On Tue, 22 Mar 2005, Schuett Thomas EXT wrote: > Hello, > > I am sorry for having to ask a question you might rate very stupid, > but I really want to know it: > > If you think through system crash scenarios, what types of chrashes > are you are thinking of? Do you only consider harddisk faults, or > do you consider power failures as well? I consider power failures too. In theory, you really ought to have UPS systems, *and* have them connected to the server(s) so they can monitor it and graceful shutdown, but with the best will in the world this isn't always possible. Tonight, I've had a Linux based router power cycled 3 times in a thunderstorm )-: reboot system boot 2.4.23 Wed Mar 23 20:23 (00:59) reboot system boot 2.4.23 Wed Mar 23 20:02 (01:20) reboot system boot 2.4.23 Wed Mar 23 19:57 (01:25) It's located in a open-sided barn in a farm the middle of no-where (part of a community WiFi broadband network) It has 2 x 80GB drives (it runs a squid cache amongst other stuff) which are all RAID-1 partitions. (and ext3) I used to have a UPS on it, but that fried over a year ago in another thunderstorm. Since then we've not had the money to buy a new one to replace it, so we've just suffered the odd outage and hoped for the best. > Or more extreme: Does RAID gives you savety on HD HW failures, but may > make things worse for power failures (hard power switch off)? So-far, I've not had a problem with a hard power off - on this or other routers in this network, or on other servers I have with s/w RAID. I'm not saying I'll never have a problem, but maybe so-far I've just been lucky. Gordon - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
