Moving From 2 Exter...
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Moving From 2 External Drives (RAID 1) to Enclosure With 3 Bigger Drives

Trusted Member

I’ve currently got a Raid1 volume built on 2 external drives.

I want to move that volume to an external enclosure with 3 bigger disks and increase the volume size.


Can you confirm that this is the correct process?

install enclosure and 1 drive, certify drive, add drive to Raid1 volume as 3rd mirror 

Wait for the mirror to sync

install 2nd enclosure drive, certify

remove secondary external drive from mirror

add 2nd enclosure drive to mirror, wait for sync

make one of the enclosure drives the primary

install 3rd enclosure drive, certify

remove final external (old primary) drive from volume

add 3rd enclosure drive to mirror, wait for sync

grow volume


Topic starter Posted : 25/09/2021 12:30 pm
Member Admin

Certify all the drives at the same time. It takes the same time to certify one, as three.

Other than that, you have it understood.

Posted : 25/09/2021 12:41 pm
dgiffin liked
Trusted Member

Aaarrgh - no, it won't work, this is an APFS volume and it looks as if you can't resize those :-(

Topic starter Posted : 28/09/2021 9:27 am
Member Admin


Not yet. We are working on this for 6.1, it is not in the beta yet and I am not sure if it will make the cut.

Posted : 28/09/2021 9:50 am
Trusted Member


Topic starter Posted : 28/09/2021 10:55 am