Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Marc Van Dyck Newsgroups: comp.os.vms Subject: Re: Upcoming time boundary events Date: Wed, 04 Jun 2025 10:27:46 +0200 Organization: A noiseless patient Spider Lines: 50 Message-ID: References: <100fp4v$1nmtf$1@dont-email.me> <100omli$3t023$1@dont-email.me> <100qdop$6q13$1@dont-email.me> <100qg5t$3jb0$1@dont-email.me> <1014ad8$2jurh$1@dont-email.me> <101dnbj$omrq$1@dont-email.me> <101f0ei$1568p$1@dont-email.me> <101k5v2$39d9f$2@dont-email.me> <101n08c$23ta$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15"; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Wed, 04 Jun 2025 10:27:46 +0200 (CEST) Injection-Info: dont-email.me; posting-host="f99bd735afc02e4393ba911dd2098a9d"; logging-data="766003"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18ifiP2Y05WQAzZJONVgyos" Cancel-Lock: sha1:ba7rO+pVL+U1qjBS4RclelptzHU= X-Newsreader: MesNews/1.08.06.00-gb X-Face: #0?irvdFiM!(Tpl}/tO%_kuSW_^9G5aeIEnY1uNPcd@N_U.B30\*[%N-cnqSC,rEfeq\m:b oR({RM{x03]Iv}^2xc7\J][^MkbL3DYdLevZ$&h0WbH!i:>O1i#FLy/mO2G~xMF *uQnfN4xre8v9%0fqg;i.!ymm~6w2nEx);Q~Q*8&dUO(fn Bytes: 3581 Arne Vajhøj used his keyboard to write : > On 6/3/2025 4:25 AM, Marc Van Dyck wrote: >> Arne Vajhøj expressed precisely : >>> On 6/2/2025 4:34 AM, Marc Van Dyck wrote: >>>> Arne Vajhøj has brought this to us : >>>>> But again my impression is that often the VMS systems are in same >>>>> server room and no routing required. >>>> >>>> Several OpenVMS systems today are used in disaster-tolerant >>>> configurations. That implies at least two different locations. >>> >>> True. >>> >>> But at the risk of sounding like a broken record, that is also >>> something I got the impression is getting rarer. >>> >>> But I don't know. >>> >>> How many multi-site VMS clusters do you know? >> >> At least the one that I was in charge of before I retired last year. >> Two sites, 3 main applications, 3 production clusters, 3 other ones >> on a distant site for disaster tolerance, 3 test systems, one for >> development, two clusters for system management, and two for system >> testing/crash & burn activities. FC storage with asynchronous long >> distance replication. Backups on shared robots. Lots of fun... > > Dan just posted a question on the VSI forum about a 6 node cluster. > So clusters do exist. > > I just see very few questions related to clusters. But maybe system > managers running clusters are generally more competent than average. > > And very few need clusters for load volume leaving mostly HA reason. > > Arne Indeed. Clusters used the be a way to add compute power by horizontal scaling, because vertical scaling was either impossible or unaffordable. Today compute power is cheap, so clustering is mostly a high availability tool. With the consequence that large number of nodes have largely disappeared ; most clusters are now two or three (if you don't want a quorum disk) nodes only. I still remember the development cluster I ran 25 years ago, a large LAVC with some 50 satellites that used to take half a day to reboot... -- Marc Van Dyck