Kung-Fubick Posted January 16, 2021 Share Posted January 16, 2021 Hi I am relatively new to Unraid and am currently trying out the trial version to see if I should get a license to use as a NAS as a few docker containers. I have tried starting my array of 2 disks several times at this point but the parity check (or parity copying) always fails at 70.2%. I found a few other threads that suggested changing the SATA port on the MB and changing the cables but even after doing so it seems like the disk still fails. I will attach logs in this post for anyone that could see if they can find any information in them. But to my understanding the parity HDD is dead? I am going to try to run the Preclear disk Utility over night to see if it does anything different. I also have 2 simpler questions. Does Unraid usually take a long time to reboot and it seems like it has an effect on the amount of time my BIOS takes to boot, is this normal? (probably takes 5 minutes in comparison to my workstation which usually takes 2 sec.) Had some trouble with the automatic formatter when starting the array. Had to use Fdisk in the terminal to change the partition type and then it could format and mouint the drives, is this intended? Thankful for any help, Kung-Fubick nas-syslog-20210116-2254.zip Quote Link to comment
trurl Posted January 16, 2021 Share Posted January 16, 2021 4 minutes ago, Kung-Fubick said: parity copying Copying parity is not something that is done except during the Parity Swap procedure. I assume that is not what you are attempting to do. 5 minutes ago, Kung-Fubick said: Had some trouble with the automatic formatter when starting the array. Had to use Fdisk in the terminal to change the partition type and then it could format and mouint the drives, is this intended? Not sure what you mean by any of that. Should not be necessary to go to the command line for these routine management operations, and in fact, not recommended since you are likely to do something wrong. Also never heard of anyone having this problem. Where did these disks come from? 7 minutes ago, Kung-Fubick said: attach logs Instead of syslog, we always prefer complete diagnostics, which contains syslog and many other things. If possible before rebooting and preferably with the array started Go to Tools - Diagnostics and attach the complete Diagnostics ZIP file to your NEXT post in this thread. Quote Link to comment
trurl Posted January 16, 2021 Share Posted January 16, 2021 11 minutes ago, Kung-Fubick said: parity HDD is dead? Based on syslog my guess is connection problem. Diagnostics may tell more. Quote Link to comment
Kung-Fubick Posted January 16, 2021 Author Share Posted January 16, 2021 My lingo might not be up to speed on the subject but I will try my best to explain. By parity copying I meant the following: I had an array with 1 HDD in it that contains data. I stopped the array. I added a parity drive. Now when starting up the array the parity disk has to write to copy the original HDD data. Bought the disks from an old colleague, told me they were previously unused. (3 TB Seagate x2) I will attach new diagnostics, note that these are after stopping and starting the array. If this makes a difference I can try and run the parity check tomorrow again and then post diagnostics. nas-diagnostics-20210117-0015.zip Quote Link to comment
Kung-Fubick Posted January 16, 2021 Author Share Posted January 16, 2021 Couldn't find anything about the parity disk in these diagnostics so I will try to restart the array with it and submit diagnostics after that. Quote Link to comment
trurl Posted January 17, 2021 Share Posted January 17, 2021 1 hour ago, Kung-Fubick said: lingo might not be up to speed 1 hour ago, Kung-Fubick said: Now when starting up the array the parity disk has to write to copy the original HDD data Parity is built from the parity calculation by reading all the data disks then writing the calculated parity to the parity disk. While it is true that with a single data disk the result is a mirror, in the more general case of multiple data disks, parity is not a mirror (and definitely not a backup in any case), and I'm pretty sure that even in the case of a single data disk, it isn't really doing a copy, but is instead doing the parity calculation and writing the result to parity. 1 hour ago, Kung-Fubick said: try and run the parity check tomorrow You can't "check" parity until you have "built" parity. Parity disk still not connected. Check all connections, SATA and power, both ends, including splitters. Quote Link to comment
