash /home/pi/emonpi/service-runner 7718 pts/0 0 217 165 5810 1494 - 1900 - - - grep --color=auto emon Here is the directory listing for emonhub.log: pi@emonpi(ro):emonhub$ ls -ltr total 9720 -rw-r--r-- 1 emonhub emonhub 5119853 Oct 26 23:08 emonhub.log.2 -rw-r--r-- 1 emonhub emonhub 4831337 Oct 26 23:31 emonhub.log.1 -rw-r--r-- 1 emonhub emonhub 0 Oct 26 23:31 emonhub.log pi@emonpi(ro):emonhub$ Note: those two files have the same time and are both being appended to. This is always the case recently even before the problem occurs. Note: But this time, the size of emonhub.log is zero. tailing emonhub.log.1 displays: pi@emonpi(ro):emonhub$ tail -n 100 emonhub.log emonhub.log.1 ==> emonhub.log <== ==> emonhub.log.1 <== 2017-10-26 23:09:25,752 DEBUG emoncmsorg 87253 adding frame to buffer => [1508807207.099333, 8, 9, 4, 111, 360, 121.94, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,752 DEBUG emoncmsorg 87254 adding frame to buffer => [1508807207.218646, 9, 0, 3, 10, 43, 123.16, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,752 DEBUG emoncmsorg 87255 adding frame to buffer => [1508807207.437734, 20, 15.8, 0, 68, 1.1, -43] 2017-10-26 23:09:25,753 DEBUG emoncmsorg 87256 adding frame to buffer => [1508807209.597869, 10, 109, 348, 56, 31, 120.28, 18.5, 300, 300, 300, 300, 300, 1, -45] 2017-10-26 23:09:25,753 DEBUG emoncmsorg 87257 adding frame to buffer => [1508807210.023971, 8, 8, 4, 109, 360, 121.9, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,753 DEBUG emoncmsorg 87258 adding frame to buffer => [1508807210.141335, 9, 0, 3, 9, 42, 123.01, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,754 DEBUG emoncmsorg 87259 adding frame to buffer => [1508807211.354214, 7, 0, 0, 66, 353, 122.84, 300, 300, 300, 300, 300, 300, 1, -56] 2017-10-26 23:09:25,754 DEBUG emoncmsorg 87260 adding frame to buffer => [1508807212.866893, 8, 8, 4, 109, 359, 121.89, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,754 DEBUG emoncmsorg 87261 adding frame to buffer => [1508807212.978461, 9, 0, 4, 9, 42, 123.06, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,755 DEBUG emoncmsorg 87262 adding frame to buffer => [1508807215.838186, 8, 9, 4, 111, 360, 121.85000000000001, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,755 DEBUG emoncmsorg 87263 adding frame to buffer => [1508807215.945056, 9, 0, 2, 9, 43, 123.10000000000001, 300, 300, 300, 300, 300, 300, 1, 0, -59] 2017-10-26 23:09:25,755 DEBUG emoncmsorg 87264 adding frame to buffer => [1508807216.266289, 7, 0, 0, 67, 354, 122.92, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,755 DEBUG emoncmsorg 87265 adding frame to buffer => [1508807218.702206, 8, 8, 4, 110, 361, 121.88, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,756 DEBUG emoncmsorg 87266 adding frame to buffer => [1508807218.809106, 9, 0, 3, 10, 43, 123.03, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,756 DEBUG emoncmsorg 87267 adding frame to buffer => [1508807219.54157, 10, 108, 351, 56, 31, 120.62, 18.5, 300, 300, 300, 300, 300, 1, -45] 2017-10-26 23:09:25,756 DEBUG emoncmsorg 87268 adding frame to buffer => [1508807221.169391, 7, 0, 0, 66, 354, 122.9, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,757 DEBUG emoncmsorg 87269 adding frame to buffer => [1508807221.597491, 8, 7, 6, 111, 361, 121.91, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,757 DEBUG emoncmsorg 87270 