Date: Mon, 28 Mar 2016 13:39:18 -0400 From: Nikolai Lifanov <lifanov@mail.lifanov.com> To: =?UTF-8?B?Sm9zw6kgUMOpcmV6?= <fbl@aoek.com> Cc: freebsd-arm@freebsd.org Subject: Re: Official images without noatime Message-ID: <56F96C46.80705@mail.lifanov.com> In-Reply-To: <813ba9c4a1474478daa86fe685acec21@mail.yourbox.net> References: <mailman.41.1458993601.86944.freebsd-arm@freebsd.org> <4b23b28ffae59216b5dde8f28f665330@mail.lifanov.com> <813ba9c4a1474478daa86fe685acec21@mail.yourbox.net>
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On 03/28/16 11:10, José Pérez wrote: > Hello Nikolai, > > El 2016-03-26 13:32, Nikolai Lifanov escribió: >> Since we also default to SU-no-J, power failure can be quite bad >> during, say, installworld. > > Why? I see no relationship between noatime and higer or lower chances to > loose files while writing them. > A simple case is during install /usr/bin/cmp is ran to compare two files, atime for /usr/bin/cmp is updated during a crash, and /usr/bin/cmp is gone on next boot. I then have to copy it out of /usr/obj and into place and run installworld again. It's the handful of utilities actually *used* by installworld that do this and mounting root with noatime stops this from happening. >> With / noatime, I had my RPI2 lose files like /usr/bin/cmp, /bin/ls, >> and /bin/cat during a power loss. > > Bad luck. But, again, what is the relation with having or not noatime? > >> Since it's not even possible to cleanly shut down this platform, I'm >> for enabling noatime for / on >> at least for RPI and RPI2 platforms. > > My RPI2 shutdown cleanly with shutdown(8) or reboot(8). > It doesn't stay down if the power cable is still connected. It boots back up immediately, so the only way to shut mine down is to pull power on it. > Based on my experience, the less operations you do with a flash > memory, the longer it lives. Don't forget that flash is a technology > meant to store large files (images or video) for a few times over the > lifespan of a card. Throwing a live filesystem at it is, to say the least, > daring. > > Enabling journaling on flash storage shall be prohibited by law. > I may have been superstitious about journaling (Ian corrected me earlier), but disabling atime really helps these binaries stay around. > Let's read again together mount(8) > noatime > Do not update the file access time when reading from a > file. [blablabla] > > So, when you mount / with noatime, you are: > - speeding up your system > - extending the life of your flash card. > > Same chances to loose files. > > Regards, > > --- > José Pérez
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