Kung-Fubick Posted January 17, 2021 Author Share Posted January 17, 2021 New diagnostics here. Tried connecting a different power cable before running the parity check too. Looks like it didnt fail this time but parity is still disabled for some reason. nas-diagnostics-20210117-1242.zip Quote Link to comment
Kung-Fubick Posted January 17, 2021 Author Share Posted January 17, 2021 Here is another diagnostics after a failed parity build. Just want to add that the parity disk that keeps failing has OK smart tests. nas-diagnostics-20210117-1755.zip Quote Link to comment
itimpi Posted January 17, 2021 Share Posted January 17, 2021 It is is worth pointing out that the 2TB disk showing as sdb look like it is not in a good state: 5 Reallocated_Sector_Ct PO--CK 086 086 010 - 18184 whether this is contributing to you problems I do not know. Quote Link to comment
Kung-Fubick Posted January 17, 2021 Author Share Posted January 17, 2021 Yeah, thanks for pointing that out, it was just an experimental drive that is around 10 years old so that wouldn't be surprising. I recently learned that the other 2 drives are around 5 years old. Quote Link to comment
JonathanM Posted January 17, 2021 Share Posted January 17, 2021 Also worth noting that the 3TB drives are a model so notorious for failing they have their own wiki about it. https://en.wikipedia.org/wiki/ST3000DM001 Quote Link to comment
Kung-Fubick Posted January 17, 2021 Author Share Posted January 17, 2021 23 minutes ago, jonathanm said: Also worth noting that the 3TB drives are a model so notorious for failing they have their own wiki about it. https://en.wikipedia.org/wiki/ST3000DM001 So the Seagate IronWolf ST4000VN008 64MB 4TB would be better? Quote Link to comment
trurl Posted January 17, 2021 Share Posted January 17, 2021 1 hour ago, Kung-Fubick said: just an experimental drive that is around 10 years old You can't allow untrustworthy drives in your parity array. In order to reliably rebuild all bits of a disk, it must be able to reliably read all bits of parity PLUS all bits of all other disks. Quote Link to comment
Kung-Fubick Posted January 17, 2021 Author Share Posted January 17, 2021 Just now, trurl said: You can't allow untrustworthy drives in your parity array. In order to reliably rebuild all bits of a disk, it must be able to reliably read all bits of parity PLUS all bits of all other disks. Yes, I realized that but checking if that disk works instead of my real parity disk would tell me something atleast Quote Link to comment
JonathanM Posted January 17, 2021 Share Posted January 17, 2021 1 hour ago, Kung-Fubick said: So the Seagate IronWolf ST4000VN008 64MB 4TB would be better? Possibly, but not a sure bet. At the very least you need to run a long SMART test on any drive before you use it with Unraid. Just because a specific model has a high failure rate doesn't mean all drives of that model are prone to early failure, just something to keep an eye on. I would trust one of those 3TB models that passed a long SMART and a preclear cycle more than I'd trust that 4TB if it failed SMART. Drives must be fully tested for Unraid, no point using drives that are bad or untrustworthy. Quote Link to comment
Kung-Fubick Posted January 17, 2021 Author Share Posted January 17, 2021 1 minute ago, jonathanm said: Possibly, but not a sure bet. At the very least you need to run a long SMART test on any drive before you use it with Unraid. Just because a specific model has a high failure rate doesn't mean all drives of that model are prone to early failure, just something to keep an eye on. I would trust one of those 3TB models that passed a long SMART and a preclear cycle more than I'd trust that 4TB if it failed SMART. Drives must be fully tested for Unraid, no point using drives that are bad or untrustworthy. Thank you, I will keep this in mind. I will run smart tests on my current disks over night. Thing is one of the disks (the one i'm trying to use as a parity disk) keeps dissapearing time to time. I did find that it failed a mandatory smart command so I guess that disk is quite dead. Will probably end up getting 2 new HDDs within a month. Quote Link to comment
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