ReclaiMe Data Recovery Training

NAS Recovery Course - Overall Test

What is the first step in NAS recovery?

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

In case of filesystem damage you need to

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

Check the most common types of NAS failure

NAS box failure
filesystem failure
disk failure

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

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

Check what determines the quality and complexity of NAS recovery in case of one or several member disk failures?

how much time has passed since the disk failure
the state of RAID metadata (md/LVM)
actions of a client after disk failure

Filesystem damage in most cases is associated with

disk failure
operator errors
NAS box failure

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

If both LVM and md metadata are good then

you need to recover RAID configuration anyway
you do not need to recover an array configuration
you need to recover RAID configuration only if disks were upgraded

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

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

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.