On Mon, 14 Mar 2016 16:59:28 +1000 Noel Butler <noel.but...@ausics.net> wrote:
> On 14/03/2016 09:59, Stephan von Krawczynski wrote: > > On Mon, 14 Mar 2016 09:32:42 +1000 > > Noel Butler <noel.but...@ausics.net> wrote: > > > >> On 13/03/2016 20:47, Stephan von Krawczynski wrote: > >> > On Sun, 13 Mar 2016 09:45:06 +0000 > >> > James <li...@xdrv.co.uk> wrote: > >> > > >> >> On 11/03/2016 15:17, Stephan von Krawczynski wrote: > >> >> > >> >> > zfs set sync=disabled ? > >> >> > >> >> Only if you are happy to loose data on power failure. > >> > > >> > I don't know the actual setup, but if you have no UPC you shouldn't > >> > host email > >> > services anyway. > >> > >> I'm guessing you meant UPS, anyway, a UPS wont protect you from human > >> error. > >> > >> Also, most buildings, at least in this country, have a fire emergency > >> shutoff requirement, meaning mains is isolated from the building, and > >> the back up gennies are also forbidden to be engaged - UPS's dont last > >> forever. > > > > Guys, please don't argue on kindergarten level. The UPS is for backing > > a > > sudden death, but not for running five days. Of course you can do a > > controlled > > shutdown if battery level falls below a trigger value. And this is > > about all > > you need: control. There is no fs error as long as you perform a > > regular > > and you've never seen these cause problems with FS? then you must be a > newbie, in over 25 years I've seen it happen several times - yes even > after an apparent controlled shutdown. Maybe you're doing something wrong then. because in my last 21 years working exactly in this business I've not seen a single deadly fs-crash because of a power-outage. Not one. And we had of course several, all backed by UPS. > > shutdown. If UPS-backup is forbidden in your country then I suggest > > moving to > > civilized regions of the planet ;-) > > Now whos on kindergarten level, do you really want fireman pouring water > on fire on a level of a building thats powered up because some lamer has > a generator running? really? I'm sure those firemen would gladly hand > YOU the hose, the best UPS systems runtime we've seen under average load > for a large ISP data centre is 21 mins, usually ample time to allow the > generators to start up, come to full power, and switch in taking over > the load, but thats not going to help during a building fire, once their > depleted, their depleted. If your servers get drowned with water during a fire your fs is probably the least of your worries. You don't really plan to re-enable servers with water- or fire-damage, do you? That's probably why there shouldn't be a fireman pouring water in the first place. Please lets stop this here as it has pretty much nothing to do with dovecot... -- Regards, Stephan