To illustrate the problem more clearly:
> The 'multipath' command is run *before* the disks over FC show up.
> It must wait for them to settle.
> There's a wait for SCSI devices already, but it is not enough in this case.
(it actually doesn't work because scsi_wait_scan was removed from the kernel
years ago.)
...
Loading, please wait...
starting version 219
...
Begin: Running /scripts/local-top ...
Begin: Loading multipath modules ...
...
Begin: Waiting for scsi storage ... done.
Begin: Discovering multipaths ...
...
[ 4.088476] scsi host2: Emulex LPe12000 PCIe Fibre Channel Adapter
on PCI bus 50 device 01 irq 506
...
[ 7.472269] scsi 2:0:0:1: Direct-Access IBM 2810XIV
10.2 PQ: 0 ANSI: 5
[ 7.473301] sd 2:0:0:1: Attached scsi generic sg2 type 0
[ 7.473542] sd 2:0:0:1: [sdb] 67108864 512-byte logical blocks:
(34.3 GB/32.0 GiB)
...
In this example, sdb is not considered by the multipath command
(Discovering multipaths ...).
Another problem arising from this: a root filesystem that should be
mounted on a multipath device is actually mounted on one of its single-
path devices.
Explanation: the root filesystem is specified by-UUID (root=UUID=...), and the
/dev/disk/by-uuid symlink will point to the last detected single-path device w/
the matching UUID.
Had the disks been detected before the multipath command ran, the symlink would
be updated to point to the multipath device (higher link priority, in kpartx
udev rules).
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https://bugs.launchpad.net/bugs/1429327
Title:
ISST-LTE: system drops to initramfs after install on multipath disk
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