[mythtv-users] Recordings stay in database and on disk for some time after delete?

[Tom Dexter]

On Thu, Feb 25, 2010 at 1:41 PM, John Drescher <drescherjm at gmail.com> wrote:
> On Thu, Feb 25, 2010 at 1:21 PM, Tom Dexter <digitalaudiorock at gmail.com> wrote:
>> On Thu, Feb 25, 2010 at 12:37 PM, Greg Oliver <oliver.greg at gmail.com> wrote:
>>> On Thu, Feb 25, 2010 at 11:33 AM, John Drescher <drescherjm at gmail.com> wrote:
>>>> I have not used ext3 for my recordings for at least 4 years so I have
>>>> not had to use the slow deletes option. Since sometime in 2008 I had
>>>> begun moving my recordings from xfs to ext4 and now the datastorage
>>>> that I use daily is all ext4. I do not have any problems with ext4 and
>>>> it does not need the slow delete option.
>>>
>>> Hmmm, does that mean on a low power machine, turning off slow deletes
>>> on a disk with ext4 does not send the disk IO bound?  I have not dared
>>> try it, but it would be nice!
>>
>> I was thinking the same thing, but here's something that I'm a little
>> concerned with:
>>
>> I was just reading the Gentoo wiki about converting ext3 to ext4 where
>> the suggest unmounting the filesystem and doing:
>>
>> tune2fs -O extents,uninit_bg,dir_index /dev/device
>> ...and...
>> fsck -pf /dev/device
>> ...to make sure everything's ok.  However, they also mention this:
>> "Note: Using this method, new files will be created using the
>> "extents" method, but old files will not be automatically converted"
>>
>> If I understand correctly, the exents feature is what makes deletes
>> fast, so that tells me that deleting my older recordings would still
>> be a problem.
>>
>> I've yet to read anything about actually converting existing files to extents.
>>
>> Anyone know more about any of that?
>>
>
> I am not sure. I did not convert. I just created new filesystems and
> moved my files between my storage groups.
>
> John

Ahh...are you saying you created new empty file systems and moved the
recordings there?  If so, that would in fact create the files with
extents.

So far, I've yet to find anything about a file system utility to
convert existing files to extents on ext4.  However since new files
will have extents, anything that rewrites the entire file would
convert it.

Tom