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Description of problem:
I have a setup with iscsi multipathed device as a underlying block device for vdo. After reboot however vdo.service is started before this device exists resulting in unavailable vdo device. vdo.service should not start until iscsi have started if vdo underlying device is multipath + iscsi (multipath starts before iscsi).
Version-Release number of selected component (if applicable):
vdo-6.1.1.125-3.el7.x86_64
How reproducible: always
Steps to Reproduce:
1. configure vdo on top of multipath iscsi block device
2. reboot system
Actual results: vdo device not available after reboot
Expected results: vdo device started after reboot
Additional info:
This issue can be worked around by overriding vdo.service requirements:
https://github.com/dm-vdo/vdo/issues/9#issuecomment-452644976
Updating the title to emphasize that this is when using an iscsi backing device.
Here's the text from the github issue, relevant to systemd sequencing:
(default settings)
"multipathd.service" says "After=iscsi.service"
"iscsi.service" says "Before=remote-fs-pre.target"
(modification made to allow the VDO volume to start automatically)
$ cat /etc/systemd/system/vdo.service.d/override.conf`
[Unit]
After=remote-fs-pre.target multipathd.service