Max File Limitation and other questions
On 7 dec. 2011, at 20:35, Jim Neal wrote:
I am trying to find Official IBM documentation that
explicitly answers the following questions:
1) How many TSM instances can be run per Linux Blade? ( I have been
told that there is a limit of one instance per Blade, but I don't see this
anywhere in the TSM 6.2 Server documentation)
you'll probably run into memory issues eventually. There are no hard technical limitations that I know of, apart from TCP limits that you can have a maximum of 64510 processes listening on non-priviliged ports (1025 - 65535) on a single system (actually per IP-address unless the processes listen on 0.0.0.0 like TSM does). You'll probably not be able to fit enough memory or CPUs in your box to run all of those servers at any usable performance. I'd guess that with a wintel box more that 1 TB off RAM would be a challenge, so with say 20 GB of RAM for a single instance, you'll not be able to fit more that 50 instances based on the amount of RAM you'll need, and probably if you account for at least 2 CPU cores for an instance.
2) Is there a limit to the number of files the a TSM client can back
up? ( I have found an unofficial document that specifies that TSM's HSM
product can handle about 100 Million files, but again I can't seem to locate
it in IBM's HSM documentation)
Yes there is. I've been told that there is a hard limit on the number of files that a TSM server can have backed up in it's entire lifespan. I've never heard of anybody ever running into that limit. 6.3 has been tested for 4 TB databases, with about 500 bytes in the DB for each file, that would amount to 8,000 million files, if I'm not mistaking.
3) Lastly, with regard to TSM's underlying DB2 datbase, are there
significant issues with memory management? (I have checked the DB2 APARS
up to DB2 version 9.8 and there seem to be a number of fixes for things such
as memory leaks, but I do not know how many of those apply to TSM and how
many are from general DB2 usage)
Issues as in bugs? Or issues as in BD2 is happier with more memory? More is better for real life workloads....
Thanks in advance!
Sr. TSM Administrator
U.C. Berkeley Storage and Backup Group
Met vriendelijke groeten/Kind Regards,
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