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Old 9th February 2011
J65nko J65nko is offline
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Default Delete all you like, but it won't free up space ; You've been (de)duped ...

From http://www.theregister.co.uk/2011/02..._reclaimation/

Quote:
Comment: Networker blog author Preston de Guise has pointed out a simple and inescapable fact: deleting files on a deduplicated storage volume may not free up any space.

De Guise points out that, in un-deduplicated storage: "There is a 1:1 mapping between amount of data deleted and amount of space reclaimed." Also, space reclamation is near-instantaneous. With deduplication neither need be true.
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Old 15th February 2011
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It gets even more fun in filesystems with snapshots, like ZFS. Delete a tonne of files ... and no space is freed, as those files are still referenced in previous snapshots.

Then throw compression into the mix to make it even harder to figure out how much actual disk space you have left (as in, how much data you can store).

It's certainly an interesting time to be in storage management.
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Old 15th February 2011
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Quote:
Originally Posted by J65nko View Post
Delete all you like, but it won't free up space
Heh, the first thing I though about reading that was that some daemons (postfix/apache/...) do not 'free' used files, so even after deleting files that have been used by them You still do not get the free space back because these files are locked by their processes, the only sollution is to restart these daemons to get back the free space.

After knowing that I have put /usr/local/etc/rc.d/${DAEMON} restart to cron jobs at 0:00 which solved the problem
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