adding frame to buffer => [1508807221.713045, 9, 0, 3, 9, 43, 123.05, 300, 300, 300, 300, 300, 300, 1, 0, -59] 2017-10-26 23:09:25,757 DEBUG emoncmsorg 87271 adding frame to buffer => [1508807224.545287, 8, 9, 4, 110, 360, 121.84, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,758 DEBUG emoncmsorg 87272 adding frame to buffer => [1508807224.656248, 9, 0, 4, 8, 43, 122.98, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,758 DEBUG emoncmsorg 87273 adding frame to buffer => [1508807226.079823, 7, 0, 0, 65, 355, 122.82000000000001, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,758 DEBUG emoncmsorg 87274 adding frame to buffer => [1508807227.402701, 8, 7, 5, 111, 361, 121.79, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,759 DEBUG emoncmsorg 87275 adding frame to buffer => [1508807227.518227, 9, 0, 2, 9, 42, 123.04, 300, 300, 300, 300, 300, 300, 1, 0, -58] 2017-10-26 23:09:25,759 DEBUG emoncmsorg 87276 adding frame to buffer => [1508807230.087817, 10, 109, 352, 56, 31, 120.25, 18.5, 300, 300, 300, 300, 300, 1, -45] 2017-10-26 23:09:25,759 DEBUG emoncmsorg 87277 adding frame to buffer => [1508807230.315002, 8, 8, 5, 110, 362, 121.82000000000001, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,760 DEBUG emoncmsorg 87278 adding frame to buffer => [1508807230.46063, 9, 0, 3, 10, 43, 123.07000000000001, 300, 300, 300, 300, 300, 300, 1, 0, -59] 2017-10-26 23:09:25,760 DEBUG emoncmsorg 87279 adding frame to buffer => [1508807231.008272, 7, 0, 0, 67, 355, 122.91, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,760 DEBUG emoncmsorg 87280 adding frame to buffer => [1508807233.258313, 8, 9, 5, 110, 362, 121.88, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,760 DEBUG emoncmsorg 87281 adding frame to buffer => [1508807233.37985, 9, 0, 2, 9, 43, 123.12, 300, 300, 300, 300, 300, 300, 1, 0, -58] 2017-10-26 23:09:25,761 DEBUG emoncmsorg 87282 adding frame to buffer => [1508807233.702995, 19, 26.5, 0, 32.800000000000004, 1, -67] 2017-10-26 23:09:25,761 DEBUG emoncmsorg 87283 adding frame to buffer => [1508807234.325042, 26, 20.400000000000002, 18.7, 77.5, 2.7, 1, -60] 2017-10-26 23:09:25,761 DEBUG emoncmsorg 87284 adding frame to buffer => [1508807235.857113, 7, 0, 0, 25, 356, 122.84, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,762 DEBUG emoncmsorg 87285 adding frame to buffer => [1508807235.967055, 22, 20.5, 0, 59.6, 2.6, -55] 2017-10-26 23:09:25,762 DEBUG emoncmsorg 87286 adding frame to buffer => [1508807236.248956, 8, 8, 4, 71, 362, 121.95, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,762 DEBUG emoncmsorg 87287 adding frame to buffer => [1508807236.395029, 9, 1, 4, 10, 42, 123.11, 300, 300, 300, 300, 300, 300, 1, 0, -61] 2017-10-26 23:09:25,763 DEBUG emoncmsorg 87288 adding frame to buffer => [1508807239.030871, 8, 8, 4, 70, 362, 121.91, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,763 DEBUG emoncmsorg 87289 adding frame to buffer => [1508807239.161789, 9, 0, 3, 9, 43, 123.18, 300, 300, 300, 300, 300, 300, 1, 0, -59] 2017-10-26 23:09:25,763 DEBUG emoncmsorg 87290 adding frame to buffer => [1508807239.386047, 10, 70, 351, 56, 30, 120.63, 18.5, 300, 300, 300, 300, 300, 1, -45] 2017-10-26 23:09:25,764 DEBUG emoncmsorg 87291 adding frame to buffer => [1508807240.710036, 7, 0, 0, 26, 357, 123, 300, 300, 300, 300, 300, 300, 1, -58] 2017-10-26 23:09:25,764 DEBUG emoncmsorg 87292 