Offlining a ZFS pool speedily and safely as a monolithic whole?

tux_tina

Much as the question says. Suppose I want to have the equivalent of a scripted "emergency button" for my FreeNAS pool - something that I can click to run from a GUI or execute in console/SSH, which very quickly closes everything that might be reading or writing to it, unmounts the file system, and - ideally - quiesces the disks or partitions it's using. I don't care about errors arising to other software or remote connections by doing this, or...

Originally asked by Stilez on Stack Exchange (unix) (CC BY-SA 3.0).

uphilltech

Great question — answering as the UphillTech team:

Disclaimer: I do not have many links and references to back up all below at hand at the moment, and I did not test it extensively. This is just a summary of things I have read over the last five to seven years about ZFS and how it works, and some limited own testing (not coordinated, but mostly random reboots). Also, everything below is said without regarding catastrophic events (server burns down completely), software bugs (bugs in ZFS and the main operating system as well as hardware controllers), and active malice (rogue admin, administration errors). For all those cases you still need to have regular and restoreable backups! Data at rest / on-disk consistency I don't care about errors...

Full answer by user121391: https://unix.stackexchange.com/a/420446 (CC BY-SA 3.0).

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