Does anyone have documentation on the limit for database shared memory
on Red Hat AS 2.1? On AIX, I know it's 2 GB minus the segments
allocated for db2 core functionality (so about 1.7), but I need the
numbers for Linux (I've heard that it's only 1 GB). I would also
really love it if anyone knows where this is officially documented so
I can point some of the teams I'm working with to it.
Thanks,
Ember
Nov 12 '05
14  5128 
John Wheeler <j_*******@hotm ail.com> writes: That's what I read too.
You guys are right, I forgot about it and confused with other 64-bit
results that we published. I should know, the FDR has my name on it :-(
What I'd like to know for instance is if
I can install a single machine with two amd opteron processors with 32
GB of memory running db2 8.1 for (suse) 64 bit linux and create a
bufferpool of lets say 24 GB. That's what 64-bit computing is about
addressing lots of memory.
Depends on the kernel and the box. The current opteron box from IBM -
e325 has 6 dimm slots, so currently you can put 12GB of memory max using
2GB dimms. http://www-1.ibm.com/servers/eserver...more_info.html
We have tested huge bufferpools with 64-bit DB2 on other platforms, see
our latest tpc-c result on p690 which used about 800GB of memory in
bufferpools.
On amd64 platform running SLES8 we have configured and tested a 30-odd
GB bufferpool for some other work. That's not saying that bigger ones
wouldn't work, we just haven't put together a server with more memory
yet.
Regards,
--
Haider
"Haider Rizvi" <ha****@nouce.c a.ibm.com> wrote in message
news:7z******** ****@thinkhr.to rolab.ibm.com.. . <snip>
On amd64 platform running SLES8 we have configured and tested a 30-odd
GB bufferpool for some other work. That's not saying that bigger ones
wouldn't work, we just haven't put together a server with more memory
yet.
Regards,
--
Haider
To answer one of the original questions, what version and kernel level of
Red Hat is needed to run with 32 GB bufferpools (assuming 64 bit AMD and 64
bit DB2 for Linux)?
Thanks Haider, that was what I wanted to know. However it would be nice
if IBM wrote some articles about tests with these kind of configurations.
Regards,
John Wheeler
Haider Rizvi wrote: John Wheeler <j_*******@hotm ail.com> writes:
That's what I read too.
You guys are right, I forgot about it and confused with other 64-bit
results that we published. I should know, the FDR has my name on it :-(
What I'd like to know for instance is if
I can install a single machine with two amd opteron processors with 32
GB of memory running db2 8.1 for (suse) 64 bit linux and create a
bufferpool of lets say 24 GB. That's what 64-bit computing is about
addressing lots of memory.
Depends on the kernel and the box. The current opteron box from IBM -
e325 has 6 dimm slots, so currently you can put 12GB of memory max using
2GB dimms.
http://www-1.ibm.com/servers/eserver...more_info.html
We have tested huge bufferpools with 64-bit DB2 on other platforms, see
our latest tpc-c result on p690 which used about 800GB of memory in
bufferpools.
On amd64 platform running SLES8 we have configured and tested a 30-odd
GB bufferpool for some other work. That's not saying that bigger ones
wouldn't work, we just haven't put together a server with more memory
yet.
Regards,
"Mark A" <ma@switchboard .net> writes: To answer one of the original questions, what version and kernel level of
Red Hat is needed to run with 32 GB bufferpools (assuming 64 bit AMD and 64
bit DB2 for Linux)?
This test was on SLES8 (Suse Linux Enterprise Server 8) SP3. For RH,
equivalent OS will be the RHEL3 (RH Enterprise Linux ver 3). I don't
have personal experience with RHEL3 and large memories, but others may
have. I'll see what I can find out.
Regards,
--
Haider This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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