NVME cache drive routinely goes missing


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I bought a ADATA SX8100NP to replace my smaller capacity Samsung 850 EVO a while back. The Adata drive has been running fine but recently it will just disappear from the array and won't show until I completely shutdown and restart the server. I tried re-seating it the very first time it happened but recently the issue kept coming back. I forgot to grab the full diagnostics from last time before I restarted the server but I've attached SMART report. I've been reading mixed info about SMART tests on NVME drives so I'm not sure if this is an indication there's something wrong with the drive's functionality. 

 

The drive is plugged in directly to my motherboard (B450 Tomahawk Max) via the M.2 slot. 

ADATA_SX8100NP_2J3620078167-20200618-0908.txt

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  • 5 months later...

Picking back up on this old thread since the problem still persists and has been appearing here and there since the last time I posted. I was able to grab the diagnostics from the most recent time when this happened and it seems to start with the I/O errors on the nvme drive, similar to the linked post. However I don't think the drive temperatures ever exceeded 40C in my case. 

 

The system logs are unfortunately cluttered with a lot of FTP logs so the first error starts around line 8980.

 

My array is on xfs and I've since switched the cache drive in question to xfs from btrfs. However, I do have xfs, ntfs, and btrfs drives in use through UD. 

tower-diagnostics-20201127-1739.zip

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Did you try what in the first link, if not do it.

 

Some NVMe devices have issues with power states on Linux, try this, on the main GUI page click on flash, scroll down to "Syslinux Configuration", make sure it's set to "menu view" (on the top right) and add this to your default boot option, after "append" and before "initrd=/bzroot"

 

nvme_core.default_ps_max_latency_us=0

Reboot and see if it makes a difference.

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  • 1 month later...

hey,

any updates on this?

 

i've experienced same "missing NVMe cache drive" situation with 1 of the 2 cache drives (in a pool) goes missing. using 2x Samsung 980_PRO 1TB.  it happens often enough to be annoyed.

from the log i can see these lines when it happened:
Jan 20 18:32:54 JJ-NAS kernel: nvme nvme0: controller is down; will reset: CSTS=0x3, PCI_STATUS=0x2010
Jan 20 18:33:51 JJ-NAS login[402]: ROOT LOGIN  on '/dev/pts/0'
Jan 20 18:33:56 JJ-NAS kernel: nvme nvme0: I/O 16 QID 0 timeout, disable controller
Jan 20 18:34:16 JJ-NAS kernel: nvme nvme0: Device not ready; aborting reset
Jan 20 18:34:16 JJ-NAS kernel: nvme nvme0: Identify Controller failed (-4)
Jan 20 18:34:16 JJ-NAS kernel: nvme nvme0: Removing after probe failure status: -5
Jan 20 18:34:16 JJ-NAS kernel: BTRFS error (device nvme1n1p1): bdev /dev/nvme0n1p1 errs: wr 75281, rd 7, flush 15132, corrupt 0, gen 0
Jan 20 18:34:16 JJ-NAS kernel: BTRFS error (device nvme1n1p1): bdev /dev/nvme0n1p1 errs: wr 75282, rd 7, flush 15132, corrupt 0, gen 0

errors continue...

 

after a drive goes missing i still can see Cache "active" and SMART showing healthy, but no temp showing.  Entering Cache Self-test shows that disk is not available and must be spun up, clicking "Spin Up" does nothing. 

reboot does not bring back the drive.  it looks like a shutdown and hard press start does (i did enter the BIOS though and exited without save).

 

thanks in advance for any help / suggestions

 

mobo: ASROCK X570M Pro4 (BIOS P3.30)

CPU: Ryzen 3400G

RAM: 32GB

Cache Pool: 2x Samsung NVMe 980 PRO 1TB

Array: 4x 8TB Seagate IronWolf

Parity: 1x 12TB Seagate IronWolf

 

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7 hours ago, onufry said:

thanks in advance for any help / suggestions

Look for a BIOS update and or try the latest Unraid -rc, if that doesn't help not much more you can do other than using different NVMe deiveces or a different board.

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14 hours ago, onufry said:

hey,

any updates on this?

 

i've experienced same "missing NVMe cache drive" situation with 1 of the 2 cache drives (in a pool) goes missing. using 2x Samsung 980_PRO 1TB.  it happens often enough to be annoyed.

from the log i can see these lines when it happened:
Jan 20 18:32:54 JJ-NAS kernel: nvme nvme0: controller is down; will reset: CSTS=0x3, PCI_STATUS=0x2010
Jan 20 18:33:51 JJ-NAS login[402]: ROOT LOGIN  on '/dev/pts/0'
Jan 20 18:33:56 JJ-NAS kernel: nvme nvme0: I/O 16 QID 0 timeout, disable controller
Jan 20 18:34:16 JJ-NAS kernel: nvme nvme0: Device not ready; aborting reset
Jan 20 18:34:16 JJ-NAS kernel: nvme nvme0: Identify Controller failed (-4)
Jan 20 18:34:16 JJ-NAS kernel: nvme nvme0: Removing after probe failure status: -5
Jan 20 18:34:16 JJ-NAS kernel: BTRFS error (device nvme1n1p1): bdev /dev/nvme0n1p1 errs: wr 75281, rd 7, flush 15132, corrupt 0, gen 0
Jan 20 18:34:16 JJ-NAS kernel: BTRFS error (device nvme1n1p1): bdev /dev/nvme0n1p1 errs: wr 75282, rd 7, flush 15132, corrupt 0, gen 0

errors continue...

