We are starting to see boot device issues, or boot failures due to failed blocks. (And of course, actual failed devices, but that is simple, “must replace”.) Today, it is pretty hard to find a new, yet inexpensive but reasonable quality 16GB or 32GB SATA SSD or NVMe. So people have resorted to usin…

[image] Arwen: Today, it is pretty hard to find a new, yet inexpensive but reasonable quality 16GB or 32GB SATA SSD or NVMe. 16 GB Optane M10 NVMe are plentiful on eBay, and really cheap. There are even some 32 GB. For anything larger than 100 GB, a “copies=2” checkbox in the installer would…

Apparently someone wanted to implement this prior to any official support. So here it is: Log into your TrueNAS SCALE server as user “root” Run the following command: zfs set copies=2 boot-pool Exit out of the server exit Next TrueNAS SCALE update will take twice as much space, and be redu…

[image] Arwen: What do you think? Sounds like a good idea to me.

This Is for sure and 100% a gold tip, truenas use case are so many… Unlucky don’t fit mine. But if a request will be made for sure will have my vote

So I’ve just done this (thank you for the instructions, extremely clear and concise). Will this only apply to future files, or will Truenas no “double up” the old files as well?

[image] Krill: So I’ve just done this (thank you for the instructions, extremely clear and concise). … You are welcome. [image] Krill: … Will this only apply to future files, or will Truenas no “double up” the old files as well? Correct, only future files. This will NOT cause any ex…

Gee, I wonder if the 2 open source firewall products that use FreeBSD & OpenZFS, (pfSense & OPNsense), can also be made to use “copies=2”? Have I discovered a real, practical use for “copies=2”? Embedded uses, like smaller NAS & firewalls? That have only 1 boot device?

[image] Arwen: Have I discovered a real, practical use for “copies=2”? [image] The ZFS "copies" features is useless: Change my mind It offers error correction on a single device :wink:

I got a thrill to see that @copies-2 is still active.

[image] Arwen: Log into your TrueNAS SCALE server … Ewww. Posts in ‘General’ but makes SCALE-specific comments. What’s happened to you? Works on CORE too, but you might have a bigger problem waiting for an update. :slight_smile:

Larger single boot devices, use "copies=2"?

TrueNAS General

Stux March 2, 2025, 9:15pm 9

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Larger single boot devices, use "copies=2"?

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