It sometimes takes a while for the space to be reclaimed.
Note that in this situation you want to delete the oldest snapshots first (leaving just the newest). If you didn't do that, delete the remaining ones too.
One of the ReadyNAS features to protect user data is bitrot protection. In short, whenever data is stored on the ReadyNAS device an additional piece of data is written. This extra data is unique to the original data stored and can be used to discover inadvertent alteration of the original data. Whenever a file is read a background check is performed to verify if the data is still consistent.
Scrubbing checks all stored data for consistency, and therefore will also discover potential errors in files that have not been accessed in a long time. If multiple hard discs are used in a RAID Array Level 1 or greater then scrubbing will also correct any errors found automatically. Scrubbing does not delete any data on the device.
I haven't done anything with my readynas yet. But There maybe some progress. For the past two days my nas has not been bugging me by email saying it's low on space. So that might be working. When the nas comes online tomorrow ( I give it Mondays off) I'll do that scrubbing and balancing you all have been suggesting to me. I'll get back you on this.
Please do let us know when/if the space comes back.
BTW, you can set up a maintenance schedule to run scrubs, balances, defrags, and disk tests on a schedule. I run each of those once every 3 months on my NAS (spreading them out over the quarter). Some run them more often, but I find once per quarter works well for me.
Also, if you don't have email alerts enabled on the NAS, I recommend that you enable them. It's useful to get early notifications when the NAS health degrades.
