It seems US server usually has problems, other than hosting provider whats the diff between US server and EU in term of hardware and software?
We have 3 US servers
2 are in one DC in Dallas
The main server us.ozco.in has only had issues recently when the DC lost power (maybe 6 - 8 weeks ago).We did have some major issues with a rented dedicated in the early US node days(January), so I purchased a blade to co-locate with 4 quad core cpus and 48Gb ram. It runs the us.ozco.in and the Litecoin pool in seperate VMs.
us2 is a new node that is in Chicago. we have had a couple of teething problems with it, one being the UPS it was connected to was failing, these issues have been resolved.
us1 is a 2nd server in the Dallas DC it had an issue with stability after a patch was applied but "didn't take" when we worked out the issue we re-patched and its been fine since apart from the recent issue where it didn't re-sync.
The latest issue was our AU host's upstream provider was doing work on another part of their network upgrading power supplies, this was not meant to affect my host, but did. The AU server was offline for some time, when it came back online 4 of 5 mining nodes re-synced as expected, us1 could not connect and needed some work to resolve the issue, shares then transferred successfully to DB server.
We have 2 EU servers hosted at different DC's in Germany
eu.ozco.in had a few teething problems but has been good since.
eu2 had some issues but we were able to identify and fix before bringing it online.
All mining nodes had brief restarts after upgrading bitcoind to 0.6.3rc1
All mining nodes run exactly the same software (as little as possible) all have a minimum of 8Gb ram and 2 cores CPU, all use less than 4Gb ram and 25%cpu
mining nodes are on vms on varying hardware.
Yes we have had a few issues with the "US nodes", no I don't think the "US server" is doing badly
Now we have 3 nodes in US and 2 in EU
us.ozco.in used to run >1.1Thash currently 827Ghash
With staff online in EU , US and AU at different times of the clock most issues are identified and resolved quickly. The guys also have my skype and can wake me up if neccesary :/
Hope that helps