[Bug 1526984] [NEW] ISST-LTE: root mpath device unavailable after installation

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Canonical FYI:

We appear to have a regression in the current 14.04 environment back to
the behavior originally outlined in Comment #10 of LP Bug 1429327.

---Problem---

A multipath install of 14.04.04 fails to create the install mpath
device on subsequent boots.  While the root filesystem ends up being
mounted on top of one of the path devices, other partitions on that
multipath device will not be automatically found.

---Additional details---

For one example host, the install disk was set up with a root and
swap partition:

Dec 14 21:37:55 disk-detect: create: mpath0 (35000c5007655a10f) undef IBM     ,ST300MP0064
Dec 14 21:37:55 disk-detect: size=279G features='0' hwhandler='0' wp=undef
Dec 14 21:37:55 disk-detect: |-+- policy='round-robin 0' prio=1 status=undef
Dec 14 21:37:55 disk-detect: | `- 0:0:7:0 sdc 8:32 undef ready running
Dec 14 21:37:55 disk-detect: `-+- policy='round-robin 0' prio=1 status=undef
Dec 14 21:37:55 disk-detect:   `- 1:0:3:0 sdd 8:48 undef ready running

The resulting fstab entries after install were:

/dev/mapper/mpath0-part2 /               ext4    errors=remount-ro 0 1
/dev/mapper/mpath0-part3 none            swap    sw                0 0

In post-install boots, the multipath command appears to be executed
prior to any disks being discovered:

Begin: Loading essential drivers ... done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... [    0.612955] ipr: IBM Power RAID SCSI Device Driver version: 2.6.1 (March 12, 2015)
[    0.612985] ipr 0000:80:00.0: Found IOA with IRQ: 0
[    0.613478] ipr 0000:80:00.0: ibm,query-pe-dma-windows(53) 800000 8000000 20000164 returned 0
Begin: Running /scripts/local-top ... [    0.613727] ipr 0000:80:00.0: ibm,create-pe-dma-window(54) 800000 8000000 20000164 10 21 returned 0 (liobn = 0x70000164 starting addr = 8000000 0)
Begin: Loading multipath modules ... [    0.618790] device-mapper: multipath: version 1.9.0 loaded
Success: loaded module dm-multipath.
Failure: failed to load module dm-emc.
done.
Begin: Waiting for scsi storage ... done.
Begin: Discovering multipaths ... [    0.623429] be2net 0002:01:00.0: be2net version is 10.6.0.2
[    0.623587] be2net 0002:01:00.0: enabling device (0000 -> 0002)
done.
[    0.636785] ipr 0000:80:00.0: Using 64-bit direct DMA at offset 800000000000000
[    0.637343] be2net 0002:01:00.0: PCIe error reporting enabled
[    0.641435] ipr 0000:80:00.0: Received IRQ : 20
[    0.641522] ipr 0000:80:00.0: Request for 2 MSIXs succeeded.
[    0.645713] ipr 0000:80:00.0: Starting IOA initialization sequence.
[    0.645719] scsi host0: IBM 0 Storage Adapter
[    0.645741] ipr 0000:80:00.0: Starting IOA initialization sequence.
[    0.645833] ipr 0001:a0:00.0: Found IOA with IRQ: 0
[    0.646221] ipr 0000:80:00.0: Adapter firmware version: 13510C00
[    0.647673] ipr 0000:80:00.0: IOA initialized.
[    0.648009] ipr 0001:a0:00.0: Received IRQ : 448
[    0.648041] ipr 0001:a0:00.0: Request for 2 MSIXs succeeded.
[    0.651764] ipr 0001:a0:00.0: Starting IOA initialization sequence.
[    0.651769] scsi host1: IBM 0 Storage Adapter
[    0.651795] ipr 0001:a0:00.0: Starting IOA initialization sequence.
[    0.652262] ipr 0001:a0:00.0: Adapter firmware version: 13510C00
[    0.653702] ipr 0001:a0:00.0: IOA initialized.
[    0.660800] scsi 0:3:0:0: No Device         IBM      57B1001SISIOA    0150 PQ: 0 ANSI: 0
[    0.660811] scsi 0:3:0:0: Resource path: 0/FE
[    0.672518] scsi 0:0:0:0: Direct-Access     IBM      ST300MP0064      7D0E PQ: 0 ANSI: 6
[    0.672530] scsi 0:0:0:0: Resource path: 0/00-0E-08
...
(first device in mpath0 seen at this point):
[    0.710988] scsi 1:0:3:0: Direct-Access     IBM      ST300MP0064      7D0E PQ
: 0 ANSI: 6
[    0.710994] scsi 1:0:3:0: Resource path: 1/00-0E-0A

The system ends up mounting the root filesystem from /dev/sdc2,
and the post-mount run of multipath errors out creating mpath0:

[   10.056286] device-mapper: table: 252:0: multipath: error getting device
[   10.082644] device-mapper: table: 252:0: multipath: error getting device
[   10.192614] device-mapper: table: 252:2: multipath: error getting device
[   10.222609] device-mapper: table: 252:2: multipath: error getting device
[   10.663458] device-mapper: table: 252:2: multipath: error getting device
[   10.682690] device-mapper: table: 252:2: multipath: error getting device
[   10.796743] device-mapper: table: 252:2: multipath: error getting device

Since no other filesystems depend on mpath0 for this example config,
the system is able to boot, but lacks swap due to the missing swap
device.

** Affects: multipath-tools (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le targetmilestone-inin14044
-- 
ISST-LTE: root mpath device unavailable after installation
https://bugs.launchpad.net/bugs/1526984
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