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Subject: Re: Gmirror/graid or hardware raid?
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> I also create a “do-not-remove” dataset in every zpool with 1 GB
> reserved and quota. ZFS behaves very, very badly when FULL. This give
> me a cushion when things go badly so I can delete whatever used up
> all the space … Yes, ZFS cannot delete files if the FS is completely
> FULL. I leave the “do-not-remove” dataset unmounted so that it cannot
> be used.

Wouldn't it be easier just to set a quota on the root dataset?