"David A. Sinck" wrote:
>
> I discovered something interesting. Both of these run as a user
> without privileges on a RH7.3 + updates box:
>
> dd if=/dev/zero of=oink
> yes 'abcdabcd' > oink
>
> Other than the contents of the file being pushed to disk, these are
> the same essential thing, right?: fill the local disk partition up.
>
> Wrong. Thank you for playing.
>
> The first one *does* fill the disk.
>
> The second one hits a filesize limit.
>
> | magnitude spare:0:267} dd if=/dev/zero of=oink
> | dd: writing to `oink': No space left on device
> | 19052521+0 records in
> | 19052520+0 records out
> | magnitude spare:1:268} df .
> | Filesystem 1k-blocks Used Available Use% Mounted on
> | /dev/hda11 10080488 9568420 0 100% /mnt/spare
> | magnitude spare:0:269} ls
> | lost+found/ oink
> | magnitude spare:0:270} rm oink
> | magnitude spare:0:271} ls /dev/one
> | ls: /dev/one: No such file or directory
> | magnitude spare:1:272} yes 'abcdabcd' > oink
> | Filesize limit exceeded
> | magnitude spare:153:273} df .
> | Filesystem 1k-blocks Used Available Use% Mounted on
> | /dev/hda11 10080488 2132044 7436376 23% /mnt/spare
>
> After a bit more thought during typing the email, we have another dd
> running in the background and wala!:
>
> | magnitude spare:0:280} ls -l
> | total 7450844
> | drwx------ 2 root root 16384 Mar 17 2002 lost+found/
> | -rw-r--r-- 1 sinck sinck 2147483647 Jan 9 06:12 oink
> | -rw-r--r-- 1 sinck sinck 5474697728 Jan 9 06:28 oink2
>
> So... a 2G file limit. What?
>
> :-)
>
> Good morning.
>
> David
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I had the same discussion on another list, so I will share the answer.
I was recording streaming media from the Internet. If I used xmms, it
would get to 2.1G and segfault. Using dd, I could create a 4 GB file.
Using mplayer, I can create a 4 GB mp3 (my current stream is 2589036544
bytes in size - clearly larger than 2.1 GB). So it is not the
filesystem - it is the application's ability to deal with large files.
xmmx cannot, mplayer can. dd can, and apparently, yes cannot.
Likewise, xmmx can play a 2.1 GB mp3, but it's display cannot handle a 4
GB mp3.
2.1 GB is the maximum size of a signed 32 bit integer. Seems strange to
me that one would use a signed integer vice an unsigned int for files,
but then, I gave up programming a long time ago.
George
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