On Sun, Sep 10, 2017 at 1:55 PM, Troels Arvin <troels@arvin.dk> wrote:

Hello,

In the settings for a storage domain, in "Advanced Options", there is an
option "Discard After Delete". The default is that the checkbox is not
set.

The documentation at
https://www.ovirt.org/develop/release-management/features/storage/discard-
after-delete/ and
https://www.ovirt.org/develop/release-management/features/storage/pass-
discard-from-guest-to-underlying-storage/
does not mention why the option is not the default. What drawback does
the "Dicard After Delete" feature have, since it's not the default?

Simply because in many cases it's not really needed. The whole purpose of discarding is to allow the underlying storage to reclaim unused space. But usually there's no need for it - you've deleted a disk, but you'd like to use this space for a different disk - there's no need to give it back to the storage (imagine file deletion in file system).

It only makes sense when the underlying storage is thin provisioned and you need the space.

--
Regards,
Troels Arvin

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