On my larger AS/400 730 (8 processors) using an external 3590-B11 tape drive, I'm only able to backup about 165,000 IFS objects an hour... really not that big of a difference!
The IFS backup performance isn't tied to how fast your tape drive is. It may be a little more dependent on how fast your system is. However, mostly it is dependent on how many objects there are to save. There is a certain amount of processing overhead involved in getting each IFS object ready to be saved to a tape device. In the case of an IFS backup this is magnified even more because there are usually "many small" objects as opposed to "fewer large" objects.
If you were able to run your IFS save in a "restricted state" you might see some improvement due to the fact that the system doesn't have to worry about object locking. Short of that, there isn't a lot more that can currently be done to speed up a save of the IFS file system.
- I suspect that the writer did not do his math on this particular problem. What was stated was that the writer wanted to backup 30GB using an Ultrium 3 over a 10Mbps link.
The theoretical maximum throughput (per hour) that can be put over a 10Mbps link is: 10 X 3600 = 36,000 BITS per hour NOT Bytes per hour
To get the theoretical maximum number of Bytes per hour we have to divide by 8
Thus 36,000/8 = 4,500 BYTES per hour
So in getting the backup done in 3-4 hours is really quite realistic. — Graeme Gates
MORE INFORMATION ON THIS TOPIC
Visit the ITKnowledge Exchange and get answers to your backup & recovery questions fast.
Search400.com's targeted search engine: Get relevant information on backup & recovery.
Check out this Search400.com Featured Topic on 30 backup/recovery tips in 30 minutes .
Dig Deeper on Data backup, storage and retrieval on iSeries
Related Q&A from Ken Graap
Find out if log files can be omitted during a save without causing problems in a full restore. Continue Reading
The BRMS Network feature allows a BRMS system to connect to other BRMS systems via a network, and enables a user to consolidate media such as backup ... Continue Reading
The only option to correct damage preventing file journaling is to use the RCLSTG command. Continue Reading