I'm not sure where to post this as I'm not seeing an Exchange 2010 forum.... but my problem for the past two weekends is one of my stores (I have four stores total) has gone offline.  The logs only show that it went off line but not why.  It isn't the exact same time but within 12 hours.  The others stay running fine.  I can put it back online easily and stays until the next weekend. I have Exchange 2010 standard.

Any place I can look off hand? 

Thanks!

Keith

Hi Keith ,

I suspect that any scheduled activity during weekend is causing this issue

Can you check when you have scheduled your full backup ?

maybe the full back up is not happening on this particular DB which causes this to dismount for some reason.

Can you filter out for any RPC latency errors on the DB's during the weekend?

Also please check if there is any scheduled scan running on the store levels during weekend ?

Thanks much for the reply! First off, I typed the wrong version... I have 2010 enterprise not standard. I will look at those things. I have thought of the backups running may be causing a problem even though I've had the same schedule for the past two years or so. But I did change the scheduled backup times about seven hours earlier than it was before. BTW... I'm using evault for backups.

Thanks again,

Keith

I suspect more  on the backup.

Also you can check on your evault logs on the last week and see if the backup job for this DB has completed.

If its not completed then the back up is causing the issue.

Good idea to check the backups, however the Application or System Logs should definitely lead you in the right direction.  So are you saying that when you check the Application and Event logs

• you have Zero Warnings or Errors?
• If so that's super odd, however next look for informational logs related to ESE that will definitely tell you when the DB is dismounted and will probably also give you some hints as to why or at least give you a pattern for date/time this occurs