JATOS on DigitalOcean : problem reaching JATOS homepage / single experiment
we are using a 2GB, 50GB SSD DigitalOcean droplet (docker-ubuntu-s-1vcpu-2gb-fra1-01) to launch JATOS studies for a few months so far. Everything was running smoothly until the last two days when experiment links started to load really slow (1-2 minutes) and sometimes the link couldn't be reached at all. I also have problems reaching our JATOS server homepage. We are currently having about 20 uploaded studies, with approximately 60-200 participants in the databases, and General Multiple Worker running on all studies.
I am wondering is it too much for the memory of the droplet we had chosen? We had even more uploaded studies (around 30), and their datasets were almost empty. Deleting those studies didn't help much with this problem, and I'm not sure whether I should delete collected data (ofc after backup :D) in order to run studies smoothly again? The other option is resizing the droplet, but I'm not sure if conducting that action going to delete all the studies and data collected.
I also tried to analyse the usage graphs on my droplet: current usage differs from the days before only on disc IO activity. Read usage was lower in the days before and now is similar to write usage (around 15 mb/s). I'm not sure whether this indicates that more deleting should be done?
I would really appreciate some help with this issue, I hope that there is some simple solution which I cannot see due to lack of knowledge about servers. :)
Thank you very much everyone in advance!