Hi Markus,
One thing that stands out in what you pasted is the following line:
2015-11-09 11:31:45.263 [info] <0.73.0> alarm_handler:
{set,{{disk_almost_full,"/"},[]}}
Check the output of `df` and add nodes/disk as necessary to keep your disk
usage at a manageable level. Our docs recommend keeping disk use below 60%:
http://docs.basho.com/riak/latest/ops/building/planning/cluster/#Disk
Disk capacity issues can sneak up on you due to some backend operations
that require a lot of space all at once, such as Bitcask merging or AAE.
*Bad things* tend to happen to a Riak cluster with full disks, including
data loss/corruption.
Other than that, are there any changes that have been made to the
environment lately? Have you performed any upgrades recently?
Check the output of `ps aux` and kill any processes related to Riak, such
as any instances of `beam.smp` before attempting to start the node again.
If the node won't start after these troubleshooting steps, run `riak
console` which will attempt to start the node and put you into an Erlang
attach shell. Monitor the messages that are printed to stdout and if/when
it seems to hang, paste the output of the whole thing here and we can take
a look.
--
Steven Sylvester, CISSP
Client Services Engineer
Basho Technologies
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