Date: Thu, 13 Apr 2000 18:22:39 -0400 From: Walter Brameld <brameld@twave.net> To: keramida@ceid.upatras.gr, Giorgos Keramidas <keramida@ceid.upatras.gr>, Wayne McAlpine <wayne.mcalpine@home.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Question Message-ID: <00041318422101.02132@Bozo_3.BozoLand.domain> In-Reply-To: <20000413164035.A25700@hades.hell.gr> References: <001f01bfa4ca$8bfee4b0$bb15fea9@1wn.com> <20000413164035.A25700@hades.hell.gr>
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On Thu, 13 Apr 2000, in a never-ending search for enlightenment, Giorgos Keramidas wrote:
> On Wed, Apr 12, 2000 at 04:00:42PM -0600, Wayne McAlpine wrote:
> > Hello,
> >
> > Would you happen to know what the maximunm amount of files and/or sub
> > directories that one can have in any single directory on a freebsd
> > ufs file system ? I'd really appreciate your response if you know the
> > answer.
>
> I suspect that for the number of files, there is no theoretical limit,
> other than the limit of the available i-nodes on your filesystem. After
> a truly huge number of files have been created in a single directory,
> performance is likely to degrade though. Perhaps it all depends on what
> will happen first: your filesystem run out of i-nodes, or performance
> gonne that way...
>
> However, for the nesting of subdirectories, there seems to be a limit.
> I tried this:
>
> $ cd /tmp
> $ while true; do mkdir 0; cd 0; sleep 0; done
>
> and waited to see whether it would stop or fill the rest of my /tmp
> partition with empty directories [yeah, i know, i like living on the
> dangerous side of the moon].
>
> It stopped several levels down, and the last directory that my shell
> (currently bash) would not give me the error:
>
> cd: could not get current directory: getcwd: cannot access
> parent directories: No such file or directory
>
> was at a depth that I could see:
>
> % pwd | wc
> 1 1 1023
>
> One level deeper, bash would not chdir, pwd would fail, etc.
> The limit seems to be that of a maximum pathname containing 1023
> characters. I suspect POSIX has something to do with this :/
>
> --
> Giorgos Keramidas, < keramida @ ceid . upatras . gr >
Please don't forget my newbie status, but after seeing this question
and a previous one on number of available inodes I thought I'd pass
this along from 'man newfs'.
The characters of interest are:
1) blocksize - Block size of the file system. The value must be a power
of 2, the default is 8192 bytes and the smallest allowable size is
4096 bytes.
2) fragsize - The fragment size of the file system. Also a power of 2
in the range of blocksize/8 and blocksize. Default is 1024 bytes.
3) bytes-per-inode. The default is to create an inode for every
(4 * fragsize) bytes of data space.
Using the command 'df -i' will show you how many inodes you have used,
and how many are still available.
--
Walter Brameld
Microsoft: Where do you want to go today?
Linux: Where do you want to go tomorrow?
BSD: Are you guys coming, or what?
Walter: And what does THIS button do??
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