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indyemcuser

78 Posts

593

June 29th, 2009 12:00

0% cache, multiple logs

I have two specification on one of my servers that I noticed is having some issues. When I kick off a sync, the first spec (drive C:) runs ok to the target. But the second spec (drive E:, larger drive) does not move as well. Looking at the counters within Replistor, the Kernel cache is at 0%, but the log files are at 50 and climbing. They way I understand it is that the logs don't get created unless the cache has reached it's threshold. Why would Replistor bypass the cache and start writing logs. Since the logs are multiplying, most likely I will have to kill the sync as I will run out of space.

Thanks

dramjass

151 Posts

June 29th, 2009 12:00

The Kernel Cache probably did get used, but grew to 100% quite fast and generated Kernel Logs during the Sync.

By the time you look at it, the Kernel Cache data has already been processed.

Things to do to help this:
- Perform a Sync of the E:\ during off hours when there is the least I/O
- Perform a Sync + Attribute Compare
- Split the E:\ Spec in to multiple Spec's if possible.

indyemcuser

78 Posts

June 29th, 2009 12:00

I beleive I found the issue. It's working on a very large .ldf file. It's my guess that once it finishes caching that file in log files, the sync will continue. I will have to modify the sync job.

Thanks.

JoelStewart

24 Posts

June 30th, 2009 12:00

Once the kernel logs get cleared out over time, you should see the environment return to using the Kernel Cache for real-time replication until it becomes fully saturated.

Joel

jschrade1

106 Posts

August 25th, 2009 08:00

Another thing to watch out for is that the drive that contains the Kernel Log files should have enough free space to never run out during a Sync. If that happens, RS will automatically "recover". This means it will basically turn off Mirroring and the result is that you will need to re-sync the specifications.

You can move the Data Directory to a different drive which haas more space to compensate for this issue.

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