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Orbi WiFi 7 RBE973
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4.1.9(T6) Data Corruption

ianch99
Aspirant

Re: 4.1.9(T6) Data Corruption

Just to confirm, back on 4.1.8 and the Win 7 download corruption is no longer seen ..
Message 26 of 41
matthew1471
Guide

Re: 4.1.9(T6) Data Corruption

ianch99 wrote:
.. I then switched to a Win 7 PC and repeated the same process ... the cksum is different!! 🙂 Seems to be a Win 7 only problem? Possibly related to a Samba upgrade in T6?
I think I will go back 4.1.8 and wait for 4.1.9 ..

Wow, thanks for posting your findings. That's very interesting, I wonder if it's some Samba SMB2 bug.

I found some interesting (but not completely appropriate) pages such as http://support.microsoft.com/kb/2618096 and http://support.microsoft.com/kb/2028965 (what's the difference between the 2?) that seems to indicate Windows 7 itself is not perfect with SMB2 and multiple access but more importantly...

...SMB2 support was added in Samba 3.5 and listed as experimental (http://wiki.samba.org/index.php/Samba_3 ... ol_changes🙂 :

Samba 3.5 also includes experimental support for SMB2.[16] Samba 3.6 fully supports SMB2, except the modification of user quotas using the Windows quota management tools.[17]

Source: http://en.wikipedia.org/wiki/Server_Message_Block#SMB2

Apparently 3.6 is where SMB2 becomes stable. T6 was running 3.5.12 and T2 was running Samba 3.0.

I like that we are running new Samba (for security reasons and also that SMB2 is set to give one hell of a performance increase), so see the solution as Netgear either trying 3.6 Samba or making SMB2 an optional feature in Frontview listing "(reading file information while writing to it may in some instances cause file corruption)".

I might try again, but this time disabling SMB2 on my Windows 7 SP1 x64 computer but am sure it will work.
Message 27 of 41
slayerking
Aspirant

Re: 4.1.9(T6) Data Corruption

ianch99 wrote:

.. I then switched to a Win 7 PC and repeated the same process ... the cksum is different!! 🙂 Seems to be a Win 7 only problem? Possibly related to a Samba upgrade in T6?

I think I will go back 4.1.8 and wait for 4.1.9 ..
Nice find
Message 28 of 41
Skywalker
NETGEAR Expert

Re: 4.1.9(T6) Data Corruption

matthew1471, thanks for the great work nailing down how to reproduce this, and the super-handy utility! And sorry everybody for the trouble.

Interestingly, I have never been able to reproduce this issue by downloading straight from Firefox onto a NAS share -- even downloading several large files and making Windows Explorer refresh like a mad-man. But I am able to reproduce it easily with that utility, so there is most definitely a problem here.

So at this point, we don't know exactly what caused the issue, but changing a couple settings for 4.1.9-T9 (which I just posted), I can no longer reproduce the issue. We will continue to dig until we completely track it down, but if you guys could try 4.1.9-T9 and either confirm or deny that it resolves the data corruption issue for you, that would be very helpful.
Message 29 of 41
slayerking
Aspirant

Re: 4.1.9(T6) Data Corruption

Skywalker wrote:
matthew1471, thanks for the great work nailing down how to reproduce this, and the super-handy utility! And sorry everybody for the trouble.

Interestingly, I have never been able to reproduce this issue by downloading straight from Firefox onto a NAS share -- even downloading several large files and making Windows Explorer refresh like a mad-man. But I am able to reproduce it easily with that utility, so there is most definitely a problem here.

So at this point, we don't know exactly what caused the issue, but changing a couple settings for 4.1.9-T9 (which I just posted), I can no longer reproduce the issue. We will continue to dig until we completely track it down, but if you guys could try 4.1.9-T9 and either confirm or deny that it resolves the data corruption issue for you, that would be very helpful.

still doing it for me with T9
EDIT: Tried it with several different files and all have landed corrupt. The error this time is the file is not complete as before and the message is that the software is not for the version of windows you have blah blah

Gone back to T2 and it's fine again same files down as before and they are perfect. Yes winblows 7 here, I'll try on my fedora box a bit later
Message 30 of 41
bigfin
Aspirant

Re: 4.1.9(T6) Data Corruption

Same here with 4.1.9-T6 on a Duo, installed yesterday (just before it was pulled, I suppose) and saw two instances of data corruption from my Win7 PC:

1. Using the Win7 image viewer to view and in some cases rotate pictures. Done that on a folder of about 50 pictures, about one in 10 becomes unreadable.

