Moving DataStage from SAN to NAS

lgharis · Post by **lgharis** » Mon Jun 18, 2007 2:23 pm

This is created an FYI for others who might experience this issue.

The Unix SA was copying the DataStage software and Projects as well as other filesystems from SAN disks to NAS disks. Server jobs ran just fine but Parallel jobs failed with "main program: Fatal error: Duplicate name registration for: splitsubrec, APT_SplitSubRecOperator".

It was finally determined that the filesystems were copied in such a way as to NOT create the symbolic links. Rather all of the files only were copied. After stopping the DataStage daemon again, they recopied the files and all symbolic links. Parallel jobs ran successfully after this was done.

There are many symbolic links in the PXEngine/lib directory. I am sure there are others also.

ray.wurlod · Post by **ray.wurlod** » Mon Jun 18, 2007 3:23 pm

There are many dangers inherent in moving DataStage projects without due care and diligence. Thanks for posting this particular one.

lgharis · Post by **lgharis** » Tue Nov 27, 2007 3:31 pm

Update on using NAS vs SAN.
The application was experiencing performance issues after about 3 months or so. When we all sat down and thought about it, it was determined the problems started about the time we moved to NAS. We stopped everything, including the DS daemon, and had the SA copy to necessary filesystems from NAS back to SAN. All was restarted and performance issues subsided.

It seems that SAN is recommended by the vendor. If you wish to use NAS there is apparently some special considerations involved to elminate issues. We have decided to stick with SAN.