March 21, 20206 yr Hi all, I’m pretty new to unraid so just finding my way... I’m experiencing a rather annoying issue with an Unassigned Devices mounted SSD. After a while of no writes the drive disappears into the historical devices category. A reboot of the server restores the drive every time. The drive will stay up for hours if reads are continuous (hold music collection for Roon), if reads then cease it goes down after a few minutes (not tested scientifically). The drive is a Crucial MX500 1tb, I have two of these and both exhibit the same behaviour. I can only think this is something to do with the drives going into a power saving mode and not starting back up? I’m not experiencing any issues with my array or cache and the SSDs are new. Would be super great if anyone could offer any suggestions or point me in the right direction! Cheers.
March 22, 20206 yr Author Hi, thanks for offering to take look. My Syslog is attached... Syslog 220320.txt
March 22, 20206 yr Community Expert It's dropping offline, likely a SATA/power cable problem, try replacing or swapping them, you could also use a different controller, since trim won't work on the LSI HBA.
March 22, 20206 yr Author Thanks, I’ll try that. I think I had a couple of spare mini SAS cables to swap. In terms of controller would a LSI 9300 be the right thing? Cheers.
March 22, 20206 yr Community Expert Best bet would be the onboard SATA ports, or an AHCI controller like Asmedia/JMB, all LSI HBAs require SSDs with deterministic read zeros after trim or it won't work, most other 8 port HBAs/RAID controllers also don't support trim.
March 22, 20206 yr Author Thanks for the advice, I'll look into what's available I guess the current situation means I won't be getting anything too quick... I've swaped over to a new set of mini sas cables and an alternative sas config cable and switched the power over between the backplanes... Hopefully that'll solve it, should know soon enough.
March 22, 20206 yr Author Unfortunately still getting the same behaviour after switching the cables around... damnit! Seems to me a really odd behaviour that it works continuously (empirically) if I leave the music playing but as soon as I pause the SSD goes down within a few minutes... Could this perhaps be something to do with the IBM X3650 M3 in another aspect, but then the array and cache are stable? Dies when it goes idle, what could cause that or is just a case of a new controller being required as johnnie.black has suggested? Syslog 220320 2.txt
March 23, 20206 yr Community Expert If a new cable didn't help it might just be a compatibility issue, why it would be good to test it on a different controller.
March 30, 20206 yr Author Managed to get the SSD plugged into the onboard sata port on the X3650 with a bit of cable fiddling!! That seems to have fixed the problem, the SSD no longer disappears and seems solid so far... so a compatibility issue? Thanks.
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