Reconstructing RAID

Data recovery from RAID arrays with the help of Data Extractor RAID Edition

Moderator: Dmitriy_TS


lcoughey
New user
Posts: 168
Joined: 12.01.12
Reputation: 5 / (54)

Re: Reconstructing RAID

Postby lcoughey » 30.01.18, 20:05

AJ2008 wrote:Source of the post There is the possibility to safely extract data without cloning, the RAID edition of DE can be used with data copy option enabled - it is possibly the safest way to work on this case without cloning, however I agree with the comments above, since the client is trusting you with this job then it is ultimately your responsibility to ensure it is dealt with in the safest and most professional manner which would be to clone each disk and work off the clones.

If the drive is being accessed through DE with data copy enabled, it is being cloned, but only as you need it. I agree that it is probably the safest way to handle it, without reading the entire drive(s). However, in cases where the file system is EXT or a damaged FAT, it is likely to cause a lot of stress on the drives to bounce around trying to read sectors all over the place, rather than image larger chains in a linear fashion.

That said, I think it we agree to never assume that a drive is healthy and to never read a sector from the source twice.


AJ2008
Posts: 1310
Joined: 25.11.08
Reputation: 10 / (99)

Re: Reconstructing RAID

Postby AJ2008 » 30.01.18, 20:27

lcoughey wrote:Source of the post That said, I think it we agree to never assume that a drive is healthy and to never read a sector from the source twice.


Agreed :thumbup:


osity
User
Posts: 298
Joined: 06.12.15
Reputation: 4 / (38)

Re: Reconstructing RAID

Postby osity » 31.01.18, 03:03

how does everyone feel about " reconstruct RAID set leaving out the 2 failed drives"?
assuming this would be done after all the cloning.

it seems that I should also try to clone one of the two bad ones and include that in the reconstruction.


osity
User
Posts: 298
Joined: 06.12.15
Reputation: 4 / (38)

Re: Reconstructing RAID

Postby osity » 31.01.18, 09:07

how does everyone feel about the "reconstruct RAID set leaving out the 2 failed drives"?
assuming this would be done after cloning all drives.

I would assume that that I should also try to use one of the cloned bad ones in the reconstruction.


osity
User
Posts: 298
Joined: 06.12.15
Reputation: 4 / (38)

Re: Reconstructing RAID

Postby osity » 31.01.18, 09:07

osity wrote:Source of the post how does everyone feel about the "reconstruct RAID set leaving out the 2 failed drives"?
assuming this would be done after cloning all drives.

I would assume that I should also try to use one of the cloned bad ones in the reconstruction.


AJ2008
Posts: 1310
Joined: 25.11.08
Reputation: 10 / (99)

Re: Reconstructing RAID

Postby AJ2008 » 31.01.18, 13:03

This is fine, but you should also clone both bad drives as you are not sure which is the most recent to have failed and as a result do not know which one should be included.

User avatar
digitalsupport
New user
Posts: 77
Joined: 30.12.11
Reputation: 3 / (30)

Re: Reconstructing RAID

Postby digitalsupport » 31.01.18, 16:57

Agree to all comments, that why i said "6 perfectly working drives". If any issues at all, specific "weak" models, age or other known source to trouble then clone all.
Actually cloning 8 x ST3000VX now and would never approach a case like this without. Did not mean to encourage any "corner cutting"


Dmitriy_TS
Site Admin
Posts: 275
Joined: 01.04.13
Reputation: 7 / (73)

Re: Reconstructing RAID

Postby Dmitriy_TS » 20.03.18, 17:37

lcoughey wrote:Source of the post If the drive is being accessed through DE with data copy enabled, it is being cloned, but only as you need it. I agree that it is probably the safest way to handle it, without reading the entire drive(s). However, in cases where the file system is EXT or a damaged FAT, it is likely to cause a lot of stress on the drives to bounce around trying to read sectors all over the place, rather than image larger chains in a linear fashion.

That said, I think it we agree to never assume that a drive is healthy and to never read a sector from the source twice.


These rules should be carved in stone :umnik:
With best regards
ACELab technical support
ts.acelaboratory.com
blog.acelaboratory.com


Return to “Data Extractor RAID Edition”

Who is online

Users browsing this forum: No registered users and 1 guest