Why does the "not large enough to join array" error occur when trying to attach a disk to an mdadm array?

Question

linux

When you try to connect a new blank disk to the mdadm array? there is an error "not large enough to join array", it is not clear why this happens. After all, I copied the partitions with the sfdisk command, in theory the partitions should be the same...
linu

Disks of different models but the same size...

Answer 1

The section is too small. It's clearly written there.
It is possible to connect partitions of different sizes in this way only in JBOD.

Answer 2

You can use a disk of a different brand and size, but the sector-by-sector partitioning must match.
Make the partitioning of the disk manually using parted . You
can turn on the sector-by-sector geometry display via unit s.
For example, look at the geometry:

parted /dev/sda
#переключаем в сектора
unit s
#отображаем информацию
p
.....
#выход
quit

open the /dev/sdb disk and create similar partitions
after that, the partitions will be added to the raid without problems
PS - with parted if there was no work experience - carefully - it applies changes on the fly, immediately after entering the command