====== NVM disappers ======

Samsung SSD 990 PRO 4TB. Machine with Proxmox. During long backup of VM Proxmox host hangs. After reboot no  NVMe device detected.
  * Reinsertion of NVMe in M.2 slot helps 
    * related to temperature ?
  * Multiple reboots doesn't help even if device is cool. 
  * If NVMe device disappears only complete power off helps.

<code>
...
nvme nvme0: I/O tag 642 (8282) opcode 0x2 (I/O Cmd) QID 10 timeout, aborting req_op:READ(0) size:131072
nvme nvme0: I/O tag 642 (e283) opcode 0x2 (I/O Cmd) QID 10 timeout, aborting req_op:READ(0) size:131072
nvme nvme0: Abort status: 0x0
...
</code>

Related:

  * [[https://forum.proxmox.com/threads/problem-with-nvme-timeout-and-aborting.144492/|Problem with NVME timeout and aborting]]

Seems to help:
  * <code>nvme_core.default_ps_max_latency_us=0 pcie_port_pm=off pcie_aspm=off</code>
    * Also hangs but after long time.
  * disable ASPM in BIOS

{{.:pasted:20250610-080629.png}}