ZFS Kill Your Pool With Slog

[fr33bsd]

Hi,

on ZoL I removed a slog drive during heavy load (nfs). No problems.

Few hours ago, I removed a slog from a freebsd system, I suffered destruction of the pool and stunned system: during the process of receiving an snapshot I removed the slog device of the main pool. No zfs command could be executed anymore. System reboot was impossible. It shut down until some level, but in the end the system had to be reseted hardly.

I assume removing of slog device during regular load on a pool is supported/possible in freebsd, right? I think I read it somewhere, today in the morning.

 

[Cath O'Deray]

… I assume removing of slog device during regular load on a pool is supported/possible …

I don't know about removal in that situation, but <https://cgit.freebsd.org/src/commit/?id=b93b14dc756861d543249f3d04b80809055fdd61> might be of interest.

 

[fr33bsd]

I don't know about removal in that situation, but <https://cgit.freebsd.org/src/commit/?id=b93b14dc756861d543249f3d04b80809055fdd61> might be of interest.

I am affraid, this is it. I had that issue on a freebsd 12.0 machine.
The strange thing about the incident was that there was nothing in the logs. Dmesg said nothing. No stderr output anywhere Just quite quiet dead. ?

 

[SirDice]

I had that issue on a freebsd 12.0 machine.

FreeBSD 12.0 is End-of-Life and not supported any more. Maybe upgrade to 12.2?

Unsupported FreeBSD Releases

FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms.

www.freebsd.org

 

[fr33bsd]

FreeBSD 12.0 is End-of-Life and not supported any more. Maybe upgrade to 12.2?

Unsupported FreeBSD Releases

FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms.

www.freebsd.org

I am just about to upgrade all systems to 12.2. - that's why I did all the snapshots to the other machine and just played around with slog device

Do you think that slog caused dead of the pool will not occure when trying same on 12.2 or even 13.0?