Onbar performance question

We have just started using onbar with HP OmniBack II version 3.50. The performance, compared to ontape is so horrible it is useless. This is with Informix 7.31-UC5-1 on AIX 4.3.2. I have tried several things and I finally tested this on our production machine which runs 7.30-UC7-2 and got about 10 times better performance. Still not too great. Then, on my test box, I reverted back to the 7.30 version and got comparable results (after setting BAR_DEBUG to 0). I'm getting roughly 1150KB/s which would run a long time on a large database. What I'm curious to find out is whether this is typical or if there is really something broken here. I was able to back up the test database with ontape to a local 8mm tape drive in about 5 minutes. It only has about 1.5 GB worth of data in it. Using onbar and OmniBack, it took 19 minutes (using a list of dbspace names, not onbar -w). Is this typical? I would figure the two would be closer in time than this. Any help/suggestions are appreciated. -- Jon Freeland<*> Miller Industries, Inc. Remove the "no-spam" above to reply.

I use OnBar by doing a "onbar -b -L 0". I also have the onconfig parameter BAR_MAX_BACKUP set to 0 which will then spawn as many threads as your storage manager is configured to handle. I have a remote storage manager but still use local DLT tape drives. By configuring the storage manager (Legato Networker) to run 6 threads per device, I am able to get 1gb/min throughput. I can get comparable throughputs using ontape to the DLT as well, although I can only get a single thread, obviously. By not specifying any dbspace names in the onbar command, it will spawn a thread for each dbspace (after the initial rootdbs) up to whatever max that BAR_MAX_BACKUP is set to and what the storage manager will accept. I would bet that you have something mis-configured between onbar and the storage manager. Jon Freeland wrote: > > We have just started using onbar with HP OmniBack II version 3.50. > The performance, compared to ontape is so horrible it is useless. > This is with Informix 7.31-UC5-1 on AIX 4.3.2. I have tried several > things and I finally tested this on our production machine which > runs 7.30-UC7-2 and got about 10 times better performance. Still > not too great. Then, on my test box, I reverted back to the 7.30 > version and got comparable results (after setting BAR_DEBUG to 0). > I'm getting roughly 1150KB/s which would run a long time on a large > database. What I'm curious to find out is whether this is typical or > if there is really something broken here. I was able to back up the > test database with ontape to a local 8mm tape drive in about 5 > minutes. It only has about 1.5 GB worth of data in it. Using onbar > and OmniBack, it took 19 minutes (using a list of dbspace names, > not onbar -w). Is this typical? I would figure the two would be > closer in time than this. Any help/suggestions are appreciated. > > -- > > Jon Freeland<*> > Miller Industries, Inc. > > Remove the "no-spam" above to reply.