System with 12 CPUs will not boot
in [General Linux]
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From: mjt on 10 Jul 2010 18:18 On Sat, 10 Jul 2010 20:59:28 +0000 (UTC) Rahul <nospam(a)nospam.invalid> wrote: > mjt <myswtestYOURSHOES(a)gmail.com> wrote in > news:20100710114742.6fbc20fa(a)stimpy.site: > > > You're unaware of sysadmin certifications? Interesting. > But is every good sysadmin you know certified? Conversely, how much > do you trust these certifications? In my view, system administration > is still very much of an art and some of the best sys-admins that I > know have no real certificate or degree to speak of. Well, if you look in the US job market, say, for a sysadmin position on careerbuilder or monster, most all of them, under the "requirements" section, you will see, "must have XXXX certification". Now yes, I agree there are going to be people who can pick up a Linux book, study it, then take a certification exam (those who are good at test-taking) and pass, but that doesn't necessarily make them a good sysadmin. Sysadmins have to be good on their feet and have some of the more important aspects of what it means to be a good sysadmin, specifically troubleshooting. Knowing how to change file permissions or knowing which command is used to "concatenate and print files in reverse"[1], doesn't a sysadmin make. So when an issue arises, it's understanding what the underlying cause may be - many times it's never what you assume it to be. > One of the key points I've noticed is the wide diversity of > backgrounds and education that sys-admins come from. It is really > hard to predict what sort of training will make a good sys-admin. Same with programmers. Some of the most talented programmers I know don't even have a degree in MIS or CS. [1] If you're going to answer that question, answer without using Google (or any other search engine). -- "Nuclear war would mean abolition of most comforts, and disruption of normal routines, for children and adults alike." - Willard F. Libby, "You *Can* Survive Atomic Attack" <<< Remove YOURSHOES to email me >>>
From: Rahul on 10 Jul 2010 18:35 mjt <myswtestYOURSHOES(a)gmail.com> wrote in news:20100710170049.4f40d3a9 @stimpy.site: > Let's say your dept just bought a z10 EC E56 ... you better > consider working the service contract angle in there. And > if you've ever worked with a box like this, you'd understand > the importance/relevance of a contract. > Agreed. I was talking about commodity servers and commonly used packages. -- Rahul
From: Rahul on 10 Jul 2010 18:44 mjt <myswtestYOURSHOES(a)gmail.com> wrote in news:20100710171819.188df998 @stimpy.site: > So when an issue arises, it's understanding what the > underlying cause may be - many times it's never what you > assume it to be. > >> One of the key points I've noticed is the wide diversity of >> backgrounds and education that sys-admins come from. It is really >> hard to predict what sort of training will make a good sys-admin. > > Same with programmers. Some of the most talented programmers > I know don't even have a degree in MIS or CS. > Exactly. I agree with you. WHich is why I am extremely skeptical of any sys-admin certification. I doubt its relevance and its corellation with what makes a good sys-admin. More generally, I've been pretty dis- illusioned by other computer industry certifications too. What it takes to get these certifications is mostly uncorrelated with what makes a good candidate. -- Rahul
From: Rui Maciel on 11 Jul 2010 08:21 mjt wrote: > Yea, well, I'll stick with a Linux family of OS ... > > > Operating system Family share for 06/2010 > Top500 Supercomputers <snip/> Could you please explain why the Top500 list is of any relevance to any choice of OS for a particular computer? Rui Maciel
From: Man-wai Chang on 11 Jul 2010 08:48
On 7/10/2010 02:27, Ignoramus30064 wrote: > We have a server with 12 processors (one of those things with two > physical processors with 6 cores each). > > Ubuntu, by default, sees only 8 CPUs. (this applies to any version, > but this is specifically 8.04). I guess you are using an Intel CPU. It's *NOT*12 processors, but 6 cores with hyper-threading! Boot it up with a normal Ubuntu, then compile a new kernel supporting more than 6 cores via `make menuconfig`! ..config - Linux Kernel v2.6.34.1 Configuration ────────────────────────────────────────────────────────────────────────────── ┌────────────────────── Processor type and features ──────────────────────┐ │ Arrow keys navigate the menu. <Enter> selects submenus --->. │ │ Highlighted letters are hotkeys. Pressing <Y> includes, <N> excludes, │ │ <M> modularizes features. Press <Esc><Esc> to exit, <?> for Help, </> │ │ for Search. Legend: [*] built-in [ ] excluded <M> module < > │ │ ┌────^(-)─────────────────────────────────────────────────────────────┐ │ │ │ Processor family (Generic-x86-64) ---> │ │ │ │ [*] IBM Calgary IOMMU support │ │ │ │ [*] Should Calgary be enabled by default? │ │ │ │ [*] AMD IOMMU support │ │ │ │ [*] Export AMD IOMMU statistics to debugfs │ │ │ │ [ ] Configure Maximum number of SMP Processors and NUMA Nodes │ │ │ │ (4) Maximum number of CPUs │ │ │ │ [*] SMT (Hyperthreading) scheduler support │ │ │ │ [*] Multi-core scheduler support │ │ │ │ Preemption Model (Preemptible Kernel (Low-Latency Desktop)) │ │ │ │ [*] Reroute for broken boot IRQs │ │ │ └────v(+)─────────────────────────────────────────────────────────────┘ │ ├─────────────────────────────────────────────────────────────────────────┤ │ <Select> < Exit > < Help > │ └─────────────────────────────────────────────────────────────────────────┘ -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and Farce be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.34.1 ^ ^ 20:43:01 up 4:44 0 users load average: 1.00 1.02 1.00 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa |