NEC Express5800/320Fc Manual download pdf (Page 63)

Administering RAID Arrays

Setting Up the ftServer System 5-15

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

‘‘Resynchronization’’

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 System”

•

‘‘Errors and Faulty Mirrors”

•

‘‘Removing a Faulty Mirror”

•

‘‘Resynchronization”

•

‘‘Replacing a Failed Disk”

•

‘‘Manually Creating Partitions on Blank Disks and Adding to RAID-1 Arrays”

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.

NOTE

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.

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NEC Express5800/320Fc Manual Page 63