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[Bug 1859418] Re: disk driver with iothread setting hangs live migration
[Bug 1859418] Re: disk driver with iothread setting hangs live migrations
Fri, 17 Jan 2020 06:36:07 -0000
I will try the newest version as you suggest. However please note that
this is a redhat/centos 2.12 version which means it has a load of the
newest patches on it so probably closer to a 4-series than real 2.12...
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disk driver with iothread setting hangs live migrations
Status in QEMU:
Per report raised at
Description of problem:
A disk driver definition using iothread parameter causes live
migration with copy storage to hang during or just before the final
ram sync stage.
Interestingly, having the scsi controller as a separate iothread does
not trigger the issue.
Version-Release number of selected component (if applicable):
I can reproduce this on centos7 with qemu-ev and with centos 8:
Steps to Reproduce:
1. Create a definition with 1 iothread on the disk image:
<driver name='qemu' type='qcow2' iothread='1' />
2. Issue a live migrate request like: virsh migrate --live --copy-storage-all
3. Live migrate on source copies storage and then hangs at 80-99%, I guess
during the ram copy phase.
Keeping exactly the same config but without the iothread on the disk
driver has successful migrations every time.
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