Messages in this thread | | | Subject | Re: Large disk partition over 300GB | Date | Tue, 13 Jul 1999 10:47:29 +0200 (MEST) | From | (Rogier Wolff) |
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Miquel van Smoorenburg wrote: > In article <cistron.slrn7okoe4.l8j.marc_news@magic.merlins.org>, > Marc MERLIN <marc_news@merlins.org> wrote: > >On 10 Jul 1999 22:30:01 -0700, Jeff - <jeff9n@hotmail.com> wrote: > >>disk is about 320GB. But the file system only see roughly 265GB. Is this a > >>limitation with the kernel or the file system? It is expected that the > >>capacity of the formatted partition will be less. But in this case the loss > >>is around 55GB (~ %18) which is quite significant. > > > >Reformat your partition with: > >mke2fs -b 4096 -i 16384 -m 0 -s 1 /dev/device > > > >You may want to read the mke2fs and decide whether you want to decrease -i a > >bit and maybe set -m to 1 instead of 0. > > Ofcourse you realize that setting -m to 1 or worse, 0, will result > in a badly fragmented disk when it fills up and really bad performance.
I recommend not going below 2 or 3%. For large filesystems I think that 5% is indeed a bit much.
I have a filesystem with -m 1. (I think that... ) I know what I'm doing. That filesystem fills up to whatever I need, and then gets completely whacked again. It is NOT slowly filling up and then hoovering around the "almost full" range, like many filesystems do.
> The -b 4096 is good advice though, it should be the default on partions > bigger than 100 MB or so. -i 16384 also isn't bad if you don't plan on > storing lots (and that is _lots_) of small files.
It will be default soon. Calculate the average filesize for your intended usage. Multiply by four for a safe margin.
The guys looking for oil will for example store at most a few thousand 300Mb files on a 300Gb partition. Add in a few ten-thousands small files, and that'll be all. But maybe you're going to store millions of small (< 1k) files, In that case, the 1k blocksize is not a bad idea, and the many inodes config isn't too bad either.....
In conclusion, it pays to do the math on such VERY large filesystems.
Roger.
-- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 ** *-- BitWizard writes Linux device drivers for any device you may have! --* ------ Microsoft SELLS you Windows, Linux GIVES you the whole house ------
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