Hi all,

I'm having a weird problem on my 2nd Unraid server (I do not see this on my 1st server - and they both have identical setups).

Every so often I see that files become "missing" to the arr apps and Plex. I don't consistently monitor but I see that in my Discord Notifiarr notifications that Sonarr is showing that episode files were deleted due to it being "MissingFromDisk." I can verify that this is not the case by checking the filesystem through the terminal. After verifying that it's still there, if I refresh & scan in Sonarr and scan libraries in Plex (sometimes it takes multiple scans) the show comes right back up in both apps and plays fine. So odd.

This is unexpected behavior and super annoying as the show when it is re-added to Plex, it will be added again in the Recently Added. And sometimes, I'll only know this is happening because my brother or someone lets me know they can't play a show or the entire show is missing from Plex (just happened this morning).

I can't drill down what the issue is because I'm running a server with identical setup that has never seen these issues. Initial analysis of syslog and logs in sonarr don't seem to show anything that could point me in the direction to solve this. I've temporarily disabled my hdd_cache (download cache) to see if that has anything to do with this.

Additional information:

File structure:

mnt/

..└── user/

....└── data/

......├── media/

......│ ├── movies

......│ └── tvshows

......└── .downloads/

........├── tmp

........└── completed

Diagnostics:
hydra-diagnostics-20250520-1400.zip.download.zip

Sonarr logs:

sonarr.txt

What other info can I provide to hopefully figure out why this is happening?

Appreciate the help!

Edited May 20, 20251 yr by ksp

I am having this exact same issue, from what I can tell it just started since I upgraded from 6. This is also at the same time my USB thumb drive failed and I had to migrate to a new one. However my docker settings and everything else has not changed.

What I first noticed is sabnzbd would pause and have an error that it couldn't write to the output folder. All I would do is unpause and it would start working again. Because the folder exists and nothing changed, it is just like it lost visibility of it. This was the only initial problem I noticed, until a few days ago I realized in Plex went from about 1000 shows to only showing 40 the other day. A refresh starts to bring them back, but then they start disappearing again. So I have disabled cleaning trash after scan, so at least the shows stay visible, they just show unavailable until I rescan.
I have not been able to figure this out, and have had trouble trying to find someone else with this same issue.

Usually this effect happens if disks (some) have been spun down.

The wakeup on access takes a lot of time (20-40s depending on the drive), some programs are impatient and give up waiting telling you that they cannot access that folder.

Try to disable Disk Powerdown and see if your Problem vanishes.

(also get rid of "powertop" if you use it, it does no good job on 7.x)

I don't use powertop, I also have never seen my drives ever spin down, I never cared enough to look into why. I also use folder caching with very aggressive settings.

I did go ahead and disable spin down and it has not changed anything.

Also in the case of my sabnzbd not seeing the incoming share, that share is strictly on an nvme cache pool and not on spinning drives.

@ksp did you try this and see if it helps your issue?

Here is the link to the post I created that has a diagnostics file from my system.

On 5/21/2025 at 12:03 AM, MAM59 said:

Usually this effect happens if disks (some) have been spun down.

The wakeup on access takes a lot of time (20-40s depending on the drive), some programs are impatient and give up waiting telling you that they cannot access that folder.

Try to disable Disk Powerdown and see if your Problem vanishes.

(also get rid of "powertop" if you use it, it does no good job on 7.x)

So I gave this a go as per your recommendation (and I don't use powertop). I'm not sure if it's fully worked as I did still have 1 show go "missing" randomly but the shows that would routinely go missing hasn't happened (yet, since this is still a small timeframe). Will keep it this way until I definitively see it go one way or another.

This is odd because my other server doesn't require this (it has default spin down delay and likely never even spins down from what I can tell).

11 hours ago, sfef said:

I don't use powertop, I also have never seen my drives ever spin down, I never cared enough to look into why. I also use folder caching with very aggressive settings.

I did go ahead and disable spin down and it has not changed anything.

Also in the case of my sabnzbd not seeing the incoming share, that share is strictly on an nvme cache pool and not on spinning drives.

@ksp did you try this and see if it helps your issue?

Here is the link to the post I created that has a diagnostics file from my system.

