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Posted in 2010

ANDREW CLARK — Mon, 12 Jul 2010 15:08:30 — source: IIUG Forums & Mailing Lists

I am looking for some information from the community, as to experiences running the following: Multiple Production Instances on the same hardware Informix Production Instances on a VM I am basically looking for any pros & cons. I have installed and run Informix on a VM, as have I ran multiple instances on hardware. However, this has only ever been in a Test or Development environment. I want to know is it advisable to run with these scenarios for a Production environment. I am posting this on the Linux-Informix forum, as we would only ever be running on RHEL. Thanks in advance for any assistance on this. Regards, Andrew Clark

↪ replying to ANDREW CLARK

Art Kagel — Mon, 12 Jul 2010 16:54:53 — source: IIUG Forums & Mailing Lists

Multiple instances: You have to be careful about resource contention between instances. That is the only gotcha. If both/all instances are accessing the same storage, for example, you have to be careful that the access patterns are different (day-vs-night, read-vs-write intensity, etc.) or that you calculate that the total IO requirements do not swamp the storage capacity or force cache thrashing on the subsystems. VM Multiple instances on VMs are very much like multiple instances on a single machine at the root OS except that you have some control, via the VM's resource management features, over what resources each VM has access to - how many CPU cores, how much memory, etc. The main downside to running IDS on VMs is try for all databases - IO under VMs is awful. In my own testing for a client I could not get close to the parent system's IO throughput even with a single VM running or even in aggregate across all multiple VMs. Art Art S. Kagel Advanced DataTools (www.advancedatatools.com) IIUG Board of Directors (art@iiug.org) Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on my employer, Advanced DataTools, the IIUG, nor any other organization with which I am associated either explicitly, implicitly, or by inference. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves. On Mon, Jul 12, 2010 at 11:08 AM, ANDREW CLARK < aclark@infinityhealthcare.com> wrote: > I am looking for some information from the community, as to experiences > running the following: > > Multiple Production Instances on the same hardware > > Informix Production Instances on a VM > > I am basically looking for any pros & cons. I have installed and run > Informix > on a VM, as have I ran multiple instances on hardware. However, this has > only > ever been in a Test or Development environment. I want to know is it > advisable > to run with these scenarios for a Production environment. I am posting this > on > the Linux-Informix forum, as we would only ever be running on RHEL. Thanks > in > advance for any assistance on this. > > Regards, > > Andrew Clark > > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > --000e0cdf1c12480ea2048b339c25