mdadm: Cannot open /dev/sda1: Device or resource busy

This was caused by some weird dmraid setup which kind of takes control of drives even if they're blank/unused.

1. Check the table.

dmsetup table
ddf1_44656c6c202020201000006010281f0b3f5195b77cf86172: 0 3905945600 linear 8:0 0
ddf1_44656c6c202020201000006010281f0b3f5195b77cf86172p3: 0 37124096 linear 253:0 284547072
ddf1_44656c6c202020201000006010281f0b3f5195b77cf86172p2: 0 283496448 linear 253:0 1050624
ddf1_44656c6c202020201000006010281f0b3f5195b77cf86172p1: 0 1048576 linear 253:0 2048

2.) Delete the entry

dmsetup remove ddf1_44656c6c202020201000006010281f0b3f5195b77cf86172
device-mapper: remove ioctl on ddf1_44656c6c202020201000006010281f0b3f5195b77cf86172 failed: Device or resource busy
Command failed

*Delete the partitions first (eg. ending with p3 p2 p1 and then delete the main one)

 

After that mdadm will be happy.


Tags:

mdadm, dev, sda, resource, busythis, dmraid, unused, dmsetup, ddf, _, cf, linear, delete, entry, mapper, ioctl, partitions, eg,

Latest Articles

  • QEMU / KVM How To Manually Create Basic Virtual Machine VM
  • Linux wlan0 check all wireless clients
  • PHP Issues With Decoding Strange Smart Quotes And Non-Standard ASCII Characters
  • /etc/iproute2/rt_tables default settings file in Linux Centos 6,7 and most other NIX's
  • bind named error solutions named[2169]: error (no valid DS) resolving / error (broken trust chain) resolving / : error (no valid RRSIG) resolving 'com/DS/IN':
  • iptables how to log ALL dropped incoming packets
  • How To Edit Linux Based NM Network Manager Connection Settings Without GUI
  • Linux Disable IPV6 Centos / Debian / Mint Howto
  • Linux use growisofs to burn a larger file on a BD-R / Bluray Disc
  • Linux partprobe/partx cannot access last and 4th partition
  • DRBD Errors Caused By Physical Corruption
  • mdadm: add new device failed for /dev/sdb4 as 3: Invalid argument solution
  • Linux named / bind how to dump, view and clear the cache!
  • Centos 6 / 7 / 8 How To Change Default nameservers in /etc/resolv.conf when using DHCP / dhclient
  • Adobe Acrobat Reader for Linux to use and view XFA Fillable Forms
  • Debian Linux Mint Ubuntu iptables save and restore settings automatically onboot and reboot
  • Why SMART is not smart at all and doesn't properly predict disk errors that cause a kernel panic or crash
  • scp: ambiguous target error and solution
  • VirtualBox How To Add iSCSI Storage using VBoxManage
  • iSCSI on Centos 7 Configuration and Setup Guide for Initiator and Target