Not from experience....
but I would expect it to keep track of the drive by UUID and not let you
just swap them around willy nilly.
If your two drives are mirrored, I would add the spare as a mirror also.
After the system copies everything over to the new mirror, then fail out
drive B.
That would maintain the mirroring through the whole process so you don't
have a period
with just one drive.
On 5/1/19 10:28 AM, Gregory Avedissian wrote:
Current server setup is raid1 with three drives. (pair and a spare)
with lvm.
/var is on its own logical partition, and the library has outgrown the
disk.
The motherboard has four sata inputs. I want to reduce the existing
raid to two drives so I can put in two large drives and make a second
raid to hold /var.
The three existing drives are sda, sdb and sdc. I want to remove sdb
and put sdc (the spare) in its place.
The question is, what order do I do things? Which drive(s) do I fail,
and when? Can I just shut the machine down, remove sdb and plug sdc
into the second sata input? Then reboot and remove the missing sdc
from the array? Does mdadm identify the drive by its device name or by
the uuid? Will it get mad at me if I change the order of the drives?
Thanks,
Greg
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