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Operating Systems
AIX
Sizing p7 systems
Post 302468812 by zxmaus on Wednesday 3rd of November 2010 10:22:27 PM
11-03-2010
Moderator
Hi Zaxxon,
what kind of apps are you running (DBs, Websphere ...) and are your p5 virtualized or capped
And will your cpu pool be generous or rather low.
I am doing the a lot of sizing for my company - at the moment we are consolidating 38 small p5 frames (550/570ies) into 4 780ies ... what I find is that from a pure performance perspective a few rules of thumb still work perfectly fine - we have generous pools so I do not really care about cpu entitlements when I do the initial setup. If I have a sybase DB, I use one virtual per engine (backup server and repserver count as engines) + 1 as count for virtual cpus, on Oracle I am checking how many parallel processes (not connections) I have running on the server I want to migrate - that will be the amount of parallel threads I want to allow on the new box too - 1 virtual = 4 threads + 1 virtual for the OS. My virtuals are generally worth 0.1 physical cpu - as they can grow to a physical cpu during peaks that is just fine - what is not needed goes back into the pool. Monitor about 4 weeks after go live closely and than amend the amount of entitled cpu to what you usually need (so in average, NOT during peaks) and that is what they get permanently. Regarding memory - well its pretty much the same.
For websphere boxes we usually go with half as many virtuals as we were using on p5. Again - monitor closely and amend if required.
In my experience you have usually a lot of cpus in the pool and most frames do not have the peak times of all their lpars same time so you should usually be good.
For DBs you can go if you like as well another way: p5 to p6 = 3:2, p5 to p7 = 7:4 - that is what our engineering came up with - they assume high frame usage and small pool
I have the official IBM numbers in the office - can post tomorrow ...
Hope that helps
regards
zxmaus
what kind of apps are you running (DBs, Websphere ...) and are your p5 virtualized or capped
And will your cpu pool be generous or rather low.I am doing the a lot of sizing for my company - at the moment we are consolidating 38 small p5 frames (550/570ies) into 4 780ies ... what I find is that from a pure performance perspective a few rules of thumb still work perfectly fine - we have generous pools so I do not really care about cpu entitlements when I do the initial setup. If I have a sybase DB, I use one virtual per engine (backup server and repserver count as engines) + 1 as count for virtual cpus, on Oracle I am checking how many parallel processes (not connections) I have running on the server I want to migrate - that will be the amount of parallel threads I want to allow on the new box too - 1 virtual = 4 threads + 1 virtual for the OS. My virtuals are generally worth 0.1 physical cpu - as they can grow to a physical cpu during peaks that is just fine - what is not needed goes back into the pool. Monitor about 4 weeks after go live closely and than amend the amount of entitled cpu to what you usually need (so in average, NOT during peaks) and that is what they get permanently. Regarding memory - well its pretty much the same.
For websphere boxes we usually go with half as many virtuals as we were using on p5. Again - monitor closely and amend if required.
In my experience you have usually a lot of cpus in the pool and most frames do not have the peak times of all their lpars same time so you should usually be good.
For DBs you can go if you like as well another way: p5 to p6 = 3:2, p5 to p7 = 7:4 - that is what our engineering came up with - they assume high frame usage and small pool
I have the official IBM numbers in the office - can post tomorrow ...
Hope that helps
regards
zxmaus
This User Gave Thanks to zxmaus For This Post:
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LEARN ABOUT X11R4
chcpu
CHCPU(8) System Administration CHCPU(8) NAME
chcpu - configure CPUs SYNOPSIS
chcpu -c|-d|-e|-g cpu-list chcpu -p mode chcpu -r|-h|-V DESCRIPTION
chcpu can modify the state of CPUs. It can enable or disable CPUs, scan for new CPUs, change the CPU dispatching mode of the underlying hypervisor, and request CPUs from the hypervisor (configure) or return CPUs to the hypervisor (deconfigure). Some options have a cpu-list argument. Use this argument to specify a comma-separated list of CPUs. The list can contain individual CPU addresses or ranges of addresses. For example, 0,5,7,9-11 makes the command applicable to the CPUs with the addresses 0, 5, 7, 9, 10, and 11. OPTIONS
-c, --configure cpu-list Configure the specified CPUs. Configuring a CPU means that the hypervisor takes a CPU from the CPU pool and assigns it to the vir- tual hardware on which your kernel runs. -d, --disable cpu-list Disable the specified CPUs. Disabling a CPU means that the kernel sets it offline. -e, --enable cpu-list Enable the specified CPUs. Enabling a CPU means that the kernel sets it online. A CPU must be configured, see -c, before it can be enabled. -g, --deconfigure cpu-list Deconfigure the specified CPUs. Deconfiguring a CPU means that the hypervisor removes the CPU from the virtual hardware on which the Linux instance runs and returns it to the CPU pool. A CPU must be offline, see -d, before it can be deconfigured. -p, --dispatch mode Set the CPU dispatching mode (polarization). This option has an effect only if your hardware architecture and hypervisor support CPU polarization. Available modes are: horizontal The workload is spread across all available CPUs. vertical The workload is concentrated on few CPUs. -r, --rescan Trigger a rescan of CPUs. After a rescan, the Linux kernel recognizes the new CPUs. Use this option on systems that do not auto- matically detect newly attached CPUs. -V, --version Display version information and exit. -h, --help Display help text and exit. RETURN CODES
chcpu has the following return codes: 0 success 1 failure 64 partial success AUTHOR
Heiko Carstens <heiko.carstens@de.ibm.com> COPYRIGHT
Copyright IBM Corp. 2011 SEE ALSO
lscpu(1) AVAILABILITY
The chcpu command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux July 2014 CHCPU(8)