As simple as the title suggests.
/dev/sda is a unit from
/dev/md127 - RAID1 drive.
I'm currently running a test - started a
smartctl -t long /dev/sda.
Afterwards, I started to copy files over WinSCP (SFTP) to the mounted mdadm array.
I didn't notice any performance drops, but I'm kind of not sure - not a system administrator, am just developing an automated system.
Is it safe to "use" (write/read) disk while the drive is undergoing a smartcheck? What can go wrong? Are there any drawbacks?