Messages in this thread | | | Date | Mon, 19 Mar 2001 13:59:10 -0600 | From | Charles Cazabon <> | Subject | Re: Linux should better cope with power failure |
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Otto Wyss <otto.wyss@bluewin.ch> wrote: > Lately I had an USB failure, leaving me without any access to my system > since I only use an USB-keyboard/-mouse. All I could do in that > situation was switching power off and on after a few minutes of > inactivity. From the impression I got during the following startup, I > assume Linux (2.4.2, EXT2-filesystem) is not very suited to any power > failiure or manually switching it off. Not even if there wasn't any > activity going on.
You're not using the filesystem the way you should, if you expect to be able to kill the power and not lose data.
> How could this be accomplished: > 1. Flush any dirty cache pages as soon as possible. There may not be any > dirty cache after a certain amount of idle time.
Mount the filesystem sychronously if you want this.
> 2. Keep open files in a state where it doesn't matter if they where > improperly closed (if possible).
Mount the filesystem read-only if you want this.
> 3. Swap may not contain anything which can't be discarded. Otherwise > swap has to be treated as ordinary disk space.
The kernel doesn't care about what's in swap. Fix your applications if they do.
Charles -- ----------------------------------------------------------------------- Charles Cazabon <linux@discworld.dyndns.org> GPL'ed software available at: http://www.qcc.sk.ca/~charlesc/software/ Any opinions expressed are just that -- my opinions. ----------------------------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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