mdadm force/fix proper md127 name

I have an md0 arary that my Centos install refers to.  I feel this is half the reason why it won't boot anymore.

I saw the initrd for Centos was assembling it as md127 even though it was known as md0.

The reason for this is because I used mdadm --assemble --scan to detect the array on a LiveCD.  I had no idea this name would stick (but now I realize the name is permanently stored in the metadata once you mount md127 or whatever random name assemble gives it).  Why can't mdadm read the metadata first and assemble it is as the correct name?  This will kill a live server if you access the RAID array using the scan/assemble mode, the server won't boot again until you take the corrective/action/solution below!

So back in my LiveCD I forced it to go back to md0 (now initrd reports it as md0 since doing this):

Solution - Manually Assemble the md device with the correct name and mount it

mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1

*Note that you must actually mount the md device for it to keep the new name.

I think mdadm should store some information about the name of the device and default to the original md device even if it was assembled by some LiveCD as md127.

This is one of many things that make me question how practical and well thought out mdadm really is.


Tags:

mdadm, md, namei, arary, centos, install, refers, initrd, assembling, assemble, scan, detect, array, livecd, permanently, stored, metadata, mount, server, raid, mode, corrective, manually, dev, sda, sdb, default, assembled,

Latest Articles

  • How To Stop DNSMasq from listening on all IPs/Interfaces and allow only localhost
  • du - VAS Billing Subscriptions Hack/Scam MLPremiumSub Invascom Astromart Issues Complaint
  • Docker Swarm vs Kubernetes Comparison Guide
  • When is it time to leave your VPS/VDS Cloud Hosting Provider?
  • 2024 Buyer's Guide: How to Choose and Buy the Best VPS/VDS for Your Needs - Tips and Strategies
  • Postfix / sendmail config for DKIM, SPF and DMARC Tutorial Guide E-mail Delivery for Hotmail.com Gmail.com and More HowTo
  • Install Grafana on Linux Debian Ubuntu Tutorial Guide
  • How To Completely Disable ufw in Linux Ubuntu Mint Debian
  • System has not been booted with systemd as init system (PID 1). Can't operate. Failed to talk to init daemon. Ubuntu Debian Linux Solution Cannot reboot
  • Mint Ubuntu Linux Gnome Showing Home Directory on Desktop instead of Desktop Directory
  • vi vim not doing code highlighting E319: Sorry, the command is not available in this version solution
  • Proxmox How To Rename Node Hostname Fix Solution
  • Linux how to get list of all timezones on system Ubuntu
  • Proxmox install issue cannot see the buttons or install wrong / bad resolution cannot see the entire screen problem solution
  • configure.ac:75: error: possibly undefined macro: AC_PROG_LIBTOOL If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation. solution
  • Can't exec "aclocal": No such file or directory at /usr/share/autoconf/Autom4te/FileUtils.pm line 326. autoreconf: failed to run aclocal: No such file or directory solution
  • /bin/sh: autoreconf: command not found solution
  • glib-2.0 required to compile QEMU solution
  • How To Upgrade Debian 8,9,10 to Debian 12 Bookworm
  • Linux dhcp dhclient Mint Redhat Ubuntu Debian How To Use Local Domain DNS Server Instead of ISPs