On 2017-05-16, Greg Moeller <skyw...@gmail.com> wrote: > On Tuesday, May 16, 2017 at 2:07:01 PM UTC-5, Terje Mathisen wrote: >> Greg Moeller wrote: >> > On Tuesday, May 16, 2017 at 10:37:55 AM UTC-5, Greg Moeller wrote: >> >> Has anyone come across the advisability of running an enterprise-wide NTP >> >> server under an AIX LPAR? >> >> We're currently running NTP on old Intel hardware and the company policy >> >> is to refresh hardware on a regular basis. >> >> It seems a waste to buy several new servers if we could just put the NTP >> >> service on an AIX LPAR. >> > >> > I'm at a large company, serving NTP to over >1000 systems. >> > Policy is that we can't have old hardware, so they will spend several >> > thousand $$ on servers to run a single process. (we're an IBM/Lenovo >> > based shop) >> > >> > Technically, yes, this is a virtual machine, but this is on 250K$+ >> > hardware, not something like ESXi or Xen. >> > (and CPU/RAM/hardware can be dedicated to the LPAR if needed) >> > These boxes are meant for heavy lifting, the same type of frames power >> > AIX, iSeries, IBM mainframe, and Watson. >> > >> > Is there a way to test? It seems like I'm heading into the unknown here. >> > :) >> > >> There is indeed a way to test: "Just do it!" >> >> I worked for many years in a similar enviroment (large multi-national >> corporation with factories/offices in 100+ countries), our LPAR based >> AIX machines were very stable. >> >> Terje >> >> PS. I did use to run our ultimate NTP reference clock on a hand-soldered >> GPS board hanging on the side of a FreeBSD (v 4.x probably, i.e. a long >> time ago) box under my desk. >> >> A number of years later I finally got the money to do a proper job, >> that's when I setup 3-4 geo-distributed GPS-based Stratum 1 clocks (from >> 3 different vendors), with a second layer of 6+ Stratum 2 machines. >> >> The S2 machines used all of the S1 servers plus a set of vetted external >> S1 and S2 reference servers. All other internal machines used all the S2 >> servers as their configured sources. >> >> -- >> - <Terje.Mathisen at tmsw.no> >> "almost all programming can be viewed as an exercise in caching" > > Ok, I'm good with 'just do it'! :) > So, as a test. If I setup 2 servers(Physical x86 and AIX LPAR) with the same > external sources, how can I test them against one another? I've dabbled in > NTP for years but never delved far into the deeper numbers. > The best way is to attach a GPS/PPS to each of the computers, do not take time from them, but look at the time on the PPS pulse. Th fluctuation of that wil give you a feeling for the accuracy of the two methods.
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