openstack
/
ironic-python-agent
Code Issues Proposed changes

Software RAID: Call udev_settle before creation 

This patch fixes a race during software RAID creation:
we create the partition with parted, the kernel then
notifies udev, but we need to wait for udevd to create
the device files before calling mdadm to create the
md device.

Credits to jcosmao for finding this.

Change-Id: I642f28acc351cf50263e37dfbc8468bf59de2cc5
(cherry picked from commit 9d707e9f4b)
This commit is contained in:
Arne Wiebalck 2021-10-04 16:57:56 +02:00 committed by Julia Kreger
parent c3ad0e6a58
commit 60a51252f4
2 changed files with 14 additions and 0 deletions
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7
ironic_python_agent/hardware.py
View File

@ -2029,6 +2029,13 @@ class GenericHardwareManager(HardwareManager):
utils.execute('parted', device, '-s', '-a',
'optimal', '--', 'mkpart', 'primary',
start_str, end_str)
# Parted/udev partition creation is asynchronous.
# Wait for udev events to be processed before going to
# next step. This avoids getting errors at mdadm
# create because a device is not ready yet.
_udev_settle()
# Necessary, if we want to avoid hitting
# an error when creating the mdadm array below
# 'mdadm: cannot open /dev/nvme1n1p1: No such file

7
releasenotes/notes/fix-nvme-software-raid-race-2e0e104de9611228.yaml Normal file
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@ -0,0 +1,7 @@
---
fixes:
- |
Fixes a race on software RAID creation: since the creation of
partitions is asynchronous, we need to wait for all udev events
to be processed before we can use the partitions to create an
md device.