adding frame to buffer => [1508807241.94355, 8, 8, 5, 69, 363, 121.89, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,764 DEBUG emoncmsorg 87293 adding frame to buffer => [1508807242.060932, 9, 0, 3, 9, 43, 123.10000000000001, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,765 DEBUG emoncmsorg 87294 adding frame to buffer => [1508807242.49426, 23, 19, 18.7, 88, 2.6, 1, -49] 2017-10-26 23:09:25,765 DEBUG emoncmsorg 87295 adding frame to buffer => [1508807244.862679, 8, 8, 6, 71, 364, 121.94, 300, 300, 300, 300, 300, 300, 1, -39] 2017-10-26 23:09:25,765 DEBUG emoncmsorg 87296 adding frame to buffer => [1508807244.979505, 9, 0, 2, 9, 42, 123.13000000000001, 300, 300, 300, 300, 300, 300, 1, 0, -59] 2017-10-26 23:09:25,766 DEBUG emoncmsorg 87297 adding frame to buffer => [1508807245.618325, 7, 0, 0, 26, 357, 122.88, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,766 DEBUG emoncmsorg 87298 adding frame to buffer => [1508807247.756127, 8, 8, 4, 70, 364, 121.84, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,766 DEBUG emoncmsorg 87299 adding frame to buffer => [1508807247.872384, 9, 0, 2, 9, 43, 123.12, 300, 300, 300, 300, 300, 300, 1, 0, -61] 2017-10-26 23:09:25,767 DEBUG emoncmsorg 87300 adding frame to buffer => [1508807249.399298, 10, 69, 355, 56, 30, 120.16, 18.5, 300, 300, 300, 300, 300, 1, -45] 2017-10-26 23:09:25,767 DEBUG emoncmsorg 87301 adding frame to buffer => [1508807250.521573, 7, 0, 0, 26, 358, 122.88, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,767 DEBUG emoncmsorg 87302 adding frame to buffer => [1508807250.669716, 8, 9, 5, 71, 364, 121.89, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,768 DEBUG emoncmsorg 87303 adding frame to buffer => [1508807250.81197, 9, 0, 4, 9, 43, 123.12, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,768 DEBUG emoncmsorg 87304 adding frame to buffer => [1508807253.566992, 8, 8, 4, 71, 364, 121.87, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,768 DEBUG emoncmsorg 87305 adding frame to buffer => [1508807253.738032, 9, 0, 2, 10, 43, 123.16, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,768 DEBUG emoncmsorg 87306 adding frame to buffer => [1508807253.989137, 24, 19.5, 19, 74.8, 2.4000000000000004, 1, -34] 2017-10-26 23:09:25,769 DEBUG emoncmsorg 87307 adding frame to buffer => [1508807255.515844, 7, 0, 0, 26, 359, 122.99000000000001, 300, 300, 300, 300, 300, 300, 1, -59] 2017-10-26 23:09:25,769 DEBUG emoncmsorg 87308 adding frame to buffer => [1508807256.536191, 8, 7, 5, 70, 365, 121.89, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,769 DEBUG emoncmsorg 87309 adding frame to buffer => [1508807256.65107, 9, 0, 3, 9, 43, 123.23, 300, 300, 300, 300, 300, 300, 1, 0, -61] 2017-10-26 23:09:25,770 DEBUG emoncmsorg 87310 adding frame to buffer => [1508807259.28191, 10, 69, 354, 54, 30, 120.25, 18.5, 300, 300, 300, 300, 300, 1, -45] 2017-10-26 23:09:25,770 DEBUG emoncmsorg 87311 adding frame to buffer => [1508807259.396461, 8, 8, 5, 70, 366, 122.04, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,770 DEBUG emoncmsorg 87312 adding frame to buffer => [1508807259.538367, 9, 0, 3, 10, 42, 123.2, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,771 DEBUG emoncmsorg 87313 adding frame to buffer => [1508807260.358664, 7, 0, 0, 25, 359, 123, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,771 DEBUG emoncmsorg 87314 adding