[zfs-discuss] ZFS and Power Loss

Adam Boyhan via zfs-discuss zfs-discuss at list.zfsonlinux.org
Wed May 6 09:28:13 EDT 2015

That is definitely a possibility. Never even dawned on me. Definitely looks like it is not supported. 


From: "Markus Koeberl" <markus.koeberl at tugraz.at> 
To: "zfs-discuss" <zfs-discuss at list.zfsonlinux.org> 
Cc: "adamb" <adamb at medent.com> 
Sent: Wednesday, May 6, 2015 9:23:23 AM 
Subject: Re: [zfs-discuss] ZFS and Power Loss 

On Tuesday 05 May 2015 18:59:34 Adam Boyhan via zfs-discuss wrote: 
> I should have also mentioned that I have yet to test the new program with O_SYNC in the physical environment. I have only tested it in the virtual environment. I am using proxmox/KVM as the virtual environment and have the virtual disks set to "directsync". 

from https://pve.proxmox.com/wiki/Performance_Tweaks: 

This mode causes qemu-kvm to interact with the disk image file or block device with both O_DSYNC and O_DIRECT semantics 

Maybe the problem is that ZFS does not support O_DIRECT as far I know? 

Markus Köberl 
Markus Koeberl 
Graz University of Technology 
Signal Processing and Speech Communication Laboratory 
E-mail: markus.koeberl at tugraz.at 
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