troubleshooting Question

Exchange 2010 - Excessive Transaction Log generation - Backup is OK.

Avatar of lapavoni
lapavoniFlag for United States of America asked on
9 Comments1 Solution6548 ViewsLast Modified:
Our Exchange 2010 SP2 server continues to generate thousands of transaction logs daily.  The database is 148GB and we have about 75 active users.  We're using Windows Server Backup currently, backing up daily to an external drive.  The backup completes fine and truncates logs as it is supposed to do.  However, by the time the backup completes, another 400-500 logs are generated (this is at 11:00pm to midnight, when there are few active users). Over the course of a day, between 3,000 and 4,000 log files are generated.

The two suspected causes of this are ActiveSync and accompanying iOS devices.  Other things I've read are mailboxes with messages stuck in the Outbox.

I've cleared all Outboxes and the problem persists.

I've removed all partnerships for iOS devices and recreated them and the problem persists (we have 30+ iPhone users).

I've run ExMON many times.  The "Log Bytes" and percent CPU does not stand out for any one (or few) users.  However, there is an entity under the "User" column with a question mark (?) that seems to be generating many megs worth of log bytes.  I presume this is a system account or process, but I don't know.

I've tried throttling EAS, to no avail.

I'm leaning toward ActiveSync being the cause because I've tried two things to mitigate the log generation.

1. I stopped the MSExchangeSyncApp pool and log generation slows down.
2. I set recycle of the pool to a one-minute increment and that seems to have marginally slowed things down.

I'm hoping there's more knowledge about this issue out there than I've found so far.  Ideas ? Suggestions ?  Thank you !!

ExMON showing excessive log bye generation by user "?"ExMON showing excessive log bye generation by user "?"ExMON showing excessive log bye generation by user "?"

Our community of experts have been thoroughly vetted for their expertise and industry experience.

Join our community to see this answer!
Unlock 1 Answer and 9 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 9 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros