DragonFly BSD has introduced a new feature for HAMMER filesystems which will allow operations to occur, even in situations when there is not enough storage space to allow for the usual data protections. DragonFly BSD Digest explains: "As anyone who has been running HAMMER1 or HAMMER2 has noticed, snapshots and copy on write and infinite history can eat a lot of disk space, even if the actual file volume isn't changing much. There's now an emergency mode for HAMMER2, where disk operations can happen even if there isn't space for the normal history activity. It's dangerous, in that the normal protections against data loss if power is cut go away, and snapshots created while in this mode will be mangled. So definitely don't leave it on!"
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