Comments on: How Much CPU Is Enough? http://thomaslarock.com/2009/09/how-much-cpu-is-enough/ Wed, 08 Feb 2012 16:15:00 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Jane in London http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-965 Jane in London Tue, 08 Sep 2009 15:00:01 +0000 http://thomaslarock.com/?p=2802#comment-965 Just realised I never got back to you about the replication/mirroring thing (mostly because I was Doing What I Was Told at that point). In my previous position, I had a server running SQL and MIIS, and it was generally running at about 95-99% CPU, and was in perpetual danger of total collapse: SQL was taking the vast majority of that CPU, and it really needed rebooting once a week. 75% usage 75% of the time would have been rather dreamlike... Just realised I never got back to you about the replication/mirroring thing (mostly because I was Doing What I Was Told at that point).

In my previous position, I had a server running SQL and MIIS, and it was generally running at about 95-99% CPU, and was in perpetual danger of total collapse: SQL was taking the vast majority of that CPU, and it really needed rebooting once a week.

75% usage 75% of the time would have been rather dreamlike…

]]> By: Thomas LaRock http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-964 Thomas LaRock Sat, 05 Sep 2009 00:13:44 +0000 http://thomaslarock.com/?p=2802#comment-964 i would imagine the same would be true for most any line of business, with the exception of a few departments within. i would imagine the same would be true for most any line of business, with the exception of a few departments within.

]]> By: Thomas LaRock http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-963 Thomas LaRock Sat, 05 Sep 2009 00:12:48 +0000 http://thomaslarock.com/?p=2802#comment-963 not a bad guide to follow. seems simple enough especially if you know going in that you will never get it perfect. not a bad guide to follow. seems simple enough especially if you know going in that you will never get it perfect.

]]> By: Matt Silva http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-962 Matt Silva Sat, 05 Sep 2009 00:05:04 +0000 http://thomaslarock.com/?p=2802#comment-962 I simplified the problem for the sake of brevity, but in short - the 30 days are almost identical across the main line servers. The only consolidation could be with test servers - since little testing is done during the busy season. I simplified the problem for the sake of brevity, but in short – the 30 days are almost identical across the main line servers. The only consolidation could be with test servers – since little testing is done during the busy season.

]]> By: Buck Woody http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-961 Buck Woody Fri, 04 Sep 2009 23:56:07 +0000 http://thomaslarock.com/?p=2802#comment-961 Lazy Response from Buck: 75% usage for 75% of the time. THat's back from my mainframe days. Lazy Response from Buck: 75% usage for 75% of the time. THat’s back from my mainframe days.

]]> By: Thomas LaRock http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-960 Thomas LaRock Fri, 04 Sep 2009 23:41:10 +0000 http://thomaslarock.com/?p=2802#comment-960 Jack, How long would you want perfmon to collect stats for? a week? a month? a year? good question about those 30 day spikes. i suppose if you knew which 30 days you could overlay them with servers that did not spike on the same days, if possible. Jack,

How long would you want perfmon to collect stats for? a week? a month? a year?

good question about those 30 day spikes. i suppose if you knew which 30 days you could overlay them with servers that did not spike on the same days, if possible.

]]> By: Jack Corbett http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-959 Jack Corbett Fri, 04 Sep 2009 20:59:46 +0000 http://thomaslarock.com/?p=2802#comment-959 Interesting post especially because I have recently been asked by a former employer about consolidating several SQL Servers to one server for this reason. My recommendation was to get a good set of perfmon stats and then determine how many of the servers they could consolidate. I know I'd prefer to keep the average no higher than 50% just so you can handle those spikes. Matt, If you have several servers and those 30 days are all different days, could you then consolidate? Interesting post especially because I have recently been asked by a former employer about consolidating several SQL Servers to one server for this reason.

My recommendation was to get a good set of perfmon stats and then determine how many of the servers they could consolidate.

I know I’d prefer to keep the average no higher than 50% just so you can handle those spikes.

Matt,

If you have several servers and those 30 days are all different days, could you then consolidate?

]]> By: Thomas LaRock http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-958 Thomas LaRock Fri, 04 Sep 2009 18:27:56 +0000 http://thomaslarock.com/?p=2802#comment-958 why are you shouting at me? why are you shouting at me?

]]> By: Jeremiah Peschka http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-957 Jeremiah Peschka Fri, 04 Sep 2009 17:27:26 +0000 http://thomaslarock.com/?p=2802#comment-957 Our system is pretty much in use constantly, and I'd be worried if it ever went above 50% average load because that would mean that we couldn't handle a doubling in traffic. If I were running a busy website, I would probably want that number to be much lower, say around 5 to 10% because of the potential for the slashdot/digg effect taking the server down. Our system is pretty much in use constantly, and I’d be worried if it ever went above 50% average load because that would mean that we couldn’t handle a doubling in traffic. If I were running a busy website, I would probably want that number to be much lower, say around 5 to 10% because of the potential for the slashdot/digg effect taking the server down.

]]> By: Thomas LaRock http://thomaslarock.com/2009/09/how-much-cpu-is-enough/comment-page-1/#comment-956 Thomas LaRock Fri, 04 Sep 2009 16:40:41 +0000 http://thomaslarock.com/?p=2802#comment-956 yes, another good point, and also why i am leery of software the tries to tell you how to consolidate. unless that software has been in place for a year, how would you ever really have an idea about your peak usage? it would seem you are always taking a best guess estimate. yes, another good point, and also why i am leery of software the tries to tell you how to consolidate. unless that software has been in place for a year, how would you ever really have an idea about your peak usage? it would seem you are always taking a best guess estimate.

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