kmorris

Took quite a bit of effort, but everything worked out. Replaced original parity drive, rebuilt 4, then did full parity check with no errors. Decided to grab a 6tb for the parity since I was going through all the trouble and it's 12 hours into upgrading now. All good. Thank you folks.

Odd, an hour ago it was at 13%, I just refreshed and its dropped back out to maintenance mode and not doing parity check. Disk 4 shows 384 writes, and 768 errors. Every other drive including parity are at lovely 0 errors, but Main tab doesn't show me if parity is valid in maintenance mode, and Dashboard says Data is invalid under Parity Status. If I put in a 4TB to rebuild #4 but the parity is only at 3TB, will I be able to reclaim the extra space later?

7.5 hours and 13.6% complete into it, and no additional sync errors since 30 min into it... I'm betting you're right that it's drive 4, it had a couple remapped sectors on the SMART status. Actually a few drives (all Seagate 1.5TBs) started showing low counts of remapped sectors over the past couple months and the parity upgrade was the start of replacing all of them exhibiting a non-ok status with 4TB WD's I picked up recently. Stress... gotta love it.

Is a sync error the same as a parity error? Its been running 30 minutes and has 1700+ of them.

Done, thanks. Doing a parity check with no write corrections to check first, and will assess the next step from there.

I've put the 3TB back in, and assigned it, but it doesn't give me the option to trust the parity disk. Message under Array Operation is "Too many wrong or missing disks!" BTW, thank you for your help.

I'm certain nothing's been written to it from an external source, only from anything written when assigning a new parity drive to the array and starting the rebuild.

Hi, Yesterday I did a full parity check and everything was great on unRAID 6.1.6. After parity check finished this morning I powered down and replaced the 3TB parity with a 4TB; and started a rebuild. About 6 hours into it my system started showing a large number of errors on the 4th drive so unRAID warned me that parity was (obviously) invalid. It didn't occur to me to grab a system log. I stopped the rebuild, powered down and checked all the cables; turns out that the new parity drive is directly next to the drive showing errors, not only on the physical power cable, but on the pciE controller card as well. From there I removed a couple un-needed power splitters and SATA cables from the system, re-seated everything and brought the system back online. Now I've got Disk 4 showing on my system as disabled, but because the parity wasn't rebuilt I don't have it to rebuild the offline drive. The 3TB drive I swapped out contained valid parity (checked valid yesterday before I started) is still available and no changes have been written to the array from anything other than unRAID. Any idea what my options are? Is there any way to mount the offline drive on another system and copy everything off it?