Template: mdadm/warning Type: note _Description: Initialise the superblock if you reuse hard disks WARNING! If you are using hard disks which have RAID superblocks from earlier installations in different RAID arrays, you MUST zero each superblock *before* activating the autostart feature. . To do this, do not start the RAID devices automatically. First, zero the superblock (mdadm --zero-superblock /dev/mdX). Next, use `dpkg-reconfigure mdadm` to reactivate the autostart feature. . If you manage your RAIDs otherwise (e.g. EVMS), either disable autostart, or ensure that /etc/mdadm/mdadm.conf only lists those arrays you want to start by mdadm. Template: mdadm/initrdstart Type: string Default: all _Description: RAID arrays needed for the root filesystem: If your system has its root filesystem on a RAID volume, it needs to be started early during the boot sequence. If your root filesystem is on a logical volume (LVM), which is on RAID, all constituent arrays need to be started. . If you know exactly which arrays are needed to bring up the root filesystem, enter them here. Alternatively, enter 'all' to simply start all available arrays. If you do not need or want to start any arrays for the root filesystem, leave the answer blank (or enter 'none'). . You have the option to start all other arrays (those not needed for the root filesystem) later in the boot sequence. Doing so will give you greater control over the arrays with the mdadm configuration file. Starting all arrays at boot-time may be safer though. . Please enter a space-separated list of devices, or 'all'. You may omit the leading '/dev/' and just enter e.g. "md0 md1". Template: mdadm/autostart Type: boolean Default: true _Description: Do you want to start RAID devices automatically? Once the base system has come up, mdadm can start all RAID devices specified in /etc/mdadm/mdadm.conf, which have not yet been started. Unless you have compiled RAID support into the kernel (in which case all RAID arrays with partitions of type 0xfd (and only those) are started automatically anyway), this is probably what you want. Template: mdadm/autocheck Type: boolean Default: true _Description: Should mdadm run monthly redundancy checks of the RAID arrays? If your kernel supports it (>> 2.6.14), mdadm can periodically check the redundancy of your RAID devices. This may be a resource-intensive process, depending on your setup, but it could help prevent rare cases of data loss. Note that this is a read-only check unless errors are found; if errors are found, mdadm will try to correct them, which may result in write access to the media. . The default, if turned on, is to run the checks on the first Sunday of every month at 01:06 o'clock. Template: mdadm/start_daemon Type: boolean Default: true _Description: Do you want to start the RAID monitoring daemon? The RAID monitor daemon sends email notifications in response to important RAID events (such as a disk failure). You probably want to enable it. Template: mdadm/mail_to Type: string Default: root _Description: Recipient for email notifications: Please enter the email address of the user who should get the email notification for these important RAID events.