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Kernel 6.19.0 has changed stuff with md devices. There's a new setting for logical_block_size (LBS) in /sys/devices/virtual/block/md*/ , and 6.19.0 will only mount md read-only where it's not configured. Also if you echo anything other than 4096 (the default) to that, you will destroy any PV you

have on that md device. I'm just glad I have a routine of backing up every night, though the restore took forever because for some reason my backup disk showed up as USB2 instead of USB3. tl;dr: Do not use 6.19.0 if you use md and LVM, the default LBS is 4096, and you can't use a kernel < 6.19.0