[Discuss] Help with I/O errors on RAID array?

[markw at mohawksoft.com (markw at mohawksoft.com)]

Don't grep for nvm, grep for errors, i.e.
dmesg | grep -i err
grep -i err /var/log/messages

If an operation reports an error, it should be in these logs.

> On October 13, 2025, markw at mohawksoft.com wrote:
>>Look at /var/log/messages and/or run "dmesg" and look for I/O errors. It
>>should show you which drive is failing.
>
> Thanks. dmesg hasn't provided any information about any disk errors so
> far:
>
>   $ sudo dmesg|grep nvm
>   [    3.279193] nvme nvme0: pci function 0000:01:00.0
>   [    3.280193] nvme nvme1: pci function 0000:43:00.0
>   [    3.286725] nvme nvme1: missing or invalid SUBNQN field.
>   [    3.286725] nvme nvme0: missing or invalid SUBNQN field.
>   [    3.287359] nvme nvme0: Shutdown timeout set to 8 seconds
>   [    3.287821] nvme nvme1: Shutdown timeout set to 8 seconds
>   [    3.316978] nvme nvme0: 32/0/0 default/read/poll queues
>   [    3.317747] nvme nvme1: 32/0/0 default/read/poll queues
>   [    3.324548]  nvme0n1: p1
>   [    3.326850]  nvme1n1: p1
>
>   $ sudo dmesg|grep -w md1
>   [    4.207982] md/raid1:md1: active with 2 out of 2 mirrors
>   [    4.223497] md1: detected capacity change from 0 to 3906762752
>   [    4.224742]  md1: p1
>
> /var/log/syslog has no errors either, except for the usual "I don't
> understand the SMART code you just sent me" errors that happen on
> every boot:
>
>   Oct 12 11:57:55 myhost smartd[2197]: Device: /dev/nvme0, number of Error
> Log entries increased from 176 to 179
>   Oct 12 11:57:55 myhost smartd[2197]: Device: /dev/nvme1, number of Error
> Log entries increased from 143 to 146
>
> Dan
>