ReclaiMe Data Recovery Training

NAS Recovery Course - Overall Test

When you do not need to recover RAID configuration when recovering a NAS?

you deal with RAID5 with one disk missing
you deal with XFS
you deal with RAID5 with all disks present
LVM and md metadata are good

What is the recommended approach when recovering an array configuration on NAS disks?

do RAID recovery on the physical disks
create regions on NAS disks and do RAID recovery on them

Check the most common types of NAS failure

NAS box failure
disk failure
filesystem failure

What is the first step in NAS recovery?

identify the filesystem on a NAS
ask a client about a NAS and NAS failure
clone the disks

In case of filesystem damage you need to recover an array configuration

true
false

In case of filesystem damage LVM and md-raid metadata are usually correct

true
false

Does it make sense to launch two data recovery tools in turn over the same set of NAS disks?

yes, to be sure that nothing is overlooked due to difference in data recovery algorithms
no, it is just a waste of time, all major data recovery tools work the same way

If md metadata is damaged then

you need to recover RAID configuration only if LVM is damaged
you need to recover RAID configuration only if disks were upgraded
you need to recover RAID configuration only if LVM is good
you need to recover RAID configuration

In case of filesystem damage you need to

create regions on NAS disks, do RAID recovery, and then file recovery
do RAID recovery first and then file recovery
do file recovery

If LVM metadata is bad while md is good, then fully automatic recovery (bypassing RAID recovery stage) is possible

fully automatic recovery is impossible without LVM metadata
only with disks of the same size and only if the disks in a NAS were never upgraded
only with disks of the same size regardless disk upgrades

Return to the list of lessons

We have a mailing list in which we talk about interesting cases we encounter and share some tips and tricks.