ReclaiMe Data Recovery Training
NAS Recovery Course - Overall Test
If md metadata is damaged then
you need to recover RAID configuration
you need to recover RAID configuration only if LVM is damaged
you need to recover RAID configuration only if LVM is good
you need to recover RAID configuration only if disks were upgraded
In case of filesystem damage LVM and md-raid metadata are usually correct
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 the most common types of NAS failure
NAS box failure
Filesystem damage in most cases is associated with
NAS box failure
In case of filesystem damage you need to recover an array configuration
What is the recommended approach when recovering an array configuration on NAS disks?
create regions on NAS disks and do RAID recovery on them
do RAID recovery on the physical disks
When you do not need to recover RAID configuration when recovering a NAS?
you deal with RAID5 with all disks present
you deal with RAID5 with one disk missing
LVM and md metadata are good
you deal with XFS
Check what determines the quality and complexity of NAS recovery in case of one or several member disk failures?
actions of a client after disk failure
the state of RAID metadata (md/LVM)
how much time has passed since the disk failure
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 regardless disk upgrades
only with disks of the same size and only if the disks in a NAS were never upgraded
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