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[robotico]

Pardon the length- trying to be thorough with my experience.

I've had my 323 up and running for about three months as a mirrored raid using two 1tb drives. A few of my IT buddies recommended I buy a third 1tb drive to swap out so I don't have the mirror using drives with similar mtbfs. After looking around, it appeared all I had to do was remove the slave/secondary drive and stick in the new drive. Did that, it formatted and began the synch. When the synch was complete, I did a quick run through some directories and all looked ok at first. Then I noticed files missing, corrupt files and totally empty directions. Then I saw files actually disappear from view with a directory window open with NAS mounted on my computer. Then it happened a few more times. At that point I removed the new secondary drive and returned the original secondary to it's slot. When I rebooted the NAS it prompted to format the original secondary drive and I declined. I pulled the original secondary and booted the NAS with just primary. When mounted, the NAS was exhibiting the same behavior as before. This is with just the original primary installed. Sometimes I could close a directory, reopen it and (some or all) the files would be there again. But later I'd open the directory and they'd be gone. Ultimately the directory would wind up empty. At that point I copied the entire contents of the primary drive over to another external 1tb drive. Files and directories copied over as they appeared at the moment of being copied from the NAS to the external drive - corrupt files remain corrupt.

The NAS was then rebuilt, formatting two 1tb drives as mirrored. I copied all the files/directories over from the external 1tb drive without any errors. I went through and all NAS directories mirrored the external drive. Yet here's the kicker- I am still seeing files disappear off the NAS. Some times the files reappear, but most times not as in the case just before posting this thread. I was deleting about twenty files from a directory and shortly after they were deleted, the entire contents (another forty or so files) of the folder disappeared- right before my eyes.

I've never gotten any read or write errors while moving files too or from the server. The web interface works fine. No errors reported there either. Nothing unusual to give any indication that there's a problem. The anomalies appear in several OSs- Mac, Linux and windows.

I feel fortunate that all my job files are now on the external drive. What I've lost are the high resolution versions of personal photos. But I've got so say that the loss of confidence in the hardware is probably more painful than losing those images. Losing work is serious stuff.

Any ideas? thanks, Rob

[fordem]

First - don't go swapping the drives around - that is not what RAID was intended for, and it will cause you problems..

Second - your experience - re the disappearance of the files is definitely not normal, I've had my DNS-323 for almost 23 months now and have never had files either disappear or become corrupt.

What firmware are you using and what file system?  The earlier firmware - I'm not certain where it was removed - supported ext3 and that was apparently noted for corruption and data loss.

I use my DNS-323 primarily as a D2D backup target, and whilst I've never had to do a restore, I do a verify after each backup which has never failed, and I can go to individual folders and retrieve the files if I so choose and I've done that from time to time with no difficulty.

[Darryl_Gittins]

I'm now having the problem of files disappearing from my DNS-321. All files in some folders disappear from the subfolders. The folder structure remains but the files in each folder are gone. Only some folders seem to be affected. I'm just running one drive in the DNS-321. Any ideas what might be causing this? It's really disturbing to see data being deleted like this.