frame to buffer => [1508807262.286832, 8, 9, 4, 70, 366, 122.14, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,771 DEBUG emoncmsorg 87315 adding frame to buffer => [1508807262.400765, 9, 0, 2, 9, 43, 123.38000000000001, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,772 DEBUG emoncmsorg 87316 adding frame to buffer => [1508807265.207291, 20, 15.8, 0, 67.9, 1, -42] 2017-10-26 23:09:25,772 DEBUG emoncmsorg 87317 adding frame to buffer => [1508807265.337706, 8, 8, 4, 69, 366, 122.14, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,772 DEBUG emoncmsorg 87318 adding frame to buffer => [1508807265.452862, 9, 0, 3, 10, 43, 123.42, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,773 DEBUG emoncmsorg 87319 adding frame to buffer => [1508807265.570319, 7, 0, 0, 26, 360, 123.28, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,773 DEBUG emoncmsorg 87320 adding frame to buffer => [1508807268.103797, 8, 8, 4, 70, 366, 122.17, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,773 DEBUG emoncmsorg 87321 adding frame to buffer => [1508807268.216641, 9, 0, 3, 9, 42, 123.39, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,774 DEBUG emoncmsorg 87322 adding frame to buffer => [1508807269.237556, 10, 69, 356, 53, 30, 120.53, 18.5, 300, 300, 300, 300, 300, 1, -45] 2017-10-26 23:09:25,774 DEBUG emoncmsorg 87323 adding frame to buffer => [1508807270.157537, 7, 0, 0, 26, 360, 123.17, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,774 DEBUG emoncmsorg 87324 adding frame to buffer => [1508807271.075124, 8, 9, 4, 70, 367, 122.21000000000001, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,775 DEBUG emoncmsorg 87325 adding frame to buffer => [1508807271.189469, 9, 0, 3, 9, 43, 123.44, 300, 300, 300, 300, 300, 300, 1, 0, -61] 2017-10-26 23:09:25,775 DEBUG emoncmsorg 87326 adding frame to buffer => [1508807273.918747, 8, 8, 4, 68, 366, 122.06, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,775 DEBUG emoncmsorg 87327 adding frame to buffer => [1508807274.036424, 9, 0, 3, 9, 43, 123.24000000000001, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,776 DEBUG emoncmsorg 87328 adding frame to buffer => [1508807275.070378, 7, 0, 0, 26, 360, 122.94, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,776 DEBUG emoncmsorg 87329 adding frame to buffer => [1508807276.838389, 8, 8, 5, 70, 366, 121.97, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,776 DEBUG emoncmsorg 87330 adding frame to buffer => [1508807276.956078, 9, 0, 4, 9, 42, 123.21000000000001, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,776 DEBUG emoncmsorg 87331 adding frame to buffer => [1508807279.1987, 10, 69, 359, 54, 30, 120.47, 18.5, 300, 300, 300, 300, 300, 1, -45] 2017-10-26 23:09:25,777 DEBUG emoncmsorg 87332 adding frame to buffer => [1508807279.716496, 8, 9, 4, 69, 367, 122.14, 300, 300, 300, 300, 300, 300, 1, -38] 2017-10-26 23:09:25,777 DEBUG emoncmsorg 87333 adding frame to buffer => [1508807279.830239, 9, 0, 2, 9, 43, 123.41, 300, 300, 300, 300, 300, 300, 1, 0, -59] 2017-10-26 23:09:25,777 DEBUG emoncmsorg 87334 adding frame to buffer => [1508807279.974264, 7, 0, 0, 25, 362, 123.19, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,778 DEBUG emoncmsorg 87335 adding frame to buffer => [1508807282.604531, 8, 7, 4, 69, 367, 122.10000000000001, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,778 DEBUG