On Fri, May 22, 2009 at 12:55 AM, Shawn Walker <[email protected]> wrote:
> Doug North wrote:
>>
>> Thanks for all the help.
>>
>> It looks like it had something to do with an old snapshot having a
>> reference to the files.
>>
>> I destroyed an old BE with beadm and some old time slider snapshots and
>> tons of space was made available even though the snapshots sizes in zfs list
>> were very small 17K and so forth.  Here is the zfs list although I have
>> destroyed all the snapshots.  I am currently doing it again because I still
>> see the same result if I copy a file into the /root/iso directory and rm it.
>>  I am looking to see if the du for the entire /  mount point goes down when
>> I delete the file.  I am suspicious that it will not and that a snapshot or
>> some zfs mechanism is keeping the files around.   I will post the results
>> when it completes but it is taking quite a while to get a du of my entire
>> 80G partition.
>
> Individual snapshots might be small because they only contain data different
> from their source.  But, as long as they contain blocks referencing data
> you've removed in later snapshots, that space will continue to be "used".


yes, like it always has been with plain files on whatever fs which had
open fd's.
if you deleted them the actual space was not freed until all file
descriptor references were closed.
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