Created attachment 615276 [details]
output of crm -d history info

sle12-a:~ # crm history info
INFO: fetching new logs, please wait ...
[1] 16:34:17 [SUCCESS] sle12-a
[2] 16:34:17 [SUCCESS] sle12-c
ERROR: append /var/cache/crm/history/psshout/sle12-a to
/var/cache/crm/history/live/sle12-a/ha-log.txt: File not open for writing
ERROR: append /var/cache/crm/history/psshout/sle12-c to
/var/cache/crm/history/live/sle12-c/ha-log.txt: File not open for writing
Source: live
...

I already used history on this host. Didn't see these messages until today.
Whatever happened in the meantime. Attaching the debug output.