Hello,I'm trying to recover data from a ReadyNAS (not sure the model I only have access to the drives currently). It was originally a configured as X-RAID2, then was mistakenly re-configured by the user. I've done quite a number of complex RAID recoveries so I'm not looking for the usual comments about taking it to a "pro". :lol: My question is, does X-RAID2 ever use a parity delay? Also what is the default stripe size...64Kb I assume? Also is the parity rotation left synchronous, right asynchronous, etc.?Any details that can be provided will greatly speed up the process here. Due to it being reconfigured, I'm having to scan several Gb each time I change a setting just to get an idea where I stand. :roll:

Usually when a factory reset is done one would give up on hopes of data recovery. We do provide strong warnings about factory resets. When a factory reset is done we wipe the partition table off the disks. I don't like your chances.

Lost partition tables aren't a problem for me, just make it all more complex and time consuming. It's not really a matter of my "chances", I'll get the data I always do. It's just a matter of how long it'll take (already have a pretty good idea where the partition was). I'm just hoping someone can answer one of my questions to help eliminate possibilities.As I said in my post, right now I only have access to the hard drives. Waiting to hear from the customer what the model was. It's three drives, and I've verified using XOR that it is a basically a RAID 5 config (technically X-RAID2, but with three drives it's about the same).

Jared wrote:My question is, does X-RAID2 ever use a parity delay?No.Jared wrote:Also what is the default stripe size...64Kb I assume?64KB is correct.Jared wrote:Also is the parity rotation left synchronous, right asynchronous, etc.?The parity layout is left-symmetric.

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mdgm-ntgr
NETGEAR Employee Retired
Jun 01, 2015
Usually when a factory reset is done one would give up on hopes of data recovery. We do provide strong warnings about factory resets. When a factory reset is done we wipe the partition table off the disks. I don't like your chances.
RX
Luminary
Jun 01, 2015
What is the NAS model that you have? You could check the model by logging-in to the web-GUI called Frontview.
Is your NAS detected by RAIDar?
What is the current FW version of it?
How many drives are currently in it?

About X-RAID2, check these link:
http://www.readynas.com/?p=656
http://www.netgear.com/images/pdf/WP_XR ... 2May14.pdf
Jared2
Aspirant
Jun 01, 2015
Lost partition tables aren't a problem for me, just make it all more complex and time consuming. It's not really a matter of my "chances", I'll get the data I always do. It's just a matter of how long it'll take (already have a pretty good idea where the partition was). I'm just hoping someone can answer one of my questions to help eliminate possibilities.

As I said in my post, right now I only have access to the hard drives. Waiting to hear from the customer what the model was. It's three drives, and I've verified using XOR that it is a basically a RAID 5 config (technically X-RAID2, but with three drives it's about the same).

Jared2

Aspirant

Jun 01, 2015

Ixa wrote:
What is the NAS model that you have? You could check the model by logging-in to the web-GUI called Frontview.
Is your NAS detected by RAIDar?
What is the current FW version of it?
How many drives are currently in it?

About X-RAID2, check these link:
http://www.readynas.com/?p=656
http://www.netgear.com/images/pdf/WP_XRAID2vsFlexRAID%20_12May14.pdf

Ixa wrote:
What is the NAS model that you have? You could check the model by logging-in to the web-GUI called Frontview. Is your NAS detected by RAIDar? What is the current FW version of it? How many drives are currently in it? About X-RAID2, check these link: http://www.readynas.com/?p=656 http://www.netgear.com/images/pdf/WP_XRAID2vsFlexRAID%20_12May14.pdf

Already read all of that long before I posted this. But unfortunately none of it mentions details about parity delay, parity rotation, or default stripe size. I'm just hoping someone here has a bit more technical expertise. If not, I'll post my findings when I do eventually figure it out.

Skywalker
NETGEAR Expert
Jun 01, 2015
Jared wrote:
My question is, does X-RAID2 ever use a parity delay?

No.
Jared wrote:
Also what is the default stripe size...64Kb I assume?

64KB is correct.
Jared wrote:
Also is the parity rotation left synchronous, right asynchronous, etc.?

The parity layout is left-symmetric.
Jared2
Aspirant
Jun 01, 2015
Thank you Skywalker, and may the force continue to be with you. You just helped me cut down the number of possible equations by a few million.

I'm thinking they may have changed the 64Kb stripe size from the default, or I would have figured it out already. But, much easier now.
Skywalker
NETGEAR Expert
Jun 02, 2015
Hmm, FWIW, there were some old models that defaulted to a 16KB stripe size.
Jared2
Aspirant
Jun 02, 2015
Ok, so I found out the model is a RNDX4250-100NAS. It originally had 2 -500Gb drives, then a 2Tb drive was added to the X-RAID2. However as I expected the latter 1.5Tb is unused since a second large drive was never added. I've tried every combination of 64Kb stripe and ruled that out. Perhaps it is 16Kb.
mdgm-ntgr
NETGEAR Employee Retired
Jun 02, 2015
The NVX has a 32-bit CPU, is the second oldest desktop x86 ReadyNAS and may have been last factory defaulted on very old firmware.

I think it's likely that it's one of the models with the 16KB stripe size.
Jared2
Aspirant
Jun 02, 2015
Wow, this thing is a real pain. I've eliminated every possible combination of RAID 5 using 8Kb, 16Kb, 32Kb, 64Kb, 128Kb with no success. There isn't a chance that this thing was using a fixed parity disk is there??? I've verified quite a number of sectors using XOR and it's definitely using parity. That, or the customer really isn't giving me the whole story here and something is way off.