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NAS Recovery Course - NAS Recovery Preparations Test
Check based on what you can estimate the state of physical disks in a NAS
sounds coming from the disks
the words of a client
the S.M.A.R.T. attributes
Check those S.M.A.R.T. attributes pointing to the bad condition of a disk
G-sense error rate
reallocated sectors count
offline uncorrectable sector count
start/stop count
current pending sector count
Check what information you can get if you know a NAS vendor and exact NAS model
hard drive sector size
maximum number of disks
supported RAID levels
possible filesystem types
disk order for RAID5 and RAID6
Check what you should ask a client about a NAS configuration
whether a client used disks of the same model in a NAS
whether a client changed an array type
whether a client ever replaced disks
whether a client ever added disks
Choose the advantage of disk images compared to disk clones
reliability
speed
convenience in storage and archival
When recovering a NAS, it is always better to create disk image files rather than disk clones
true
false
What helps you determine a sector size for disks partitioned with GPT?
main MBR
GPT database
EXT i-node
EFI PART signature
What do you need to try if the sum of sizes of partitions does not correspond to the size of a physical disk and you suspect the sector size is uncorrect?
multiply the total size of partitions by 8
multiply the total size of partitions by 4
divide the total size of partitions by 8
Why they do not recommend storing several disk image files on the same disk when recovering data?
recovery will be too slow
the disk may degrade due to the frequent read requests
Choose the advantage of disk clones compared to disk images
speed
reliability
convenience in storage and archival
Next lesson - Partitions in NASes
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