Gave it a go, unsure if that's the actual case or something else. Could just be a coincidence, but seeing less shows go missing. It's only been a day so will update after maybe a week or so.

4 hours ago, ksp said:

This is odd because my other server doesn't require this

not really odd.

Disks take a different time to spin up, maybe you have caught a really slow one?

Also, it makes a great difference if you spin them up one after the other or all at the same time.

(You can control this by setting up "spin up groups", all drives within a group will be waked up at the same time. drives outside the group only wake up if they are accessed.)

20 hours ago, MAM59 said:

not really odd.

Disks take a different time to spin up, maybe you have caught a really slow one?

Also, it makes a great difference if you spin them up one after the other or all at the same time.

(You can control this by setting up "spin up groups", all drives within a group will be waked up at the same time. drives outside the group only wake up if they are accessed.)

So I'm experiencing the same issues again. Entire shows are going "missing" again even though they exist on disk. I turned off spin down on all the disks. I don't think this is related to the disks spinning down then? Any other ideas as to what is causing this behavior?

Pulling my hair out trying to solve this D:

30 minutes ago, ksp said:

Pulling my hair out trying to solve this D:

Lucky you! You still have hair to pull :-) 🤣

But I agree, the "spin down" idea does not seem to be the culprit... Sorry, I am out here then...

Edited May 23, 20251 yr by MAM59

On 5/23/2025 at 10:23 AM, MAM59 said:

Lucky you! You still have hair to pull :-) 🤣

But I agree, the "spin down" idea does not seem to be the culprit... Sorry, I am out here then...

Hahah. Unfortunate but thanks for trying!

On 5/21/2025 at 9:39 PM, sfef said:

I don't use powertop, I also have never seen my drives ever spin down, I never cared enough to look into why. I also use folder caching with very aggressive settings.

I did go ahead and disable spin down and it has not changed anything.

Also in the case of my sabnzbd not seeing the incoming share, that share is strictly on an nvme cache pool and not on spinning drives.

@ksp did you try this and see if it helps your issue?

Here is the link to the post I created that has a diagnostics file from my system.

I'm going to replace the SATA cables Monday to see if it may have anything to do with that. Let me know if you are able to solve this because it's borderline unusable because of how often it's happening.

Ran memory test today and was seeing a lot of errors. Replacing my ram with ECC modules tomorrow when they come in.

@sfef Maybe try running a memory test and see if you are having similar issues.

Thank you for the update. I have been wondering if I've been having some failing hardware. I've been looking for a reason to get a new motherboard and newer CPUs.
I will let you know if I get a chance to run a memtest.

I have still been seeing this, I am wondering if it has anything to do with possible overheating. Back when I did the update I also was messing with my IPMI settings and reset it and I believe my fans are running slower than they used to. I am needing to take the server down and get into the BIOS to tweak the fan settings to get the RPM's up on all of them. I am thinking my HBA card is overheating and potentially causing the connection issue to the backplane for all of my drives.

However as I type this out, that would possibly explain why plex loses access to folders, but that would not explain why my dockers will lose access to my cache drives. They are all NVME and run on PCIe adapter cards.
I honestly haven't had the chance to work on it at all the past couple weeks.

On 6/4/2025 at 7:18 PM, sfef said:

I have still been seeing this, I am wondering if it has anything to do with possible overheating. Back when I did the update I also was messing with my IPMI settings and reset it and I believe my fans are running slower than they used to. I am needing to take the server down and get into the BIOS to tweak the fan settings to get the RPM's up on all of them. I am thinking my HBA card is overheating and potentially causing the connection issue to the backplane for all of my drives.

However as I type this out, that would possibly explain why plex loses access to folders, but that would not explain why my dockers will lose access to my cache drives. They are all NVME and run on PCIe adapter cards.
I honestly haven't had the chance to work on it at all the past couple weeks.

Yeah this is weird. After swapping the RAM with ECC RAM and running smart tests, no more errors but the issue still persists. Consistently my apps will show folders as "missing". Might be a faulty SATA controller on my hardware.

I'm going to build a completely new server here shortly and just transfer the USB drive and all the other drives. Hoping that will finally end all these nonsense errors.

This "issue" is over 10 years old and occures sometimes.

All you can do is a rescan of the Library and then wait for the next event...

