Raid 5 x2, replacing HD's

Majorpayne · 18. Dezember 2017

Good Morning,

I currently have 2, 4 bay Media Probox's with 4 drives in each using USB connections. I'm looking to get 2 10 TB drives to replace my aging 2 TB drives. I'm currently using Mergefs to combine the 2 raids together into 1 large drive. I have a few questions on this. I also use duplicati so i do have backups. I tried to look at this Growing a mdadm RAID by replacing disks but that site no longer exists.

Is it as simple as removing the old drives and adding the new?
How do I make sure my files are copied over from the old drives to the new?

tkaiser · 24. Dezember 2017

Zitat von majorpayne

tried to look at this Growing a mdadm RAID by replacing disks but that site no longer exists.

If something is worth a read it is usually archived so using archive.org is always a good idea: https://web.archive.org/web/*/…-raid-by-replacing-disks/

Simply read through to get why you can't 'grow' anything if you have 8 x 2TB and want to buy 2 x 10TB now (you need same count of disks). Besides that I would overthink your storage topology since 2 x RAID5 with 4 disks each in USB boxes is only a nice waste of disks but doesn't provide that much higher availability or availability at all (I know these boxes only as great so called 'single points of failure' and RAID is about avoiding those).

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