Last year I added one of these drives to use for the things I needed most speed and reliability for: appdata, VMs, all that good stuff. Formatted as ZFS so I can use Spaceinvader One's snapshot & replication script to keep safe versions of everything on the array. After a month or two, I started having server crashes. After much head scratching, the issue turned out to be the 990 Pro. It would disappear from the system, seemingly without reason. Changing slots on the motherboard didn't help. Rebooting wouldn't help, but it would always reappear after a power cycle. The firmware was out of date, but updating it didn't help. The vendor replaced it under warranty (the replacement had a later manufacturing date and came with the latest firmware) and that drive's been fine since. Even with the replication and multiple backups, I had a fair bit of trouble getting everything restored and swapped over to the new drive and wanted to minimise the chances of that happening again, so I purchased a second 4TB 990 Pro at a discount from a guy on ebay who was selling a lot of SSDs. It was an older manufacturing date, so the first thing I did was update the firmware, then I set that as a mirror of the first drive and all was well. After a few weeks, I checked the status and found that the drive was offline. Exactly the same was happening- it would disappear, a reboot wouldn't help, but a power cycle would bring it back. So I returned that for a full refund and bought another one from a reputable supplier in mid January this year with a recent manufacturing date and the latest firmware. I set that as the mirror and I hoped that was the end of the issues. Then yesterday I updated Unraid to 7.0.1 - after reboot, the mirror drive was missing! I power cycled and it came back, however I now have this message: zfs pool status: pool: cache_4tb state: ONLINE status: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected. action: Determine if the device needs to be replaced, and clear the errors using 'zpool clear' or replace the device with 'zpool replace'. see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-9P scan: resilvered 34.1G in 00:00:24 with 0 errors on Tue Mar 4 00:14:54 2025 config: NAME STATE READ WRITE CKSUM cache_4tb ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 /dev/nvme2n1p1 ONLINE 0 0 0 /dev/nvme1n1p1 ONLINE 0 0 5 errors: No known data errors I checked the logs and can't find when the drive failed. It's a while since I last rebooted Unraid (probably not long after v7 was released. When the mirror drive has failed I haven't been getting any warning or notification, either in v6 or 7. The only way I've found is to go into the main drive's settings and check there. Is there a way to enable this for a failed drive in a ZFS array? As this is the 3rd time this has happened, with what should be one of the most reliable drives from one of the most reliable manufacturers, I'm starting to wonder if something else is at play here. Any help or advice would be much appreciated. tower-diagnostics-20250305-0007.zip

Device is dropping offline: Mar 6 01:36:07 Tower kernel: nvme nvme1: controller is down; will reset: CSTS=0xffffffff, PCI_STATUS=0xffff Mar 6 01:36:07 Tower kernel: nvme nvme1: Does your device have a faulty power saving mode enabled? Mar 6 01:36:07 Tower kernel: nvme nvme1: Try "nvme_core.default_ps_max_latency_us=0 pcie_aspm=off pcie_port_pm=off" and report a bug Mar 6 01:36:07 Tower kernel: nvme 0000:05:00.0: Unable to change power state from D3cold to D0, device inaccessible Mar 6 01:36:07 Tower kernel: nvme nvme1: Disabling device after reset failure: -19 try this, on the main GUI page click on the flash drive, scroll down to "Syslinux Configuration", make sure it's set to "menu view" (top right) and add this to your default boot option, after "append initrd=/bzroot" nvme_core.default_ps_max_latency_us=0 pcie_aspm=off pcie_port_pm=off e.g.: append initrd=/bzroot nvme_core.default_ps_max_latency_us=0 pcie_aspm=off pcie_port_pm=off Reboot and see if it makes a difference.

4TB Samsung 990 Pro NVMe Cache Drive: Multiple drive failures

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Solved by JorgeB

March 6, 20251 yr

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October 13, 2025Oct 13

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No issues since updating 3weeks ago...

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1 month later...

November 16, 2025Nov 16

How's the new firmware running for everyone?

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November 16, 2025Nov 16

Everything been working fine since updating, so it solved all the issues for me! : )

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November 17, 2025Nov 17

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Yeah, all been good so far for me too.

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4TB Samsung 990 Pro NVMe Cache Drive: Multiple drive failures

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