восстановление soft raid5

Запустить неполный массив
mdadm --assemble --force /dev/md0 /dev/sdb /dev/sdd

Пересоздать
mdadm --create --verbose /dev/md0 --assume-clean --level=raid5
--raid-devices=3 --spare-devices=0 /dev/sda /dev/sdb /dev/sdc

Ребилд диска
mdadm /dev/md0 --fail /dev/sda && mdadm /dev/md0 --remove /dev/sda && mdadm
/dev/md0 --add /dev/sda

Поменять uuid
mdadm --assemble /dev/md0 -u новый_uuid -U uuid /dev/sda /dev/sdb /dev/sdc

-E информация из суперблока
--zero-superblock зачистить суперблок

mdadm automatically create a degraded RAID5 array

When creating a RAID5 array, mdadm will automatically create a degraded array with an extra spare drive. This is because building the spare into a degraded array is in general faster than resyncing the parity on a non-degraded, but not clean, array. This feature can be overridden with the --force option.

User tags

tar alien centos 7 sysresccd Salt .htaccess flash X forwarding kernel cpu dovecot iostat dns wget iowait freedos slab hdparm regex arping dpkg sftp ipmitool ipmi nfs4 Adaptec shorewall MODx quagga sublime SSD graylog2 chromium HTTPS hotplug SuperMicro SYN conntrack bridge numa ansible dhclient tool vlan iops glusterfs route CentOS radeon boot MegaRAID source sysctl cluster qcow2 sysrq KVM noop pacemaker corosync Swift ardour xhost vtysh usb perlbrew LVM performance arch 3Ware cgroups OpenSSL fio ubuntu vrrpd raid lstat initrd Areca vrrp php oprofile debootstrap gtk iptables lubuntu exim cpu usage openvpn apt ha pvmove nginx groups deb puppet CPAN cpanm munin tin firefox virsh bscan routing rkhunter tftp top tzdata parallel build gre docker-compose encrypt cache lts etch limit_conn DRBD tiger bonding SpamAssassin AMD rtsp alsa PTR ddos ps perl ssh equalizer jackd apache dstat nvidia exim4 sg cfq lenny java dhcp asoundrc bash keyboard NFS LSI swap pam language /etc/network/interfaces mdadm backup StorMan gdb newgrp raid5 vim bug xargs ulimit security erase rtl8723be core dump taskset tun search mariadb PXE shellshock squeeze scsi rpm fail2ban leap second mysql docker lxc git sysctl.conf backtrace idmapd glxinfo find mount drupal arp qemu proxy netfilter su virtualbox profiling xfs OpenStack HDFS opreport opcontrol APU video virt-install grub chroot zRam xen soa storage htop bind youtube gpg pulseaudio debian ip RT replication in-addr.arpa rsync wordpress mkfs sysfs elliptics bacula fido7 iSCSI