Be careful. You're only comparing the upfront sticker price. If you can double or triple the capacity of your mailserver (I'll bet you can) and minimize the complexity of the solution (openmosix + vserver integration + multiple boxes (multiple points of failure) sounds very complex to me), I'll bet you find the TCO of the solution flip flop with SCSI being much lower than IDE.
A parallel example: I recently consulted with a fellow who was trying to run a 25,000 box mailserver on a series of aggregated DSL lines. It was easy work to show him that the TCO for a burstable T3 line was much lower than that of multiple DSL lines, even though the sticker price indicated the opposite. Matthew Nuzum | Makers of âElite Content Management Systemâ www.followers.net | View samples of Elite CMS in action [EMAIL PROTECTED] | http://www.followers.net/portfolio/ > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:vserver- > [EMAIL PROTECTED] On Behalf Of LuÃs Miguel Silva > Sent: Sunday, November 09, 2003 3:26 PM > To: [EMAIL PROTECTED] > Subject: RE: [Vserver] Vserver + OpenMosix... > > Hello Mat, > > I know that SCSI has better performance then IDE...but...analizing the > price it just doenst compensate! > > I can only get about 60gb SCSI disk for the price i can get a 200gb IDE > disk (more or less). > > We used to use SCSI disks but with the hdd inovations on the last years we > realised that its a waste of money > (in our case) to buy scsi! > > Thanks, > LuÃs > > -----Mensagem original----- > De: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] nome de Matthew Nuzum > Enviada: domingo, 9 de Novembro de 2003 20:12 > Para: [EMAIL PROTECTED] > Assunto: RE: [Vserver] Vserver + OpenMosix... > > > We have been working on an OpenMosix cluster in the computer club at the > school where I'm taking classes now. I've found that the server > applications that I typically use do not benefit from openmosix. The > applications commonly fall into either of two categories: > > a) I/O bound applications that only slow down when migrated to a different > node on the cluster, or > b) Applications that are incompatible with Mosix for various reasons > (threaded, shmem, device dependent etc.) such as Database software, Apache > and other server processes. > > I think the audience of people who can legitimately benefit from a > combined vserver/mosix installation is rather small. > > For those that have heavily loaded servers, why not just put fewer > vservers on a server? If 6 is too many, just do 4 or 5. If you have > extra boxes with spare cpu cycles, put the vserver there. > > Honestly, if your mailserver setup is too slow, I'm certain you can get > better performance by switching from IDE disks to SCSI. In my recent > tests, I/O tasks on IDE drives kept the CPU at about 53% utilization. > Same tests on SCSI disks used only 14% utilization with the I/O processes > taking significantly less time to complete on the SCSI. That was a system > with a single IDE drive compared to the same system with a single SCSI > drive. > > This is common knowledge among hardware people as the IDE subsystem uses > system resources for the bulk of I/O where SCSI cards were designed to > handle the I/O work much the same way a video card handles graphics work. > > Matthew Nuzum | ISPs: Make $200 - $5,000 per referral by > www.followers.net | recommending Elite CMS to your customers! > [EMAIL PROTECTED] | http://www.followers.net/isp > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:vserver- > > [EMAIL PROTECTED] On Behalf Of LuÃs Miguel Silva > > Sent: Sunday, November 09, 2003 12:18 PM > > To: [EMAIL PROTECTED] > > Subject: RE: [Vserver] Vserver + OpenMosix... > > > > Yes, my server is heavily loaded. > > I have 2 IDE disks at 7200rpm, doing raid1. > > The big load comes (mainly) from the mail server (when users use imapd > > thru the webmail). > > > > I use kernel 2.4.21 + ctx17. > > > > I really dont believe in SMP solutions. > > It is far more expensive then "setting up a cluster". > > > > In the past we (at my university) invested in dual processor boards but > > now we are convinced that it is not a $good$ $solution$ (heheh). > > > > According to the funcionality of how the openmosix kernel works (imho) > it > > would be the best solution to load balance vservers. > > > > The vserver project is great for "low'cost production servers" > > and...