** Package changed: debian-installer (Ubuntu) = multipath-tools
(Ubuntu)
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https://bugs.launchpad.net/bugs/1429327
Title:
ISST-LTE: system drops to initramfs
** Package changed: debian-installer (Ubuntu) = multipath-tools
(Ubuntu)
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Title:
ISST-LTE: system drops to initramfs after install on multipath
The test-cases performed with the patch:
Install the modified multipath-tools' binary packages; the initramfs is
updated with the changes.
Reboot. The system booted successfully; good.
Notice:
- unmodified kernel cmdline
- root filesystem mounted from the 'by-uuid/multipath-UUID' symlink
- it
Hi Mathieu and Steve,
Sorry for the delay on this.
Here's the patch addressing most of Steve's directions (comment #13).
I'll submit the remaining changes shortly.
Patch description:
- multipath-tools should (if it doesn't already) create a symlink for the
device which includes the UUID,
The attachment multipath-tools_root-uuid-multipath.debdiff seems to be
a debdiff. The ubuntu-sponsors team has been subscribed to the bug
report so that they can review and hopefully sponsor the debdiff. If
the attachment isn't a patch, please remove the patch flag from the
attachment, remove
Back to Steve's point (which now I understand more clearly, and looks
totally right..) of event-driven multipath assembly.
- multipath-tools should (if it doesn't already) create a symlink for the
device which includes the UUID,
but is only ever created once multipath is initialized
- the
BTW, the event-driven multipath assembly can now work again, with the
patch in bug 1431650.
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Title:
ISST-LTE: system drops to initramfs after
Possibly good news.
See bug 1431650 comment 10.
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Title:
ISST-LTE: system drops to initramfs after install on multipath disk
To manage
There may be another (simpler) way here, that is to use the wait-for-
root or the failure hooks called in pre_mountroot() (local/mount).
This should be combined w/ vorlon's catch of using a different UUID
symlink for a multipath device, that should be changed on /etc/fstab /
kernel cmdline, so we
Hi Steve,
Given that we *know* that the UUID is not unique in the multipath scenario,
and know this at install time, I think it's wrong for us to configure the
system
to reference filesystems via this non-unique identifier.
I see your point.
Although, I'm not sure it's technically
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
Constraints:
1) Can't count on udev rules to run 'multipath' (see bug 1431650)
Ideas:
0) sleep when there's no scsi_wait_scan module. (below)
1) make sure related SCSI modules are loaded before scsi_complete_async_scans()
(drivers/scsi/scsi_scan.c) is called.
2) loop waiting for the number of
And illustrating the previous point (root filesystem on single-path
device):
(initramfs) cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinux-3.19.0-8-generic
root=UUID=3809b2f8-dcb0-4a6a-945a-885e384b463e ro break=post-multipath
(initramfs) ls -l /dev/disk/by-uuid
...
Architecturally speaking, I think it's a bug that installing to
multipath results in the boot config pointing to a UUID for the root
device. In all other cases, we use identifiers for all filesystems
(root or otherwise) which are guaranteed to be both stable and unique.
(For LVM, this is the LV
** Changed in: debian-installer (Ubuntu)
Assignee: Taco Screen team (taco-screen-team) = Mathieu Trudel-Lapierre
(mathieu-tl)
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Title:
Nice comment on a lvm-devel thread:
The removal of scsi_wait_scan doesn't actually mean any of the bus scans are
done when you wait on systemd-udev-settle, so making that change won't
really solve the issue you need. If I'm understanding it right, I think
in a world without scsi-wait-scan,
FYI
This problem becomes more evident/likely if the fix/work-around for bug
1431650 is applied (i.e., no udev time-out for multipath devices).
It seems that the time-out that arises from that bug gives the SCSI scan
time to complete, and by the time the last 'multipath' command runs
This seems to have something to do with hardware, or delay between 2 multipath
commands.
Still checking.
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Title:
ISST-LTE: system drops to
Please don't care about this for now.
I'll get more time on it tomorrow.
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Title:
ISST-LTE: system drops to initramfs after install on multipath
** Changed in: debian-installer (Ubuntu)
Status: New = Confirmed
** Changed in: debian-installer (Ubuntu)
Assignee: (unassigned) = Taco Screen team (taco-screen-team)
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** Tags removed: targetmilestone-inin---
** Tags added: targetmilestone-inin1504
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Title:
ISST-LTE: system drops to initramfs after install on
** Package changed: ubuntu = debian-installer (Ubuntu)
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Title:
ISST-LTE: system drops to initramfs after install on multipath disk
To manage
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