10 hours ago, Zonediver said:

This "issue" is over 10 years old and occures sometimes.

All you can do is a rescan of the Library and then wait for the next event...

Your saying Unraid dropping drives/folders is a 10 year old issue? I have used Unraid for at least 7 years and have never experienced this. I also think if this was something that happened regularly we would have been able to find more forum topics regarding it. All the ones I've seen are not like this.
I am still trying to decide what I am going to do, I've been thinking of upgrading for awhile. This is about my 2nd version of my server built 3 years ago. I am really thinking of just getting away from the used older server hardware and get a top of the line Z890 motherboard with Intel Ultra 7 265K, yes I do like overkill. haha. I just haven't found a good older or used option that I think is worth it.

Current: Dual Xeon E5-2690 v4 on Z10PE-D16 WS

128gb ram ECC

Array: 252TB (21disk + 2parity)

Cache1: 675GB (3x500GB SSSD)

Cache2: 2TB NVME

Cache3: 1TB SSD

Cache4: 2TB NVME

Cache5: 3.7TB (4x2TB NVME)

Yes that is 33 drives I have and again I've not encountered this before.

@ksp What are you thinking of building?

I would rather look a the software. Throw out "plex" and use something else instead. My Kodi never missed a file so far...

14 hours ago, sfef said:

Your saying Unraid dropping drives/folders is a 10 year old issue?

The "Drop" in my case is not unraid related - its a Plex-Issue...

22 hours ago, sfef said:

Your saying Unraid dropping drives/folders is a 10 year old issue? I have used Unraid for at least 7 years and have never experienced this. I also think if this was something that happened regularly we would have been able to find more forum topics regarding it. All the ones I've seen are not like this.
I am still trying to decide what I am going to do, I've been thinking of upgrading for awhile. This is about my 2nd version of my server built 3 years ago. I am really thinking of just getting away from the used older server hardware and get a top of the line Z890 motherboard with Intel Ultra 7 265K, yes I do like overkill. haha. I just haven't found a good older or used option that I think is worth it.

Current: Dual Xeon E5-2690 v4 on Z10PE-D16 WS

128gb ram ECC

Array: 252TB (21disk + 2parity)

Cache1: 675GB (3x500GB SSSD)

Cache2: 2TB NVME

Cache3: 1TB SSD

Cache4: 2TB NVME

Cache5: 3.7TB (4x2TB NVME)

Yes that is 33 drives I have and again I've not encountered this before.

@ksp What are you thinking of building?

Hello,

I thought I had a system at 7drives + 1 Parity and 104Tb, oh I have some catching up to do!! Nice though, I am just about to do an upgrade with the Intel Core Ultra 7 265K and MSI PRO Z890-P Wifi MB, I know it is overkill but the Ultra 7 265K was on sale as well as the motherboard making it a better buy than going with something older, so why go with 2 yrs old tech when I can get the latest..

I have been having this issue and others with my 13yr old system, so seemed like time for an upgrade. I am wondering about the overheating issues others have talked about, I know that when my CPU temp gets up there, dockers just start stopping on the system. I will say that years ago, before Unraid, and all the "ARR" programs, I just was ripping my huge DVD collection. I found Plex and put it on my system to connect media library to my TV, a few months in, I woke up to find my Movie drive completely empty, no files what so ever. This was at a time when I didn't have access to internet where I lived, so computer wasn't connected, and the only media software on there was Plex. I got rid of it for years after that, I have since gone back to it, it's way too easy to connect to remotely and I travel quite a bit. But before i let loose with my whole media library I did a test run with Minimal access. (I also went back because I had a lifetime subscription) I have thought of looking into other options, but the remote connecting, is just too easy. All the other options require way too much, and I would have to go setup my parents, and my sisters, where as with Plex I just sent them a link in email and they were up and running in no time.

I do still have problems with things not showing up in library, but i think that is just due to the OLD system I have, i7 3rd or 4th Gen.

On 6/13/2025 at 12:22 PM, Zonediver said:

This "issue" is over 10 years old and occures sometimes.

All you can do is a rescan of the Library and then wait for the next event...

Nah, my other server NEVER experiences this. It's definitely not expected behavior. Have tried rooting hardware so gonna start brand new once the parts come in. My older server with older hardware and more disks never once experiences this issue so yes, it's a real issue.

