Currently Being ModeratedJun 4, 2012 9:00 AM (in response to Good-heart)
I can always pull memory if hardware test tells me something is wrong, but to test the modules and see if I get a crash one at a time would not be something I could do in this situation.
I also did a ton more research over the weekend and found that File Sharing in System Prefs was enabled, as was the File Sharing server in the Server app. I turned off the one in System Prefs and we'll see what happens.
I will run the hardware test to see if it shows me anything interesting if it goes down again today.
Currently Being ModeratedJun 5, 2012 8:18 AM (in response to kittonian)
All the memory is fine. The server rarely if ever goes down when there are only around 10-12 users connected. When there are 20+ users connected and working heavily it goes down often. When I say working heavily, I mean they are transferring huge files to the SAN (100GB+), sometimes 5 at a time per user, and there are a bunch of others who are reading large video files at a minimum of 220MB/sec from the SAN.
Though this worked on Snow Leopard without any issues, Lion just doesn't seem to be able to handle it. The odd thing is, on Snow Leopard there was only a single 1GB ethernet connection to a NAS system, whereas with Lion we have a much more powerful machine with a 6-port 10GB ethernet card and a 4 lane 8GB fiber card to a true SAN. You would think that the newer scenario with Lion would handle far more users with ease.
So far, very disappointing with regards to Lion's file serving performance.
Currently Being ModeratedJun 5, 2012 2:58 PM (in response to kittonian)
I hope this helps. But, Apple has confirmed a significant bug in 10.7.4 that breaks SMB. Their support says they are working on it, but they do not know when the fix will be released. It has broken SMB at all sites I support including my own location where Lion server has the updated version as well. Only AFP works. The suggestion is to restore 10.7.3 from a backup or wait until the fix is released. SMB does work - but only when admin authentication is used. Good luck!
Currently Being ModeratedJun 6, 2012 8:07 AM (in response to Kaminparis)
I appreciate the advice. We had already traced SMB as a serious problem and turned it off. This is now all happening with only a single share and only AFP enabled. It also doesn't seem to be related to how many users are connected but could still be related to significant load being placed on the box.
Whatever it is I'm at a loss because on a much slower Snow Leopard machine this worked just fine. Please keep the suggestions coming.
Currently Being ModeratedFeb 5, 2013 4:01 AM (in response to kittonian)
Did you ever come across a resolution to this?
We have a very similar problem. 10.7.4 eats all the RAM and puts it in to inactive. We have an extra 12GB on order, but after reading this post I'm not sure it will fix the issue at hand!