Very simple set up, NAS and 2 computers with full access.
I've been using the same unit, same computers and same software, I created a pdf file from QuickBooks using CutePDF Writer irectly into a shared folder in my NAS, I was able to open the pdf with no problem, then emailed t to one of my contacts and they also were able to open it, a week later I look for the same file in my NAS and size is 0 KB, obviouly the file can't open becasue it doesn't contain any data...Checked log files inside NAS, no errors, no power issues, nothing weird.
Notes: I have created pdf files the same way in the past and didn't see any problem before.
Any comments will be appreciated
Model: RN21200|ReadyNAS 212 Series 2- Bay (Diskless)
The filesystem of the NAS will do checksumming of files. This means that when a file is written or changes (writing occurring) then the filesystem will do a checksum of that file post writing. Think of it like a hashed number of the file. The filesystem then stores this number in metadata. Next time the file is requested, the filesystem will run a hash of the file and compare against the hashed number in metadata. The two numbers should match as the file should not have changed. That is basically what checksumming does.
If the checksumming fails that means data corruption - i.e. changes to the file that a user did not request.
I doubt this is file corruption if it only happened once. More likely a client or program that did this.
Please keep an eye on it and if it happens again, let us know.
It can't be a user because it already happened 3 or 4 times with files that only 1 user have access (myself) ... again it just heppened....after creating a pdf file size 180 Kb, I emailed it as an attachment from NAS, and today (2 days later) the same file shows 0 Kb inside the NAS, however the person I sent it to, send me a copy and that copy is good, so it is definetely happening inside NAS
I did check detailed logs, but no errors found, I strongly believe it was an update on my NAS, I didn't have this problem before and nothing has changed, except the firmware on my NAS, can I remove the last (or last 2) firmware without losing data?? Any Netgear tech that can offer some info here?? All help is much appreciated.
Hey! it looks like nobody in the community cares about this issue or nobody know...let's compare my situation with yours...are you by any chance syncing the NAS with Dropbox or G drive??
I am using the NAS 212
Firmware 6.10.0
under cloud services I am backing up using Dropbox with Sync Direction: Upload local storage changes only
and also backing up with Gdrive with Bidirectional Sync
No Apps installed and no automatic backup has been set up