 

after a drive goes missing i still can see Cache "active" and SMART showing healthy, but no temp showing.  Entering Cache Self-test shows that disk is not available and must be spun up, clicking "Spin Up" does nothing. 

reboot does not bring back the drive.  it looks like a shutdown and hard press start does (i did enter the BIOS though and exited without save).

 

thanks in advance for any help / suggestions

 

mobo: ASROCK X570M Pro4 (BIOS P3.30)

CPU: Ryzen 3400G

RAM: 32GB

Cache Pool: 2x Samsung NVMe 980 PRO 1TB

Array: 4x 8TB Seagate IronWolf

Parity: 1x 12TB Seagate IronWolf

 

 

Yea it sounds like the same kind of error I was seeing. Rebooting the entire array multiple times can sometimes bring the cache back -- otherwise I usually had to do a hard reset. Even adding 

nvme_core.default_ps_max_latency_us=0

as suggested by JorgeB didn't help. I also tried switching the file system on the NVME from btrfs to xfs, no success. It could have been a power state issue could sometimes pop up without any activity on the drive (so the temp of the drive would just be at idle temp).

 

Perhaps a BIOS update could help like JorgeB mentioned. My motherboard is a MSI Tomahawk B450 MAX v.7C02v35 paired with a Ryzen 2700X but I've never tried updating the BIOS to resolve this issue.

 

Eventually I gave up trying to diagnose the problem and switched over to a WD NVME drive. Have been solid ever since. Interestingly, I don't have a heat sink on this one whereas I did on the ADATA but temps have been fine. 

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11 hours ago, JorgeB said:

Look for a BIOS update and or try the latest Unraid -rc, if that doesn't help not much more you can do other than using different NVMe devices or a different board.

thanks,

my bios has the latest version. i did already try switching to different NVMe.  originally i used Sabrent and now Samsung - same issues.

it seems trying unraid 6.9 RC is my next option to try. 

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On 1/21/2021 at 2:31 PM, onufry said:

thanks,

my bios has the latest version. i did already try switching to different NVMe.  originally i used Sabrent and now Samsung - same issues.

it seems trying unraid 6.9 RC is my next option to try. 

yet another update. 

for past few days i started to monitor dashboard, and i've noticed that my CPU spikes to 70% and hover around that without dropping.  checked top and saw ffmpeg was a culprit.  after restarting Jellyfin CPU usage went to "my system average"  <15%.  obviously CPU, Mobo temps also dropped. i have not had NVMe gone missing for these few days. 

so, i  my very ignorant opinion, i suspect that (as someone mentioned elsewhere) missing cache NVMe has to do with drive controller temperature sensor triggering fail-safe.  

thoughts?   

Edited by onufry
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  • 1 month later...

I'm facing this too recently when my son starts playing any game on Windows VM (GPU Pass-Through). Otherwise everything works fine for days! Latest BIOS updated. Unraid 6.9.1 updated. Used two suggestions from discussion topics:

amd_iommu=pt nvme_core.default_ps_max_latency_us=0

But still no difference.

I'd occasionally get messages about cache disk temperature rising to 56-57 deg and then sometimes it resulted in cache disk going missing when it crossed 60 deg. But now, there is no temperature indication what-so-ever and as soon as game is turned on within 3 mins the cache disk goes missing. Please help. 

kraken-diagnostics-20210329-1303.zip

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3 minutes ago, Pushy said:

I'm facing this too recently when my son starts playing any game on Windows VM (GPU Pass-Through).

 

NVMe controller is going down:

 

Mar 29 13:02:29 Kraken kernel: nvme nvme0: controller is down; will reset: CSTS=0xffffffff, PCI_STATUS=0x10

 

If you're already on the latest BIOS not much else you can do, try a different M.2 slot if available, you can also try disabling PCIe ACS override if not needed.

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  • 3 months later...

On my system, I have always had PCIe ACS override set to "Both" and never had issues with the NVMe cache, but today I tried setting PCIe ACS to "Disabled" and also tried "Downstream", and in those modes I got the "disk missing" from the cache drive every time I tried to startup the array.

 

This makes some sense, since NVMe is a PCIe device, so I just wanted to add this incase it's helpful to someone

 

In summary, if you get those "device ... Missing" errors with an NVMe drive as cache drive, it might help to try each of the possible options for the "PCIe ACS override" setting, to see if one of those options fixes that cache issue. 

The results will probably be different for everyone depending on your motherboard and probably also your arrangements of any other PCIe devices

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