- Joined
- Feb 15, 2014
- Messages
- 20,194
Thanks for heads up! You are right, all disks are AF. Regarding the ECC, do you really think it is the cause of the problem? I need some more information on why ECC is so important for ZFS? I am running lots of other servers, which do have more ram and do not have ECC and have no problem for years. I agree that it helps in rare cases. This errors should be sporadic errors, right? I can not imagine a ECC problem here as it is reproducible and memory has been intensively checked.
Then, regarding the amount of RAM. Shouldn't 8GB be enough for <3TB of data? I have only 2x3TB mirror. I thought, roughly, that 1GB for 1TB would be enough and 8GB are stated as the minimum. What I do not understand is, that the amount of RAM is always given as explanation for unpredictable behaviour. For an enterprise system there should always be a well defined and predictable behaviour. There should be no doubt at all as NAS systems always grow. So memory should be the cause for performance degredation but not for critical errors and data loss. If this would be the case, no company would by such a system ever! So I guess it is more like "it could be" "who knows" (because we do not know the real answer).... If it really would be the case that ZFS is so sensitive to RAM size that it would cause data corruption then I would turn away from it. But this is in contrary to my experience. Because of experience I changed to ZFS a longer time agou and also use it heavily in linux with ZoL. I even use it for my disks which I swap between workstations and laptop. Works for years now like a charm. And I configured RAM limitation on all computers. I came to it because I spent a lot of time on finding the cause of bluescreens etc. on a hybrid disk with broken firmware. ZFS was the only file system which directly again and again showed up errors immediately. Since then this is my fs nr. 1.
You'll find that Cyberjock's guide will answer your basic ECC questions.
There's also the ECC sticky which goes a bit more in-depth.
http://forums.freenas.org/index.php...ning-vdev-zpool-zil-and-l2arc-for-noobs.7775/