Here is the full 'udevadm test' output for two disks on the same port
multiplier channel. I can do a disk on a different channel as well if
you want.
On 12.04, the sysfs path of the same disk slot is
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:00.0/host8/target8:0:0/8:0:0:0/block/sdk
(the sdN numbering is inconsistent from boot to boot, which is why we
want /dev/disk/by-path names for all of them). We don't have any 14.04
hosts with a port multiplier, so I don't know when the kernel started
putting the hostN directory in the /ataN/ directory and thus triggering
udev's special ATA disk handling.
('udevadm test /sys/class/block/sdk' on the 12.04 machine says that udev
sees this as an ATA and SATA disk; ID_ATA and ID_ATA_SATA are both 1 and
ID_BUS is ata. But it winds up with
ID_PATH=pci-0000:02:00.0-scsi-2:0:0:0, instead of an ata variant.)
I agree with your analysis that this is affects systemd HEAD. As far as
I can see HEAD has nothing in handle_scsi_ata() that would give
different names to multiple disks behind the same ATA port. Sadly we
have no systems that are running a recent enough systemd that I can
report it to them, based on their reporting policies. Is there a
bootable live CD of the in-progress next Ubuntu versions? That might
have a recent enough systemd that I could boot it on the system in
question, verify that its systemd isn't generating the right /dev/disk
/by-path results, and report it upstream.
** Attachment added: "full-out"
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1611945/+attachment/4719114/+files/full-out
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https://bugs.launchpad.net/bugs/1611945
Title:
/dev/disk/by-path not properly populated for (e)SATA port multiplier
disks
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