Managing RAID on Linux

Name

Assemble mode

Synopsis

mdadm --assemble mddevice [options] memberdevices

Assemble mode activates an array that has already been created using --create or --build. It might be helpful to think of Assemble mode as being similar to the raidstart command.

Options

-A, --assemble

Assembles (starts) an existing array.

-u, --uuid=

Specifies the UUID of an array to assemble. Disks are scanned for a RAID superblock containing the UUID and combined into an array.

-m, --super-minor=

Uses the minor number to identify which member disks belong to an array. All software arrays have a major number of 9. By default, each array has a minor number that corresponds to the number of its device special name. Thus, /dev/md1 has a minor number of 1, and /dev/md22 has a minor number of 22.

-s, --scan

Scans the configuration file /etc/mdadm.conf for information that could be used to assemble the array listed on the command line. This is useful for assembling arrays without having to remember their UUIDs, minor numbers, or component devices. See the /etc/mdadm.conf section, later in this chapter, for more information.

-c, --config=

Specifies an alternate location for /etc/mdadm.conf. See the /etc/mdadm.conf section, later in this chapter, for more information.

-R, --run

Starts an array when possible, even if some of its member disks are missing or unavailable. This is useful for starting a RAID-1, RAID-4, or RAID-5 in degraded mode.

-f, --force

Starts an array even if the RAID superblocks found on member disks are inconsistent. ...