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Old topic but still active situation of today. @hansm have you solve this?

Have you tried to look at dmesg / smartctl ? Try zpool clear <pool_name> This will make zfs pool to do resilvering and it may be enough for fix. Later investigate the status of the disk.

You cant transform ZFS pool from ashift 12 to 9. Just create need ZFS pool and using snapshot send data to new place.

I believe you need 6 host

Could it be cable? If it is possible try to swap drive places to see does it effect drive or the slot.

Try to read sectors and look does it return data hdparm --read-sector 512890372 /dev/sda hdparm --read-sector 76753636 /dev/sda hdparm --read-sector 821232972 /dev/sdb Another drive test is to scrub with ZFS. It will read all the written data and will validate it.

Clear ZFS pool and let it run. If the problem appear again then look it more deeply.

If you are working with critical data then you will invest into UPS, more disk for file copies and so on... For you at the moment I can suggest to disable ZFS sync ( regular and sync writes will become as regular writes) to see does it helps and If it possible rise ARC cache size. zfs set...

Welcome to ZFS. ZFS have a cache (ARC) and a cache for sync writes (LOG). Inside ARC cache you can find data cache and write cache. ZFS do not write constantly (on not heavy writes). It flush the data every 5 seconds (zfs_txg_timeout) or when dirty cache is full. Then ZFS write cache is full it...

If you think you storage drive is healthy then recreate OSD. As of now it show bad data.

Maybe your storage drive is dying. Replace it or recreate it.

Yes. Last time ( long ago ) I had to do it, the screen was refreshed with messages but typing with keyboard was accepted and process moved on.

It depend on your situation. I limit by IP address right now. Mandos server and mandos client are in different cities. You can read introduction here ( https://www.recompile.se/mandos/man/intro.8mandos ) As they say:

I run one server with full encryption except boot partition. Layout: 1. Needed partitions are encrypted with LUKS 2. ZFS use those partitions as regular partitions. I use Mandos ( https://www.recompile.se/mandos ) as tool for auto password loader from remote server at boot time before loading...

What will happens if both nodes lose connection between and both nodes continues to write locally. How you will merge differences?

I use Corsair Commander Pro to control fan speed. Of course my fans are with 4 pins.

You can create crush rules to make localized reads

My opinion: If you use system without data checksum - it is not critical system.

If you use ZFS try snapshots. If you want to use "mountpoint" in VM you can try 9p mount

If your `zpool status` report "Some supported and requested features are not enabled on the pool." then your pool is not upgraded. Or you can check in `zpool history` did upgrade was initialized. Or you can check in `zpool get all pool` enabled features and compare to documentation what was new...