Netbackup Deduplication Engine takes lot of time to load into memory

7.6 should resolve you problem.

can you open a ticket?

Having recently upgraded from v7.1.0.4 to v7.5.0.5 I'm finding startup much slower now; I have a 15TB volume and I'm taking 1.5 hours to restart now.

My recommendation for system memory is you need 2GB of RAM for every 1TB of used MSDP disk.  Any less and you can suddently suffer a major drop in performance.  spoold needs to map all the fingerprints into memory and keep them there.

Hello Nicolai,

Thanks for immediate response, it was quite explanatory.
Does spoold only reads the fingerprint cache from database or it performs any other activity.

Also as and when the dedupe size is increasing the time to start spoold will also increase as it has to read more fingerprints, is this the right statement.

Thanks
Sujit

 

After deduplicate service start ,MSDP try to load 100 percentage of fingerprints into the fingerprint index cache. So MSDP need lots of memory after startup.
 

if you encount the problem,you can call symc for help. or waiting netbackup new version.

http://www.symantec.com/docs/TECH183707

This technote explain that spoold read the fingerprint cache from disk first before it become ready to write data.

4 hours sonds like really long time - It's important to understand that MSDP operation are random I/O pattern and that slow disk like SATA disk are not optimal for the job. There been many improvement is MSDP since 7.0 so if you are on a older version you may consider to upgrade. 

I think you also may find the following tech note usefull if you want to improve fingerprint loading

HOWTO: Special considerations when deploying NetBackup Media Server Deduplication on Windows systems.

http://www.symantec.com/docs/HOWTO61249