[CentOS] claiming unsused space back

Mon Jul 31 14:24:41 UTC 2017
Johnny Hughes <johnny at centos.org>

On 07/31/2017 08:50 AM, Fred Smith wrote:
> On Mon, Jul 31, 2017 at 08:28:49AM -0500, Leroy Tennison wrote:
>> I realize this is wandering off-topic but, if you have found Debian commands, you're doing better than me.  What are they?  Also, are you allowing dd to totally fill the partition (what I have found on the web as a recommendation)?  If so, is the OS surviving acceptably?
>> ----- Original Message -----
>> From: "Miguel González" <miguel_3_gonzalez at yahoo.es>
>> To: "centos" <centos at centos.org>
>> Sent: Saturday, July 29, 2017 5:11:33 AM
>> Subject: [CentOS] claiming unsused space back
>> Hi,
>>  I´m running a CentOS server in a VPS. Backups of the VPS take quite
>> much space if I don´t claim unused space.
>>  Currently I´m using dd if=/dev/zero of=/mytempfile and remove that file
>> to claim that unused space. Any automatic way of doing a similar thing
>> in CentOS? I have googled for it but I have only found Debian commands.
>>  Thanks in advance!
> I may be blind, but I don't seehow that technique can "reclaim" any space.
> all it does is fill up all the space not allocated to other files by creating
> one large file that occupies all otherwise unused disk space.
> presumably you'll delete that file once it is created, but you won't have
> any more free disk space than you had before. the only difference will be
> that that unused space will then be filled with zeroes.
> what are you actually wanting to do here?

I agree with fred .. this would OVERWRITE empty space with zeros and
remove it .. that MIGHT be something you would do for security because
it would replace what was on there before.  But it would not free up any
space and should not impact your backup at all (if you are backing up

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