xman111 Posted September 15, 2018 Share Posted September 15, 2018 hey guys, just bought 2 4tb WD Reds to upgrade my 2tb parity drives. Just pre clearing them now. How do i know if it is safe to rebuild parity? Anything I should look for? Quote Link to comment
JonathanM Posted September 15, 2018 Share Posted September 15, 2018 9 minutes ago, xman111 said: How do i know if it is safe to rebuild parity? Clean smart reports on all data drives, and a zero error parity check run. Quote Link to comment
xman111 Posted September 15, 2018 Author Share Posted September 15, 2018 how does this diagnostic look? what are the important parts of the smart report? i know i have some CRC errors. also, after clearing for a couple days, i should rerun a parity before I swap out a parity disk? Thanks for your help, appreciate it. server-diagnostics-20180915-1315.zip Quote Link to comment
xman111 Posted September 16, 2018 Author Share Posted September 16, 2018 do i have to look at all disks? or mainly just the parity and the ones replacing the parities? Quote Link to comment
trurl Posted September 16, 2018 Share Posted September 16, 2018 10 minutes ago, xman111 said: do i have to look at all disks? or mainly just the parity and the ones replacing the parities? All disks should be reliable because ALL disks must be reliably read to reliably reconstruct a missing or disabled disk. Parity by itself is not enough to recover any data. Quote Link to comment
xman111 Posted September 16, 2018 Author Share Posted September 16, 2018 Trurl, thanks for that. I didn't realize that, i thought that the parity was everything. What stat is the best for monitoring disk condition? does my diagnostic file show anything? Someone said disk 1 doesn't look good so I am going to replace it as well. I guess i am just struggling with how do i know when to replace and is that disk ok to put in my backup server or do i just take a hammer to these disks? Quote Link to comment
trurl Posted September 16, 2018 Share Posted September 16, 2018 unRAID monitors the important SMART attributes and will show you on the Dashboard if any are a problem. Also, if you setup Notifications (and you must!) unRAID will alert you by email or other agent when your server has any issues, including disk problems. 1 hour ago, xman111 said: i thought that the parity was everything. How could parity alone allow you to recover any disk? It obviously doesn't have the capacity to contain the data for every disk in the array. Parity isn't very complicated and understanding parity can help make sense of how unRAID works. Here is a wiki: https://wiki.unraid.net/UnRAID_6/Overview#Parity-Protected_Array Dual parity is similar. It uses a different calculation but still needs the other disks. Quote Link to comment
JorgeB Posted September 16, 2018 Share Posted September 16, 2018 unRAID unRAID is now Unraid , though it will take some time to get used to the new way of writing, I still first use the old one then remember. BTW, sorry off topic but been meaning to ask trurl, no problems with Florence? IIRC you're in NC, or is it VA? Quote Link to comment
trurl Posted September 16, 2018 Share Posted September 16, 2018 3 hours ago, johnnie.black said: sorry off topic but been meaning to ask trurl, no problems with Florence? IIRC you're in NC I'm in Greensboro, same place as Joe L. I think, though I have never met him. We have been getting a lot of rain but that's about it this far inland. Friday morning we were actually out buying kayaks, though not for the flood.😁 We took a lot of tree damage from Fran many years ago so we were concerned. I have a lot of trees around my house. Quote Link to comment
JorgeB Posted September 16, 2018 Share Posted September 16, 2018 We have been getting a lot of rain but that's about it this far inland. Good to know, and good luck to anyone else affected by the storms. Quote Link to comment
xman111 Posted September 16, 2018 Author Share Posted September 16, 2018 yup, stay safe.. up here in Canada, on the West coast, we don't have storms like that. Quote Link to comment
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