I use RAID1 - mirror long time. I have beleaved yet, that RAID1 does stripping on read operation for improve the speed.
While migrating form 160GB disk to 3TB mirror, I started the file copy, watching the real speed on mirrored volume as on mirror members.
I'm disappointed that all the read concerns the
/dev/sdb only while the other member is sleeping.
Do somebody know how to force the stripe-read operations on RAID1?
OS Debian Linux 9 Stretch, mdadm, ext3/4