[ome-users] Problem with omero *downloads* from web client - nginx?

[Jake Carroll]

Hi OME crew.

I’m in need of a little bit of your help.

I’ve upgraded to 5.2.1 as of a while ago and things appeared fine on the surface, but now that everyone is back to work from the Christmas break, we’ve found a problem (and we believe it is nginx + gunicorn related).

1. Large downloads simply fail or are truncated to smaller sizes. We keep seeming to hit a magical 1.01 or 1.1GB limit when trying to download large things via the OMERO.web interface. Insight works fine, as it is unrelated to nginx.

2. We’re running the config from the OMERO 5.2.1 documentation, nginx-wise. Nginx + WSGI + gunicorn atop Ubuntu 14.04 LTS. All up to date.

3. I’ve read things about gzip compression having an impact. Tried to turn that off. No difference. I’ve read proxy_max_temp_file_size might have an impact. Fiddled with that - no difference. Fiddled with timeouts on upstream server. No difference.

4. I can’t see anything useful in the error.log or access.log for nginx, nor in the Blitz.log etc.

5. When your users are downloading 30GB+ .ims files out of OMERO regularly, this could present a problem for us, as you can appreciated ;).

Any help would be appreciated - as I’m stumped on this one. This is usually just normal administration 101 “just tune this” setting sort of thing, which doesn’t present much of a challenge - but this feels like a ghost.

Regards.

-jc