AIX TSM better than OS390 TSM ?
Wanda, You wrote :-
Re: AIX TSM better than OS390 TSM ?
Hi John, I should have included more caveats in that message; I didn't mean to imply that AIX performance is ALWAYS better than OS/390. You can certainly set up configurations where either OS/390 performs better, or where AIX performs better. And I am certainly not an AIX wizard, my background is primarily in OS/390 performance & storage management. In many cases, as you said, people get better performance on TSM/AIX simply because they are running the AIX TSM server on a dedicated host and don't have to fight for resources. The AIX TCP/IP stack also performs much better than the TCP/IP stack on the earlier versions of OS/390; in every release of OS/390 that is getting better. And it appears to me that AIX has a shorter code path for doing I/O than OS/390. AIX also uses all the available free memory in the box for (in OS/390 terms) I/O buffers, and the I/O just flies, even though the AIX boxes don't have the back end I/O processor hardware that mainframes do. On the other hand, many OS/390 systems benefit from having a lot of I/O paths available where you can tune and spread the I/O around, where some people order AIX boxes with just one disk I/O bus (that's a MISTAKE!), so that you eventually will hit a dead end on throughput. Now those are all just BLAZING GENERALITIES, I know -- and I'm the first to tell you that the answer to all tuning and configuration questions is: IT DEPENDS!!! My intent was just to assure the original writer that she could move TSM off her OS/390 system to AIX without worrying about giving up performance. -Original Message- From: John Naylor [mailto:[EMAIL PROTECTED]] Sent: Friday, February 21, 2003 4:04 AM To: [EMAIL PROTECTED] Subject: AIX TSM better than OS390 TSM ? Wanda, You wrote :-
Re: AIX TSM better than OS390 TSM ?
This was just the sort of discussion I was looking for. Thank you for the replies. I inherited our current TSM system 4 years ago and feel that is the best product on the market. I have never run into a problem restoring/retrieving files for clients (that wasn't user related) in all that time. But alternatives using TSM are just the kind of thing I would like to present to management. I will now do some research on AIX to see what I can come up with. As I said though, our mainframe is the most reliable server in the house. So I am wondering if you ever have problems with the AIX server crashing etc.? Is it difficult to learn how to use? In the MVS world I can write scripts and macros to use as input files to assembler programs, in this way I have automated the whole TSM backup & OFFSITE processes including reclaimation, expiration etc. The only TSM tasks the Data Center operators have to do is put ejected tapes in a box in the morning to go offsite each day. Is this something I would be able to do on a AIX system? Would you suggest a class or two of formal training? Out of all the platforms I have some knowledge of, I find NetWare the most puzzling, even though our NetWare Administrator would lay in front of a speeding train rather than switch to another platform. Does AIX have a complicated operating system? We have never had an AIX box here so my knowledge is less than nothing. I will do some research now, but any other feedback you have would be very welcome. Thanks again, Shannon
Re: AIX TSM better than OS390 TSM ?
On Saturday, Feb 22, 2003, at 04:55 Australia/Sydney, Shannon Bach wrote: reliable server in the house. So I am wondering if you ever have problems with the AIX server crashing etc.? Just from my experience, yes, like and complex piece of software, AIX can crash. I've crashed too many systems (all accidentally) to say otherwise. In all cases, IBM has either suggested an existing patch which has fixed the problem, or, in a few cases, have engineered a patch which has fixed the problem. (OK, one exception to that, we've had one rare problem that we couldn't reproduce, and couldn't provide IBM any hard debugging info to even start to look at). We have quite a few busy systems with uptimes over 500 days. Given that TSM only really stresses I/O, network, threading and VM, AIX should be rock solid on recent maintenance levels. Cheers, -- Paul Ripke Unix/OpenVMS/TSM/DBA 101 reasons why you can't find your Sysadmin: 68: It's 9AM. He/She is not working that late. -- Koos van den Hout
