Re: Reserving space in ext2 or ext3 for a big file.

On 3 mar, 11:22, Jean-David Beyer <jeandav...@xxxxxxxxxxx> wrote:
Andre Abrantes wrote:
Hi all.
I have the follow problem, my software need make a file with 4GB
and I need reserve space before the file generation finishs.

I do not know why you would need to do that, but here are two possibilities
for doing it.

1.) Create a partition a little bit larger than you need, and create your
file in there as needed. Do not create any other files in that partition. A
nice side-effect is that the file you create will be pretty much contiguous.

2.) use DD to copy /dev/zero to a file named as you need. Set the block size
and block count to get the number of bytes you need.

I'm testing the quota command for files, but its not works very
well in redhat7.2 for example.

I never used Red Hat Linux 7.2, but I ran RHL 7.3 for several years and
quotas worked just fine, except in the /tmp directory. Trouble there was
that the quota files got deleted on reboot, and perhaps when cron ran tmpwatch.

Exists a command to reserve a space for a file in ext2 or ext3
filesystens?

Not specifically, because, as I said before, there should be no reason to do it.



Thanks for all in advance...

André Abrantes
skype:andre.abrantes
email: andreabran...@xxxxxxxxx

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Hi Jean!
Thanks for your good explanation, but now I will be more exact.
In a computer, runs 3 software that needs each one, create a big file
with for sample, with 5GB.
For this sample again, the free space in the partition is 10GB, when
the first software check the free space with DF command, the file can
be created. If the second and third softwares check the space without
the first finishs the file creation, the second and third will start
the yours files.
With this, the free space in partition will not able to store the
files.
I want reserve the space for first file before create the file with
5GB, after this the second software can create the file and then, when
third try to create, return a message with can´t create a file.
A file with 5GB spend time to be created, but if I can reserve the
space before, the problem will be solved.

Thanks for all again... see you...
André

.

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