Hello everybody! I have good news, the problem is gone. For everyone who has this problem, I did the following I use rpm... Get list of installed packages # rpm -qa | grep "dracut" dracut-033-554.el7.x86_64 dracut-network-033-554.el7.x86_64 dracut-config-rescue-033-554.el7.x86_64 Delete packages # rpm -e --nodeps "dracut-config-rescue-033-554.el7.x86_64" # rpm -e --nodeps "dracut-network-033-554.el7.x86_64" # rpm -e --nodeps "dracut-033-554.el7.x86_64" I download old packages in local directory and install it # rpm -ivh dracut-033-535.el7_5.1.x86_64.rpm Preparation... ################################# [100%] Update / install... 1:dracut-033-535.el7_5.1 ################################# [100%] # rpm -ivh dracut-config-rescue-033-535.el7_5.1.x86_64.rpm Preparation... ################################# [100%] Update / install... 1:dracut-config-rescue-033-535.el7_################################# [100%] # rpm -ivh dracut-network-033-535.el7_5.1.x86_64.rpm Preparation... ################################# [100%] Update / install... 1:dracut-network-033-535.el7_5.1 ################################# [100%] check installed... # rpm -qa | grep "dracut" dracut-033-535.el7_5.1.x86_64 dracut-network-033-535.el7_5.1.x86_64 dracut-config-rescue-033-535.el7_5.1.x86_64 After that, the system successfully booted with one disk disabled. The array was assembled at one disk . After connecting and booting with two attached disks manually add disconnected partitions array. # mdadm /dev/md124 --add /dev/sda1 mdadm: hot added /dev/sda1 # mdadm /dev/md125 --add /dev/sda2 mdadm: hot added /dev/sda2 # mdadm /dev/md126 --add /dev/sda3 mdadm: re-added /dev/sda3 # mdadm /dev/md127 --add /dev/sda4 mdadm: re-added /dev/sda4 And waiting for the end of the recovery process for all arrays # cat /proc/mdstat Thanks for your quick help! Best Regards AndersonGH >Четверг, 4 апреля 2019, 17:24 +03:00 от Gordon Messmer <gordon.messmer at gmail.com>: > >On 4/4/19 6:17 AM, Konstantin Msk via CentOS wrote: >> a drive is unplugged... while the system is not running mdadm will not reassemble the array on boot. >> >> Red Hat Bugzilla – Bug 1451660 >> Write that Fixed In Version:dracut-033-546.el7 > >That's probably a mistake. The bug isn't closed. > > >> I have drucat version 033-554.el7 and this bag don't fixed! > > >One of the suggested work-arounds in that bug report is to revert to an >older version of dracut and rebuild your initrd. You'd need to get: > >dracut-033-535.el7.x86_64.rpm >dracut-config-rescue-033-535.el7.x86_64.rpm >dracut-network-033-535.el7.x86_64.rpm kexec-tools-2.0.15-13.el7.x86_64.rpm > >...from the vault: http://vault.centos.org/7.5.1804/updates/x86_64/Packages/ > >Downgrade those packages, and then run "dracut -f" to rebuild the initrd >for your kernel. > >_______________________________________________ >CentOS mailing list >CentOS at centos.org >https://lists.centos.org/mailman/listinfo/centos