2. Using QuickShadow Backup (mirroring utility):
23/04/2012 15:44:21: |-> Copy of C:\Users\Thierry\AppData\Roaming\Apple Computer\MobileSync\Backup\d6080810cf24934a841ecf7ecfcbce7e845e8203\3a38f8ca430ae354fea5a466fe823fa5f830179b failed - destination is not writable (off-line or full?), deferring
23/04/2012 16:06:42: |-> Verify FAILED
23/04/2012 17:33:26: |->Rename FAILED of \\nassau\Shadow-Turquois\C\Users\Thierry\AppData\Roaming\Microsoft\Excel\971%20Extension%202010-2%20v6301743740279537248\971%20Extension%202010-2%20v6((Autosaved-301743903559950560)).xls to \\nassau\Shadow-Turquois\C\Users\Thierry\AppData\Roaming\Microsoft\Excel\971%20Extension%202010-2%20v6301743740279537248\971%20Extension%202010-2%20v6((Unsaved-301743903559950560)).xls
-> Dest file not there. Expect a copy to follow.

Going back to T2 then, which is so slow as to make the NAS almost unusable, but at least does not corrupt data...

Cheers,

Bigfin
Message 31 of 41
matthew1471
Guide

Re: 4.1.9(T6) Data Corruption

Just noticed something interesting, T9 is now out..
Message 32 of 41
Skywalker
NETGEAR Expert

Re: 4.1.9(T6) Data Corruption

Okay, I believe we have a handle on this now. Stay tuned for T10 within the next few hours.
Message 33 of 41
matthew1471
Guide

Re: 4.1.9(T6) Data Corruption

Just applied T9.. what does T10 fix?

P.s. Initial testing seems to indicate that the corruption issue is fixed in T9 and WOW T9 is FAST!
Message 34 of 41
Skywalker
NETGEAR Expert

Re: 4.1.9(T6) Data Corruption

T9 could still hit this issue, but the chance is greatly reduced. It appears to be an issue with the file pointer getting moved (possibly by a read or write of another part of the file mid-transfer), and not properly reset. So the data could get written to the wrong place in the file under some circumstances. I've just posted T10 which should eliminate that possibility.
Message 35 of 41
slayerking
Aspirant

Re: 4.1.9(T6) Data Corruption

matthew1471 wrote:
Just applied T9.. what does T10 fix?

P.s. Initial testing seems to indicate that the corruption issue is fixed in T9 and WOW T9 is FAST!
Not for me 100% corruption again, Trying T10 in a couple of minutes.
Message 36 of 41
slayerking
Aspirant

Re: 4.1.9(T6) Data Corruption

Well after trying a few files it seems T10 has fixed the issue, good work.
Message 37 of 41
Skywalker
NETGEAR Expert

Re: 4.1.9(T6) Data Corruption

slayerking wrote:
Well after trying a few files it seems T10 has fixed the issue, good work.

That's great news. Thanks for bringing this up and including all the useful information to help reproduce it. And really, sorry to anyone affected by this.
Message 38 of 41
bigfin
Aspirant

Re: 4.1.9(T6) Data Corruption

Yes, much faster, and no data corruption so far... Many thanks for the quick turnaround on data corruption, and fixing the throughput issue was long overdue, but such a relief! My NAS and I are friends again - thank you once more.
Message 39 of 41
Sonicade
Aspirant

Re: 4.1.9(T6) Data Corruption

Thanks for creating this fix! My ReadyNas NV+ was having data corruption issues on T6 and T10 now fixes the issue!
Message 40 of 41
matt_hargett
Tutor

Re: 4.1.9(T6) Data Corruption

Thank you guys so much for continuing to support this product and resolving these issues! Going to install latest beta now 🙂
Message 41 of 41
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