Multipath not working

[Online]

Good afternoon!
Help solve the problem, multipath does not work. There is a SAN with 2 controllers connected via 2 FC switches to the server, in 2 ways, respectively.
A bootable LUN has been created, the proxmox system is installed on it, then the system sees 2 identical disks /dev/sdb and /dev/sdc with the same ID.
You need to configure multipath. multipath -ll is an empty result. I have already tried to configure it via uid_attribute: ID_SERIAL, ID_SERIAL_SHORT, ID_SCSI.
What could it be?

 

[waltar]

wwid. You need to start multipathd (+enable) for output of multipath -ll.

 

[LnxBil]

You want to boot also from the multipathed device? I was not able to do that. Just using the multipathed setup should work.

I really don't like the blacklist all and enable what you have. Just blacklist controllers and use what comes in. Much better approach, at least in the beginning.

 

[Online]

wwid. You need to start multipathd (+enable) for output of multipath -ll.

I also tried WWID, the service is working.

multipathd.service - Device-Mapper Multipath Device Controller
Loaded: loaded (/lib/systemd/system/multipathd.service; enabled; preset: enabled)
Active: active (running) since Wed 2024-10-02 08:51:52 +07; 3min 13s ago
TriggeredBy: ● multipathd.socket
Process: 455832 ExecStartPre=/sbin/modprobe dm-multipath (code=exited, status=0/SUCCESS)
Main PID: 455835 (multipathd)
Status: "up"
Tasks: 7
Memory: 18.9M
CPU: 68ms
CGroup: /system.slice/multipathd.service
└─455835 /sbin/multipathd -d -s

Oct 02 08:51:52 pve3 multipathd[455835]: reconfigure: setting up paths and maps
Oct 02 08:51:52 pve3 multipathd[455835]: mpathe: addmap [0 524288000 multipath 3 pg_init_retries 50 queue_if_no_path 1 rdac 2 1 round-robin 0 1 1 8:16 1 round-robin 0 1 1 8:32 1]
Oct 02 08:51:52 pve3 multipathd[455835]: libdevmapper: ioctl/libdm-iface.c(1980): device-mapper: reload ioctl on mpathe (252:5) failed: Device or resource busy
Oct 02 08:51:52 pve3 multipathd[455835]: dm_addmap: libdm task=0 error: Success
Oct 02 08:51:52 pve3 multipathd[455835]: mpathe: ignoring map
Oct 02 08:51:52 pve3 multipathd[455835]: mpathe: addmap [0 524288000 multipath 3 pg_init_retries 50 queue_if_no_path 1 rdac 2 1 round-robin 0 1 1 8:16 1 round-robin 0 1 1 8:32 1]
Oct 02 08:51:52 pve3 multipathd[455835]: libdevmapper: ioctl/libdm-iface.c(1980): device-mapper: reload ioctl on mpathe (252:5) failed: Device or resource busy
Oct 02 08:51:52 pve3 multipathd[455835]: dm_addmap: libdm task=0 error: Success
Oct 02 08:51:52 pve3 multipathd[455835]: mpathe: ignoring map
Oct 02 08:51:52 pve3 systemd[1]: Started multipathd.service - Device-Mapper Multipath Device Controller.