October 27, 2025Oct 27 Hello all,I have a strange one that I am trying to wrap my head around.Earlier yesterday, the system lost power and thus triggered a parity check. Everything was seemingly running correctly but after a few hours one of my newest to me(renewed) 24tb sata drives was missing after posting around 1000 errors. Thinking that this might just be a bad disk, I replaced it.Odd thing is now the second parity drive is missing. I did reseat the HDD while trying to locate the one failed drive, but it's there. I tried reseating and swapping both of the parity drives and still it fails to show up.Just for grins I did test the 'failed' HDD on a secondary system and it seems to be fine. I was able to format it and write some test files to it.I know logs will be requested but I did power off the sysstem as it's entirely unprotected at the moment.Any rough clues or ideas? the specific drives in question are MDD sata 24tb. MDD23tsata51272e Edited October 27, 2025Oct 27 by mathomas3
October 27, 2025Oct 27 Community Expert Power or sata cables are typically the culprits. Posting your diagnostics will likely get the attention of the smart folk.
October 27, 2025Oct 27 Author Logs are attached Though they are off of a fresh reboot and some details from the lost disk are not included tower-diagnostics-20251027-1816.zip
October 29, 2025Oct 29 Author If I recall correctly... I had to play with the position of the hdds to make everything work/talk... I tried moving some things around and still the old parity drive isnt found... in this posted diag, the new disk isnt attached and the old/'working' parity drive is in a new drive bay... still not found... advise?!? tower-diagnostics-20251028-2030.zip
October 29, 2025Oct 29 Author On 10/27/2025 at 8:59 AM, Veah said:Power or sata cables are typically the culprits. Posting your diagnostics will likely get the attention of the smart folk.I hear you... but with a 24 bay enclosure either everything works or nothing does... per my expirance, but for the typical user here... that's sound advise
October 29, 2025Oct 29 Community Expert Yeah I thought of that after I wrote it. Hopefully it's not something wrong with the backplane.
October 30, 2025Oct 30 Author I tried moving around the HDDs to different slots and they are still missing. For the life of me I cant logically figure this one out. Loss power. Bring it back online with one missing disk. I replace it and then the other parity drive goes missing. My entire array is SAS disks and these newer HDDs are sata. Perhaps that's why? But why would they work one day and then the next go dark...
October 30, 2025Oct 30 Author I went ahead and ordered up some 22tb SAS drives. It would be nice to know if these disks are SOL or...
October 30, 2025Oct 30 Community Expert If the disks are not being detected, not much else can be done, you need to figure out why, e.g, connect one of the missing disks directly to the server, bypassing the backplane, does that work?
October 30, 2025Oct 30 Author I took one of the 'failed' drives and connected it directly to a laptop and it was found, needed to reformate the disk to be accessed, but it woked fine...
October 31, 2025Oct 31 Community Expert I would recommend connecting that same drive to a server controller, but bypassing the backplane, that should help confirm that is the problem.
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