Public bug reported:
We're running a server similar to BackBlaze's StoragePod, in which three
SATA-PCI-Cards (SiI 3124) each connect to three 5-port SATA PMP
backplanes (SiI 3726).
Each disk connected via one of those controllers and backplanes should
have a unique ID_PATH, which it had on Debian Squeeze.
After changing the host OS to Ubuntu 12.04.2 today I found /dev/disk/by-path/
not to be filled by the expected symlinks.
It seems udev doesn't resolve ID_PATH correctly but tries to overwrite the old
links:
root@ubuntu:~# udevadm test-builtin path_id /sys/block/sda
ID_PATH=pci-0000:02:04.0-scsi-0:0:0:0
ID_PATH_TAG=pci-0000_02_04_0-scsi-0_0_0_0
root@ubuntu:~# udevadm test-builtin path_id /sys/block/sde
ID_PATH=pci-0000:02:04.0-scsi-0:0:0:0
ID_PATH_TAG=pci-0000_02_04_0-scsi-0_0_0_0
root@ubuntu:~# udevadm test /sys/block/sda/
run_command: calling: test
adm_test: version 175
[...]
udev_device_update_db: created db file '/run/udev/data/b8:0' for
'/devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:04.0/ata1/host0/target0:0:0/0:0:0:0/block/sda'
ACTION=add
DEVLINKS=/dev/disk/by-id/ata-SAMSUNG_HD204UI_S2H7J90B804735
/dev/disk/by-id/scsi-SATA_SAMSUNG_HD204UIS2H7J90B804735
/dev/disk/by-id/wwn-0x50024e9205d4ea30
/dev/disk/by-path/pci-0000:02:04.0-scsi-0:0:0:0 /dev/disk/zpool/v0d5
DEVNAME=/dev/sda
DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:04.0/ata1/host0/target0:0:0/0:0:0:0/block/sda
DEVTYPE=disk
[...]
ID_PATH=pci-0000:02:04.0-scsi-0:0:0:0
ID_PATH_TAG=pci-0000_02_04_0-scsi-0_0_0_0
[...]
root@ubuntu:~# udevadm test /sys/block/sde/
[...]
udev_device_update_db: created db file '/run/udev/data/b8:64' for
'/devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:04.0/ata3/host2/target2:0:0/2:0:0:0/block/sde'
ACTION=add
DEVLINKS=/dev/disk/by-id/ata-SAMSUNG_HD204UI_S2H7J90B804734
/dev/disk/by-id/scsi-SATA_SAMSUNG_HD204UIS2H7J90B804734
/dev/disk/by-id/wwn-0x50024e9205d4ea2f
/dev/disk/by-path/pci-0000:02:04.0-scsi-0:0:0:0 /dev/disk/zpool/v0d5
DEVNAME=/dev/sde
DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:04.0/ata3/host2/target2:0:0/2:0:0:0/block/sde
DEVTYPE=disk
[...]
ID_PATH=pci-0000:02:04.0-scsi-0:0:0:0
ID_PATH_TAG=pci-0000_02_04_0-scsi-0_0_0_0
[...]
** Affects: udev (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1166326
Title:
ID_PATH isn't set correctly for multiple devices
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