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Description:
When different fc connected block devices having same backend luns, only the latest ones displayed under /dev/disk/by-path
Versions:
kernel-4.18.0-58.el8.x86_64
systemd-udev-239-10.el8.x86_64
How reproducible:
100
Steps:
1. having a online HBA card (scsi_host5)
[root@dell-per730-58 tmp]# lsscsi
[5:0:0:0] disk IBM 2145 0000 /dev/sdb
[5:0:1:0] disk IBM 2145 0000 /dev/sdc
2. create a virtual HBA based on scsi_host5 with following wwpn/wwnn
[root@dell-per730-58 tmp]# echo "1000000000000001:20000000c99e2b80" > /sys/class/fc_host/host5/vport_create
3. check the newly connected storage, which is sdd/sde/sdf/sdg connected by vHBA scsi_host13
[root@dell-per730-58 tmp]# lsscsi
[5:0:0:0] disk IBM 2145 0000 /dev/sdb
[5:0:1:0] disk IBM 2145 0000 /dev/sdc
[13:0:0:0] disk IBM 2145 0000 /dev/sdd
[13:0:0:1] disk IBM 2145 0000 /dev/sde
[13:0:1:0] disk IBM 2145 0000 /dev/sdf
[13:0:1:1] disk IBM 2145 0000 /dev/sdg
4. check the devices under dir=/dev/disk/by-path/
[root@dell-per730-58 tmp]# ll /dev/disk/by-path/
total 0
lrwxrwxrwx. 1 root root 9 Jan 8 05:04 pci-0000:00:1f.2-ata-6 -> ../../sr0
lrwxrwxrwx. 1 root root 9 Jan 8 05:04 pci-0000:03:00.0-scsi-0:2:0:0 -> ../../sda
lrwxrwxrwx. 1 root root 10 Jan 8 05:04 pci-0000:03:00.0-scsi-0:2:0:0-part1 -> ../../sda1
lrwxrwxrwx. 1 root root 10 Jan 8 05:04 pci-0000:03:00.0-scsi-0:2:0:0-part2 -> ../../sda2
lrwxrwxrwx. 1 root root 9 Jan 11 08:07 pci-0000:06:00.0-fc-0x50050768030939b6-lun-0 -> ../../sdd
lrwxrwxrwx. 1 root root 9 Jan 11 08:07 pci-0000:06:00.0-fc-0x50050768030939b6-lun-1 -> ../../sde
lrwxrwxrwx. 1 root root 9 Jan 11 08:07 pci-0000:06:00.0-fc-0x50050768030939b7-lun-0 -> ../../sdf
lrwxrwxrwx. 1 root root 9 Jan 11 08:07 pci-0000:06:00.0-fc-0x50050768030939b7-lun-1 -> ../../sdg
5. created another virtual HBA with following wwpn/wwnn
[root@dell-per730-58 tmp]# echo "1000000000000002:20000000c99e2b80" > /sys/class/fc_host/host5/vport_create
6. check the newly connected storage, which is sdh/sdi/sdj/sdk connected by vHBA scsi_host14
[root@dell-per730-58 tmp]# lsscsi
[0:2:0:0] disk DELL PERC H730 Mini 4.27 /dev/sda
[5:0:0:0] disk IBM 2145 0000 /dev/sdb
[5:0:1:0] disk IBM 2145 0000 /dev/sdc
[11:0:0:0] cd/dvd HL-DT-ST DVD-ROM DTA0N D3C0 /dev/sr0
[13:0:0:0] disk IBM 2145 0000 /dev/sdd
[13:0:0:1] disk IBM 2145 0000 /dev/sde
[13:0:1:0] disk IBM 2145 0000 /dev/sdf
[13:0:1:1] disk IBM 2145 0000 /dev/sdg
[14:0:0:0] disk IBM 2145 0000 /dev/sdh
[14:0:0:1] disk IBM 2145 0000 /dev/sdi
[14:0:1:0] disk IBM 2145 0000 /dev/sdj
[14:0:1:1] disk IBM 2145 0000 /dev/sdk
7. check the devices under dir=/dev/disk/by-path/ again (the original sdd/sde/sdf/sdg gone, replaced by sdh/sdi/sdj/sdk with same path)
The reason is that the two wwpn/wwnn pairs actually pointing to the same backend storage. But the by-path should not just show the latest connected ones.
[root@dell-per730-58 tmp]# ll /dev/disk/by-path/
total 0
lrwxrwxrwx. 1 root root 9 Jan 8 05:04 pci-0000:00:1f.2-ata-6 -> ../../sr0
lrwxrwxrwx. 1 root root 9 Jan 8 05:04 pci-0000:03:00.0-scsi-0:2:0:0 -> ../../sda
lrwxrwxrwx. 1 root root 10 Jan 8 05:04 pci-0000:03:00.0-scsi-0:2:0:0-part1 -> ../../sda1
lrwxrwxrwx. 1 root root 10 Jan 8 05:04 pci-0000:03:00.0-scsi-0:2:0:0-part2 -> ../../sda2
lrwxrwxrwx. 1 root root 9 Jan 11 08:07 pci-0000:06:00.0-fc-0x50050768030939b6-lun-0 -> ../../sdh
lrwxrwxrwx. 1 root root 9 Jan 11 08:07 pci-0000:06:00.0-fc-0x50050768030939b6-lun-1 -> ../../sdi
lrwxrwxrwx. 1 root root 9 Jan 11 08:07 pci-0000:06:00.0-fc-0x50050768030939b7-lun-0 -> ../../sdj
lrwxrwxrwx. 1 root root 9 Jan 11 08:07 pci-0000:06:00.0-fc-0x50050768030939b7-lun-1 -> ../../sdk
Actual result:
As step 7, only the latest connected devices listed under by-path dir.
Expected result:
Even the 2 wwpn/wwnn pointing to the same backend storage, the by-path dir should show them both with different path.
Additional info:
In rhel7.6.z the problem not happened, the reason is that the device name under by-path dir has a vport info, as follow:
pci-0000:08:00.0-vport-0x1000000000000001-fc-0x50050768030539b6-lun-0
Comment 9RHEL Program Management
2021-02-01 07:31:55 UTC
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release. Therefore, it is being closed. If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.