When To Recover; Assembling Md Devices For Recovery (Linux); Bootability Troubleshooting - ACRONIS BACKUP AND RECOVERY 10 SERVER FOR LINUX - UPDATE 3 User Manual

6.3.8

When to recover

Select when to start the recovery task:

Recover now - the recovery task will be started immediately after you click the final OK.

Recover later - the recovery task will be started at the date and time you specify.
If you do not need to schedule the task and wish to start it manually afterwards, select the Task will
be started manually (do no schedule the task) check box.
6.3.9

Assembling MD devices for recovery (Linux)

In Linux, when performing recovery from a disk backup to an existing MD device (also called Linux
Software RAID), make sure that this device is assembled at the time of recovery.
If the device is not assembled, assemble it by using the mdadm utility. Here are two examples:
Example 1. The following command assembles the device /dev/md0 combined of the volumes
/dev/sdb1 and /dev/sdc1:
mdadm --assemble /dev/md0 -ayes /dev/sdb1 /sdc1
Example 2. The following command assembles the device /dev/md0 combined of the disks /dev/sdb
and /dev/sdc:
mdadm --assemble /dev/md0 -ayes /dev/sdb /dev/sdc
If the recovery requires the machine to be rebooted (usually, when the volumes to recover include
the boot partition), follow these guidelines:
 If all parts of the MD device are volumes (a typical case, such as in the first example), make sure
that the type of each volume—called partition type or system ID—is Linux raid automount; the
hexadecimal code of this partition type is 0xFD. This will guarantee that the device will be
automatically assembled following the reboot. To view or change the partition type, use a disk
partitioning utility such as fdisk.
 Otherwise (such as in the second example), perform the recovery from bootable media. No
reboot will be required in that case. In bootable media, you may need to create the MD device
manually or automatically, as described in Recovering MD devices and logical volumes (p. 162).

6.3.10 Bootability troubleshooting

If a system was bootable at the time of backup, you expect that it will boot after recovery. However,
the information the operating system stores and uses for booting up may become outdated during
recovery, especially if you change volume sizes, locations or destination drives. Acronis Backup &
Recovery 10 automatically updates Windows loaders after recovery. Other loaders might also be
fixed, but there are cases when you have to re-activate the loaders. Specifically when you recover
Linux volumes, it is sometimes necessary to apply fixes or make booting changes so that Linux can
boot and load correctly.
Below is a summary of typical situations that require additional user actions.
Why a recovered operating system may be unbootable

The machine BIOS is configured to boot from another HDD.
Solution: Configure the BIOS to boot from the HDD where the operating system resides.
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