I have a client who has an SBS2011 server which decreases in performance for periods of the day.
I don't have all the specs at hand, however it's a custom built server with 16 GB ram, 3 drives in a raid 5 (Intel sata raid controller from what i'm seeing), 2 quad core xeon CPU's.
Hardly any of the SBS features are being utilised, no email, no intranet, no external access etc. They simply have a database application on the server which users connect to from client workstations, around 6 in total. The only SBS features i have disabled thus far is SharePoint & it's SQL instance.
Outside of SBS applications such as exchange/SQL etc, the only other software on the server is Symantec Endpoint Protection.
Now what happens is that during certain times of the day, most times always different, the server can become unresponsive for up to 30 seconds to a minute. If i'm logged ont he server, a snap-in etc will eventually load after roughly 1 minute, then it will hang again for another 30-60 seconds. This will continue for up to 5-10 minutes or sometimes longer, then it will begin to perform as expected again. When i eventually get task manager to launch, it looks ok as far as processor % is concerned. Memory is consumed by exchange, sql etc.
I can't seem to pinpoint what may be causing the slow down. The previous IT contractor hasn't left me much to go on, so i'm wondering if there any counters i can use, or other software that may be able to log what's going on in times of sluggishness to help troubleshoot this for me?
The clients are becoming frustrated at the speed of their software app when it's unresponsive so any advice you can give me would be most appreciated.