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NAS Recovery Course - NAS Recovery Preparations Test
Choose the advantage of disk clones compared to disk images
speed
convenience in storage and archival
reliability
Why they do not recommend storing several disk image files on the same disk when recovering data?
the disk may degrade due to the frequent read requests
recovery will be too slow
Check what information you can get if you know a NAS vendor and exact NAS model
possible filesystem types
hard drive sector size
disk order for RAID5 and RAID6
supported RAID levels
maximum number of disks
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 4
divide the total size of partitions by 8
multiply the total size of partitions by 8
Choose the advantage of disk images compared to disk clones
convenience in storage and archival
speed
reliability
What helps you determine a sector size for disks partitioned with GPT?
GPT database
main MBR
EXT i-node
EFI PART signature
Check those S.M.A.R.T. attributes pointing to the bad condition of a disk
start/stop count
reallocated sectors count
offline uncorrectable sector count
G-sense error rate
current pending sector count
Check what you should ask a client about a NAS configuration
whether a client ever replaced disks
whether a client ever added disks
whether a client used disks of the same model in a NAS
whether a client changed an array type
The information about a NAS coming from a client is often unreliable
yes
no
yes, but it's better than nothing
You need to check sector sizes for each disk form a NAS when
array type has been changed
a client does not remember what sector sizes he/she set up when installing disks
disks of different models are used in a NAS
Next lesson - Partitions in NASes
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