# mdadm configuration file## mdadm will function properly without the use of a configuration file,# but this file is useful for keeping track of arrays and member disks.# In general, a mdadm.conf file is created, and updated, after arrays# are created. This is the opposite behavior of /etc/raidtab which is# created prior to array construction.### the config file takes two types of lines:## DEVICE lines specify a list of devices of where to look for# potential member disks## ARRAY lines specify information about how to identify arrays so# so that they can be activated## You can have more than one device line and use wild cards. The first # example includes SCSI the first partition of SCSI disks /dev/sdb,# /dev/sdc, /dev/sdd, /dev/sdj, /dev/sdk, and /dev/sdl. The second # line looks for array slices on IDE disks.##DEVICE /dev/sd[bcdjkl]1#DEVICE /dev/hda1 /dev/hdb1## If you mount devfs on /dev, then a suitable way to list all devices is:#DEVICE /dev/discs/*/*#### ARRAY lines specify an array to assemble and a method of identification.# Arrays can currently be identified by using a UUID, superblock minor number,# or a listing of devices.## super-minor is usually the minor number of the metadevice# UUID is the Universally Unique Identifier for the array# Each can be obtained using## mdadm -D <md>##ARRAY /dev/md0 UUID=3aaa0122:29827cfa:5331ad66:ca767371#ARRAY /dev/md1 super-minor=1#ARRAY /dev/md2 devices=/dev/hda1,/dev/hdb1## ARRAY lines can also specify a "spare-group" for each array. mdadm --monitor# will then move a spare between arrays in a spare-group if one array has a failed# drive but no spare#ARRAY /dev/md4 uuid=b23f3c6d:aec43a9f:fd65db85:369432df spare-group=group1#ARRAY /dev/md5 uuid=19464854:03f71b1b:e0df2edd:246cc977 spare-group=group1## When used in --follow (aka --monitor) mode, mdadm needs a# mail address and/or a program. This can be given with "mailaddr"# and "program" lines to that monitoring can be started using# mdadm --follow --scan & echo $! > /var/run/mdadm# If the lines are not found, mdadm will exit quietly#MAILADDR root@mydomain.tld#PROGRAM /usr/sbin/handle-mdadm-events