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Solution for: Proxmox backup error due to iothread=1 – A changelog by Daniel Mettler
Posted on by Daniel Mettler

Solution for: Proxmox backup error due to iothread=1

If you see the following error when trying to backup a KVM VM image on Proxmox:

ERROR: Backup of VM 100 failed – disk ‘scsi0’ ‘zfsvols:vm-100-disk-1’ (iothread=on) can’t use backup feature currently. Please set backup=no for this drive at /usr/share/perl5/PVE/VZDump/QemuServer.pm line 77. INFO: Backup job finished with errors TASK ERROR: job errors

edit /etc/pve/qemu-server/100.conf, look for a line similar to

scsi0: zfsvols:vm-100-disk-1,iothread=1,size=70G

and change it to

scsi0: zfsvols:vm-100-disk-1,iothread=0,size=70G

Afterwards, it’s possible to backup the VM.

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Notice: fwrite(): Write of 1126 bytes failed with errno=28 No space left on device in /var/www/news.numlock.ch/public_html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php on line 42

Fatal error: Uncaught wfWAFStorageFileException: Unable to verify temporary file contents for atomic writing. in /var/www/news.numlock.ch/public_html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php:51 Stack trace: #0 /var/www/news.numlock.ch/public_html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php(658): wfWAFStorageFile::atomicFilePutContents() #1 [internal function]: wfWAFStorageFile->saveConfig() #2 {main} thrown in /var/www/news.numlock.ch/public_html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php on line 51