February 13, 20251 yr Hi there, Let me premise that I am still inexperienced at self-hosting and only moved to Unraid months ago from a very simple rasbpi server. Today I noticed a partity disk error (first time I have it in - parity disk added a few weeks ago), which I was not quite sure how to solve and I just tried to reboot the system. Once it rebooted, the HDD that I used for parity was not detected anymore, and same goes for one of the two SSDs in my array I use for data. I tried shutting down and moving them to a different slot (I am using a Yottamster enclosure) but that didn't really change (this "trick" actually helped once in the past when I had a similar undetected disk issue). At first I thought it was a connection issue possibly caused by the enclosure but then I tried to lsblk and the two undetected disks were actually there, so I tried to manually mount the SSD and all was good, I could browse its content. I tried to follow the suggestion of this post but that didn't help. I have tried moving around the disks again and this time the parity HDD is detected (not the SSD) but I can't allocate it to the parity in the array, only to the data disk. Not sure how to proceed - I will try attaching the diagnostic file as a response to this comment, I don't seem to be able to attach it now. Thanks to anyone who could help with this.
February 13, 20251 yr Community Expert Do you have a link to the specific Yottamaster? I don't see the parity disk in those, but looks like it is supposed to be 10TB Iron Wolf HDD. Nothing assigned as disk1. SSDs in the parity array cannot be trimmed, and can only be written at parity speed. The usual place for SSDs is in pools outside the array. Unraid v7 doesn't even require you to have a parity array. Since you rebooted, can't tell what happened before. Check connections and see if you can get parity to show up. Do you plan to have other HDDs? If not maybe you don't need parity and you can just go with pools for your SSDs.
February 14, 20251 yr Author Hi trurl, Thanks for your response. This is the Yottamaster and yes, the parity disk is that 10TB one. I confirm that I had nothing assigned to disk1 and my data disks were in disk2 and disk3. Yes, I am planning to add more HDDs.
February 14, 20251 yr Community Expert USB not recommended for assigned disks, and as mentioned SSDs not recommended in the array. That enclosure might actually work better for you if you don't have an array. 1 hour ago, trurl said: Unraid v7 doesn't even require you to have a parity array.
February 14, 20251 yr Author Thanks @trurl After a few more rebooting and disk shuffling now they are visible. But I am aware that this is very precarious and far from being a safe solution. Unfortunately, I need to stick to this hardware for now, but I will follow your suggestion and will move to a setup without a USB enclosure and with HDDs to replace my SSDs as soon as I can. Anyway, any idea of why the disks are not available to be selected in the array while they are actually detected?
February 14, 20251 yr Author Sure - attached. As I said, the setup is currently working but I have not assigned back the parity disk at this point. tower-diagnostics-20250214-1942.zip
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