At Sun, 01 Mar 2009 13:57:30 +0200 Nikos Chantziaras <[email protected]> wrote:
> Peter Humphrey wrote: >> As it's Sunday, here's an odd little thing. >> >> Not long ago, while booting this machine, four ext3 partitions >> needed checks on remount count reaching zero. They had been set to >> 23, 24, 25 and 26 mounts. (I didn't choose the numbers; they were >> allocated at the time I was creating the file system.) >> >> Now, this box does get rebooted, but hardly 23 x 24 x 25 x 26 = >> 358,800 times all told. At, say, two reboots per day, that would >> take rather a long time: a little under 500 years if my arithmetic >> is working. > > I think you're confused. 23 means a check each 23 mounts. With 2 > mounts per day, that's a check every 12 days for the first and second > disk. I think the point is that 23, 24, 25, 26 are relatively prime so that, if N is initially zero, it takes 23x24x25x26 increments initially for (N mod 23), ..., (N mod 26) to all again be zero. > Also, except mount count, there's also a time-based check. The check > happens whichever of the two expires first (otherwise, a system that > gets rebooted once each two months or such would get checked in a > timely manner.) This second point is quite valid. allan