On 6/13/2025 at 11:22 PM, sfef said:

Your saying Unraid dropping drives/folders is a 10 year old issue? I have used Unraid for at least 7 years and have never experienced this. I also think if this was something that happened regularly we would have been able to find more forum topics regarding it. All the ones I've seen are not like this.
I am still trying to decide what I am going to do, I've been thinking of upgrading for awhile. This is about my 2nd version of my server built 3 years ago. I am really thinking of just getting away from the used older server hardware and get a top of the line Z890 motherboard with Intel Ultra 7 265K, yes I do like overkill. haha. I just haven't found a good older or used option that I think is worth it.

Current: Dual Xeon E5-2690 v4 on Z10PE-D16 WS

128gb ram ECC

Array: 252TB (21disk + 2parity)

Cache1: 675GB (3x500GB SSSD)

Cache2: 2TB NVME

Cache3: 1TB SSD

Cache4: 2TB NVME

Cache5: 3.7TB (4x2TB NVME)

Yes that is 33 drives I have and again I've not encountered this before.

@ksp What are you thinking of building?

Nice, I'm not going that overkill but will modernize with this:

• Intel i5-14600k - iGPU more than capable for Plex

• Thermalright CPU cooler

• Z790 ATX motherboard with 8 sata ports and a couple m.2 slots and pcie expansion slots

• 32gb ddr5 ram (no ecc, since not compatible)

• Mid tower case with lots of disk space (darkrock classico storage master is nice)

• Use a PSU I have laying around

Going for cheap but modern. It's a second server anyway so no point in going crazy.

On 6/14/2025 at 12:25 AM, MAM59 said:

I would rather look a the software. Throw out "plex" and use something else instead. My Kodi never missed a file so far...

My Plex on another server never misses a file. And if you read the post you'd see that it's not just Plex. All the arrs and everywhere else also see it as missing.

23 hours ago, Zonediver said:

The "Drop" in my case is not unraid related - its a Plex-Issue...

Mine is. It's not isolated to Plex if you read the post you'd know.

@ksp Are there no issues with the 14th gen intel? I kept reading to avoid 13th & 14th gen. So I was kind of looking at either 12th or just going straight to the 15th.

On 6/14/2025 at 9:51 PM, TxCrudeHauler said:

Hello,

I thought I had a system at 7drives + 1 Parity and 104Tb, oh I have some catching up to do!! Nice though, I am just about to do an upgrade with the Intel Core Ultra 7 265K and MSI PRO Z890-P Wifi MB, I know it is overkill but the Ultra 7 265K was on sale as well as the motherboard making it a better buy than going with something older, so why go with 2 yrs old tech when I can get the latest..

I have been having this issue and others with my 13yr old system, so seemed like time for an upgrade. I am wondering about the overheating issues others have talked about, I know that when my CPU temp gets up there, dockers just start stopping on the system. I will say that years ago, before Unraid, and all the "ARR" programs, I just was ripping my huge DVD collection. I found Plex and put it on my system to connect media library to my TV, a few months in, I woke up to find my Movie drive completely empty, no files what so ever. This was at a time when I didn't have access to internet where I lived, so computer wasn't connected, and the only media software on there was Plex. I got rid of it for years after that, I have since gone back to it, it's way too easy to connect to remotely and I travel quite a bit. But before i let loose with my whole media library I did a test run with Minimal access. (I also went back because I had a lifetime subscription) I have thought of looking into other options, but the remote connecting, is just too easy. All the other options require way too much, and I would have to go setup my parents, and my sisters, where as with Plex I just sent them a link in email and they were up and running in no time.

I do still have problems with things not showing up in library, but i think that is just due to the OLD system I have, i7 3rd or 4th Gen.

That is an older system you have. It is too hard to give up Plex, the metadata the ease of sharing and the it just works (most of the time :-)
Your problems with things not showing up, is it where they were showing but are now no longer showing? Or is it possibly a naming issue or something where Plex never showed it?
Have you already started buying the new hardware? I haven't yet, I am very indecisive about choosing. At this rate I probably won't get my new system built until this fall/winter.

