Disk Insertion; Administering Raid Arrays; To Stop A Raid Array And Move It To Another System - NEC Express5800/ftServer Administrator's Manual

Disk Insertion

When you reinsert a pulled disk, the OSM storage plugin attempts to match it with an
existing disk. If it finds a match, it hot-adds the mirror partitions on the inserted disk
back into the existing RAID arrays and resynchronizes them (see
on page 5-18).
Similarly, if you replace a failed disk, the OSM plugin automatically adds the
replacement disk to a running RAID array.

Administering RAID Arrays

This section discusses the following topics:
''To Stop a RAID Array and Move It to Another
''Errors and Faulty
''Removing a Faulty
''Resynchronization"
''Replacing a Failed
''Manually Creating Partitions on Blank Disks and Adding to RAID-1
You can use the mdadm command to administer RAID arrays. The following sections
provide examples of how to perform some common administrative procedures using
mdadm.
N O T E
Never remove both member disks of a RAID-1 array. The
Linux operating system does not support that operation.

To Stop a RAID Array and Move It to Another System

You can stop RAID-0 and RAID-1 arrays, if they are not in use. Unmount the file system
(if one is mounted) and stop the array as shown in the following example:
# umount /dev/md30
# mdadm -S /dev/md30
Before physically removing the disks from the system, check that the RAID array no
longer appears in /proc/mdstat. Edit the /etc/fstab and /etc/mdadm.conf
files on the current system to delete it. Edit the information into the files in the new
system. If the new system already has the device in use, you cannot start the RAID
array.
Mirrors"
Mirror"
Disk"
Administering RAID Arrays
''Resynchronization''
System"
Arrays"
Setting Up the ftServer System 5-15