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Forum Discussion
pdf files issues in Ready NAS
Current firmware 6.10.0 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 C...
Hi JDi
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.
Thanks
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
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