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Re: Files getting clobbered when I run out of disk space [message #180109 is a reply to message #180106]

Tue, 08 January 2013 08:16

Anders Wegge Keller
Messages: 30
Registered: May 2012

Karma:

Member

faraz(at)squashclub(dot)org writes:

> There was some disk space issues with my server. As a result any script
> I had that opened a file for writing would clobber it i.e truncate it to
> zero length . Since there was no space left on device, nothing would be
> written to it.
>
> Are there any workarounds to this? Here is some code I came up, but
> it is untested as I currently have disk space on my account:
>
> /////////////////////////////
>
> function check_disk_space() {
>
> global $home_dir;
>
> $fp = fopen( "$home_dir/cgi-bin/scripts/check_disk_space" , "w" );
>
> fwrite ($fp, 'hello world' ) || die_sub ( 'Error checking for disk space' );
>
> fclose ($fp) || die_sub ( 'Error checking for disk space' );
>
> // unlink ( 'check_disk_space' );
>
> } // end functio

Use the disk_free_space() function instead. That will give you a
warning in advance, that you use to have your script send you a mail
about the situation.

You should also note that your file could end up being clobbered,
even in situations where you could write this test file. If your
payload would grow the file by more than one disk block, and there was
only one free, the dummy file would be written, but the capacity would
still be exceeded, when you write your actual data.

And finally, as have already been said: It's not the best of times to
handle a full disk, when you have data to write. It's of course better
to avoid loss of already existing data, but you really need to find a
way of avoiding a full disk in the first place.

--
/Wegge

Leder efter redundant peering af dk.*,linux.debian.*

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[Message index]

		Files getting clobbered when I run out of disk space By: faraz on Mon, 07 January 2013 23:49
		Re: Files getting clobbered when I run out of disk space By: Adam Harvey on Tue, 08 January 2013 01:07
		Re: Files getting clobbered when I run out of disk space By: Peter H. Coffin on Tue, 08 January 2013 03:47
		Re: Files getting clobbered when I run out of disk space By: Anders Wegge Keller on Tue, 08 January 2013 08:16
		Re: Files getting clobbered when I run out of disk space By: Jerry Stuckle on Tue, 08 January 2013 15:26
		Re: Files getting clobbered when I run out of disk space By: Twayne on Tue, 08 January 2013 18:01
		Re: Files getting clobbered when I run out of disk space By: M. Strobel on Tue, 08 January 2013 22:20

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