Hello Sfef,

Yes I purchased an MSI Pro Z890-P Wifi board with Core Ultra 7 265K processor, Just received it 15 min ago, so will be installing in a bit. Let me say that the files or movies not being there, until i saw this post, I kinda thought it was my mind going. Like oh i must have put that on system and then not had plex scan for it... Or thinking that maybe i didn't have that show on the system, even though i know it was a fav movies and there is no way it wouldn't have been in my collection. Now the big one happened a week or so ago, (it is tornado and storm season here in north Texas) we had a power outage and when system came back up, Plex, Radarr, and Sonarr had all lost their connections to media. (I know I need a UPS backup, but mine died and haven't gotten a new one). This is the first time that everything lost connection, so figuring there must be some kind of un diagnose memory error with the system, being so old and slow I figure just upgrade it.

On Plex, it is so easy, but they sent out email to everyone with a Free account telling them that If they wanted to stream remotely, the would have to purchase an account. (which scared my family that is connected, thinking now they had to purchase an account). I purchased an account right after i started using it to support the developers, but this just seemed like a greed thing. How long is it going to be before they make me have paid accounts for all the systems I have attached to my main server?? So I would like to find an easy alternative to have in the background just in case.

Well I have talked to a few ppl about this upgrade, hopefully I have it all figured out and it goes smoothly, Don't really want to have to install my whole Docker system again. Keep your fingers crossed for me.

2 hours ago, TxCrudeHauler said:

Hello Sfef,

Yes I purchased an MSI Pro Z890-P Wifi board with Core Ultra 7 265K processor, Just received it 15 min ago, so will be installing in a bit. Let me say that the files or movies not being there, until i saw this post, I kinda thought it was my mind going. Like oh i must have put that on system and then not had plex scan for it... Or thinking that maybe i didn't have that show on the system, even though i know it was a fav movies and there is no way it wouldn't have been in my collection. Now the big one happened a week or so ago, (it is tornado and storm season here in north Texas) we had a power outage and when system came back up, Plex, Radarr, and Sonarr had all lost their connections to media. (I know I need a UPS backup, but mine died and haven't gotten a new one). This is the first time that everything lost connection, so figuring there must be some kind of un diagnose memory error with the system, being so old and slow I figure just upgrade it.

On Plex, it is so easy, but they sent out email to everyone with a Free account telling them that If they wanted to stream remotely, the would have to purchase an account. (which scared my family that is connected, thinking now they had to purchase an account). I purchased an account right after i started using it to support the developers, but this just seemed like a greed thing. How long is it going to be before they make me have paid accounts for all the systems I have attached to my main server?? So I would like to find an easy alternative to have in the background just in case.

Well I have talked to a few ppl about this upgrade, hopefully I have it all figured out and it goes smoothly, Don't really want to have to install my whole Docker system again. Keep your fingers crossed for me.

Good luck, I can't wait to hear how it goes. From what I was reading the newest unraid version has the newer kernel so all of the cores and the graphics encoding should be supported. Hopefully with the Dockers your templates are good and you can really just recreate them from that without having to make many changes. If you didn't know the system should save your dockers as a template file and should include your changes to the base template. Hopefully you have them setup where they store their data in a folder on the system and it isn't within the docker image. That way your data persists if you destroy a docker and recreate the base data/config files for the apps should exist.

Did my install, now i need a new case, there just isn't enough room in this one. With the case around the i/O ports on the back, that unit is too big for my water cooler to fit. I only had one issue and was sure what it was, I tried installing the R1825 Driver from the apps just before shutting down and changing, that booted up, but couldn't access network. I grabbed Maximo101's driver files he uploaded here, deleted the one's from the apps and it all worked perfect. Just don't forget to update BIOs to latest version!! Everything was there, didn't have to reload any containers or software.

On 6/16/2025 at 2:43 PM, sfef said:

@ksp Are there no issues with the 14th gen intel? I kept reading to avoid 13th & 14th gen. So I was kind of looking at either 12th or just going straight to the 15th.

Not too worried on an i5 tbh, i7 and up maybe. Reports are overblown tbh, have multiple systems doing fine on 14th gen.

Parts are here so I’ll be building it out this Saturday and swapping over. Will post results here.

Edited June 19, 20251 yr by ksp