Running Weekly Full backup jobs to tape. Used to run just fine (finish in about 24hrs), but the past few weeks the Job rate has slowly been declining over the time of the job.
Job will start out and in the first hour or so will climb to 3000+MB/min but will steadily decrease to less than 500MB/min and the job will take 50+ hours.
Any ideas of what could be causing this?
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You can check the TN below which will give you a bit more insight into why job speeds can be slower than the theoretical maximum...
However, have you tried a restart of your media server first? Any network changes or changes to AV scans? These can impact your backup speeds too if they weren't considered during a backup run. Check the fragmentation levels on the server in question as well...
This could be caused by different data being backed up. Large files are always backed up faster than many small files due to sequential reading on the disks etc.
so if your backup basically starts with large files at the beginning and ends with may small files (like e.g. the system directories) this would be an explaination for a decreasing job rate
...to a point. If the backups were taking around 24 hours and now take 50, something has caused this. The software wouldn't suddenly become slow backing up the same data as before.
I apologize for the late response, the Symantec forums have been behaving strangely (asking me for image verification, but then not showing the image)
I don't think it has to do with file sizes due to the large difference in job time that has taken place.
Would updating my tape drive driver help anything?
Look that won't hurt to do so, along with updating your firmware. There is a DDI package you can download for your version of BE. Download it, install it and run the Device Configuration Wizard in order to install the drivers.
Your firmware package can be done by itself or through your drive manufacturer's diagnostic utility...
I had a similar issue when I had Intel (ProSet) dropped Teaming support for W2K8R2 on legacy NICs.
However I can tell you that BUE device speed starts at the maximum supported for that device and comes down to the speed that it is limited to, due to network/ bad tape/ etc.
Coming from an Arcserve background, it was the other way round - the device would start at 0 MB/min at work up to the maximum speed the device can run at.
Symantec people may want to correct me on this, but from my experiences, this is true.