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Currently, I have three USB drives running as a RAID-5 set on a Debian-9 server. All is well. I would like to safely move them to a different server, running Debian-10.

The host name of the current server is stored in the metadata for that RAID set. How do I change it to reflect the new server name?

Or am I better off just telling mdadm to ignore host names by using "HOMEHOST ignore" in my mdadm.conf file?

When I move the mdadm.conf file from the old server to the new one, do I leave the name= parameter alone? Or do I change it to the name of the new host?

Are there any issues with moving the RAID set from Debian 9 to Debian 10? Possible incompatibilities with the metadata?

One final question. I assume there is no guarantee that the disks on the old server, /dev/sdb, /dev/sdc, /dev/sdd, will come up with the same names on the new server. Does mdadm care?

Stephen Daniel
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  • You should not use RAID5 if data is important to you. – Tero Kilkanen Jan 31 '22 at 07:42
  • Please check out SuperUser for home setups. Even so, a RAID5 across USB drives doesn't sound like something you should be running at all if you value your data. – Mikael H Jan 31 '22 at 20:11
  • Thanks for the redirect to SuperUser. Not a platform I was aware of. – Stephen Daniel Feb 01 '22 at 12:53
  • I'm using RAID5 as the primary leg of my modified 3-2-1 data protection system for a media library. Seems perfectly appropriate to me. There is a second copy on a physically district server, backed up daily, and a third copy, off line in a fireproof lockbox, backed up monthly. While not up to "enterprise" standards, it is a low-cost way of protecting against a number of threats. – Stephen Daniel Feb 01 '22 at 12:57

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