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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple style='tab-interval:36.0pt'><div class=WordSection1><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I am looking to upgrade, re-install etc. <o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I started off thinking I am looking to get a new machine, to replace one of my current systems. I have two main Myth boxes. I recently had to replace my backend motherboard and processors after the PSU died, and took the MB and CPU with it. MB and processor type changed, and I am now having issues. The disk system did not really change at this point (replaced hardware raid card exactly).<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Prior to the change, I had the master backend, and this has the most storage,<span style='mso-spacerun:yes'> </span>3 DVB-T tuners (USB) and can record 6 streams quite happily. <o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>A backend and FE combo, with DVB-S can record two streams and play another HD well.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Since having to replace the master backend I have had issues with the USB-DVB modules failing, and locking out the backend process, specifically when there is high IO load going on. I think that the motherboard might not handle high IO well (it is an Intel CPU). <o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Once the MBE dies/deadlocks, then no more recordings happen, even on the working SBE.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I am wondering about a couple of choices now for replacing the MBE. One driver behind the choice, is that I would like the MBE (i.e. the BE that does the scheduling…) to be separate from the BE that uses the USB modules.<o:p></o:p></span></font></p><p class=MsoNormal><s><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p><span style='text-decoration:none'> </span></o:p></span></font></s></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I prefer Fedora based systems, if that is going to make much difference to the answers (I also <s>like</s> prefer to compile the source).<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>One choice would be a Xen setup, NFS storage exported from either dom0 or a domU. Then the MBE can run (USB can be passed-through?) in a domU. Or even, I could have 3 domUs and reboot one if one fails.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>However, there appeared to be a bit of a downer on Xen in this list? (looking at gossamer threads). <o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>People suggested that instead of using Xen, it would make sense to use a chroot environment for process separation. The times and scenarios in which I read this, it did make sense (someone wanting to keep Samba away from myth for example). <o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>However, in my case, I believe that a chroot will not suffice, as the kernel module crashing will mean that I will need to reboot the server in order to re-insert the module (unfortunately, stopping the BE doesn’t always work (not even kill -9) and in those times a reboot, or reboot –fn doesn’t always work either). If I can stop the BE, then rmmoding the kernel module, unplugging the devices, and then re-inserting has only worked once.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I see three answers, but I only really like the Xen one. Can anyone else suggest some alternatives?<o:p></o:p></span></font></p><p class=MsoListParagraph style='margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font size=2 face=Calibri><span style='font-size:11.0pt;mso-bidi-font-family:Calibri'><span style='mso-list:Ignore'>1)<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>Separated machines – cons - requires extra machine, more difficult obtaining ‘budget’ than replacing/upgrading – requires more power, more network, and somewhere to put it.<o:p></o:p></p><p class=MsoListParagraph style='margin-left:90.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><font size=2 face=Calibri><span style='font-size:11.0pt;mso-bidi-font-family:Calibri'><span style='mso-list:Ignore'>a.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>VLP MBE, basically no storage, runs MBE only. Is the processor capability going to be an issue?<o:p></o:p></p><p class=MsoListParagraph style='margin-left:90.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><font size=2 face=Calibri><span style='font-size:11.0pt;mso-bidi-font-family:Calibri'><span style='mso-list:Ignore'>b.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>BE with DVB-tuners<o:p></o:p></p><p class=MsoListParagraph style='margin-left:90.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><font size=2 face=Calibri><span style='font-size:11.0pt;mso-bidi-font-family:Calibri'><span style='mso-list:Ignore'>c.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>BE with DVB-S tuner(s)<o:p></o:p></p><p class=MsoListParagraph style='margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font size=2 face=Calibri><span style='font-size:11.0pt;mso-bidi-font-family:Calibri'><span style='mso-list:Ignore'>2)<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>Chroot environment – pros – easy setup. Little IO reduction. – cons – if the kernel module fails, the whole machine might still crash, or need to be rebooted.<o:p></o:p></p><p class=MsoListParagraph style='margin-left:90.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><font size=2 face=Calibri><span style='font-size:11.0pt;mso-bidi-font-family:Calibri'><span style='mso-list:Ignore'>a.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>MBE server, has 4 chroot environments, 1 runs MBE without tuner, 4 run separated chroots with 1 DBV-T tuner each. <o:p></o:p></p><p class=MsoListParagraph style='margin-left:90.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><font size=2 face=Calibri><span style='font-size:11.0pt;mso-bidi-font-family:Calibri'><span style='mso-list:Ignore'>b.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>BE with DVB-S tuner<o:p></o:p></p><p class=MsoListParagraph style='margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font size=2 face=Calibri><span style='font-size:11.0pt;mso-bidi-font-family:Calibri'><span style='mso-list:Ignore'>3)<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>Xen setup. – pros – each OS is separated, in theory a kernel module failure will not result in all machines crashing. – Also updates/upgrades could be easily managed. – cons – more difficult to set up. Asking wife to turn machine on and off again is no longer an option<o:p></o:p></p><p class=MsoListParagraph style='margin-left:90.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><font size=2 face=Calibri><span style='font-size:11.0pt;mso-bidi-font-family:Calibri'><span style='mso-list:Ignore'>a.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>MBE has 4 (or 5) Xen environments. 1 environment has MBE no tuners. 3 domU with MBE and 1 pass-through USB for each dom0<o:p></o:p></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Better ideas anyone?<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Thanks<o:p></o:p></span></font></p></div></body></html>