*SECURITY*! > > > > I think that if you would be able to get us vserver'users a > "cluster'like" > > solution...it would be the BEST "system administration" project *ever*! > > > > Best, > > +----------------------------------------- > > | LuÃs Miguel Silva > > | Network Administrator@ ISPGaya.pt > > | Rua AntÃnio Rodrigues da Rocha, 291/341 > > | Sto. OvÃdio â 4400-025 V. N. de Gaia > > | Portugal > > | T: +351 22 3745730/3/5 F: +351 22 3745738 > > | G: +351 93 6371253 E: [EMAIL PROTECTED] > > | H: http://lms.ispgaya.pt/ > > +----------------------------------------- > > -----Mensagem original----- > > De: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] nome de Herbert Poetzl > > Enviada: domingo, 9 de Novembro de 2003 16:38 > > Para: LuÃs Miguel Silva > > Cc: [EMAIL PROTECTED] > > Assunto: Re: [Vserver] Vserver + OpenMosix... > > > > > > On Sun, Nov 09, 2003 at 09:48:08AM -0000, LuÃs Miguel Silva wrote: > > > Hello everybody, > > > > > > I just thought of something! > > > How about the vserver project "united" with the openmosix project? > > > It would be great to be able to have multiple vservers enjoying > > > the cheerfull'blesses of multi'processing. > > > > let me address this separated ... > > > > > One of my servers is a X86 2.6ghz with 512Mb ram running about 6 > > > vservers and it is *totally* lagged. > > > > either your 6 servers do really hard work, which will > > bring down every system sooner or later, or your kernel > > and/or configuration is not optimal. Another reason > > could be a slow I/O (disk) and/or memory interface, > > which usual is the bottleneck nowadays ... > > > > what you could do/try: > > > > - get a recent kernel and patch rmap and maybe O(1) > > - use faster memory/disks (maybe striping, raid5) > > - add a second processor, SMP systems are much more > > resposive (smooth) with vservers > > > > > It would be great if we could balance the load thru other machines > > > (like we do with openmosix). > > > > I agree that this sounds interesting and it might be > > a viable solution to scale the vserver project beyond > > the physical limits of one MP machine ... > > > > I do not have any deeper knowledge of OpenMosix and > > no Farm where such a project could be tested/developed > > so if there is interest in doing this, we'll need both. > > > > best, > > Herbert > > > > > > > > Best, > > > +----------------------------------------- > > > | LuÃs Miguel Silva > > > | Network Administrator@ ISPGaya.pt > > > | Rua AntÃnio Rodrigues da Rocha, 291/341 > > > | Sto. OvÃdio â 4400-025 V. N. de Gaia > > > | Portugal > > > | T: +351 22 3745730/3/5 F: +351 22 3745738 > > > | G: +351 93 6371253 E: [EMAIL PROTECTED] > > > | H: http://lms.ispgaya.pt/ > > > +----------------------------------------- > > _______________________________________________ > > Vserver mailing list > > [EMAIL PROTECTED] > > http://list.linux- > > > vserver.org/mailman/listinfo/vserverÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÂÃ > > ÃzÂÅÅXÂâXÂÂ[ ÂÃÂÃXÂÂÃbÅÃÃÂÃÂÂÃÃÂÂ!ÂÃÃÃÃbÂÃÃÅ{ÂÃÃ ÂÃÂÃÅÃÃfÂâ > fÂÃXÂÂ)ÃÂÃÃzÂÃ > > _______________________________________________ > Vserver mailing list > [EMAIL PROTECTED] > http://list.linux-vserver.org/mailman/listinfo/vserver > zXX[ Xb ! b { ffX) z _______________________________________________ Vserver mailing list [EMAIL PROTECTED] http://list.linux-vserver.org/mailman/listinfo/vserver