emoncmsorg 87336 adding frame to buffer => [1508807282.747896, 9, 0, 2, 9, 42, 123.31, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,778 DEBUG emoncmsorg 87337 adding frame to buffer => [1508807284.896723, 7, 0, 0, 26, 361, 123.10000000000001, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,779 DEBUG emoncmsorg 87338 adding frame to buffer => [1508807285.514827, 8, 8, 4, 70, 368, 122.22, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,779 DEBUG emoncmsorg 87339 adding frame to buffer => [1508807285.628549, 9, 0, 3, 9, 42, 123.37, 300, 300, 300, 300, 300, 300, 1, 0, -58] 2017-10-26 23:09:25,779 DEBUG emoncmsorg 87340 adding frame to buffer => [1508807288.472616, 8, 9, 4, 70, 369, 122.2, 300, 300, 300, 300, 300, 300, 1, -36] 2017-10-26 23:09:25,780 DEBUG emoncmsorg 87341 adding frame to buffer => [1508807288.589752, 9, 0, 2, 9, 42, 123.44, 300, 300, 300, 300, 300, 300, 1, 0, -58] 2017-10-26 23:09:25,780 DEBUG emoncmsorg 87342 adding frame to buffer => [1508807289.126442, 10, 68, 358, 53, 30, 120.89, 18.5, 300, 300, 300, 300, 300, 1, -45] 2017-10-26 23:09:25,780 DEBUG emoncmsorg 87343 adding frame to buffer => [1508807289.848222, 7, 0, 0, 26, 361, 122.93, 300, 300, 300, 300, 300, 300, 1, -57] 2017-10-26 23:09:25,781 DEBUG emoncmsorg 87344 adding frame to buffer => [1508807291.375925, 8, 8, 4, 69, 368, 122.11, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:25,781 DEBUG emoncmsorg 87345 adding frame to buffer => [1508807291.491892, 9, 0, 2, 9, 43, 123.39, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:25,802 DEBUG emoncmsorg 87346 adding frame to buffer => [1508807291.60512, 19, 26.5, 0, 32.7, 1, -68] 2017-10-26 23:09:25,803 DEBUG emoncmsorg 87347 adding frame to buffer => [1508807292.319956, 22, 20.5, 0, 59.6, 2.6, -54] 2017-10-26 23:09:25,804 DEBUG emoncmsorg 87348 adding frame to buffer => [1508807294.244804, 8, 8, 4, 69, 369, 122.12, 300, 300, 300, 300, 300, 300, 1, -37] 2017-10-26 23:09:26,160 DEBUG RFM2Pi 358399 NEW FRAME : OK 19 163 0 0 0 120 2 10 0 (-67) 2017-10-26 23:09:30,203 DEBUG emoncmsorg 87349 adding frame to buffer => [1508807294.387123, 9, 0, 3, 10, 42, 123.29, 300, 300, 300, 300, 300, 300, 1, 0, -60] 2017-10-26 23:09:57,095 DEBUG RFM2Pi 358399 Timestamp : 1509059365.83 2017-10-26 23:10:07,070 DEBUG emoncmsorg 87350 adding frame to buffer => [1508807294.733447, 7, 0, 0, 25, 362, 123.09, 300, 300, 300, 300, 300, 300, 1, -57] pi@emonpi(ro):emonhub$ Note: the time of the last log entry is not the time of the two files, so maybe the timestamp of the files was determined by logrotate well after the problem occured? Note: Is this log really supposed to logging every millisecond? If I look back, there is a 9 seconds of silences at 23:09:09 - :18, but otherwise this continues back to the beginning of emonhub.log.2... filling up a rotate log file in less than 12 seconds. My disk space seems fine now: pi@emonpi(ro):emonhub$ df -m Filesystem 1M-blocks Used Available Use% Mounted on /dev/root 3410 2261 984 70% / devtmpfs 481 0 481 0% /dev tmpfs 486 0 486 0% /dev/shm tmpfs 486 50 437 11% /run tmpfs 5 1 5 1% /run/lock tmpfs 486 0 486 0% /sys/fs/cgroup tmpfs 1 0 1 0% /var/lib/dhcpcd5 /dev/mmcblk0p3 194 104 81 57% /home/pi/data tmpfs 40 7 34 16% /var/lib/openhab tmpfs 50 25 26 49% /var/log tmpfs 1 0 1 0% /var/lib/dhcp /dev/mmcblk0p1 60 22 39 37% /boot tmpfs 30 1 30 1% /tmp pi@emonpi(ro):emonhub$