[jira] [Commented] (CLOUDSTACK-1302) Add per storage setting for cache="none/writeback/writethrough" options for VMs on KVM hypervisor

["Enzo Bettini (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-1302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15438845#comment-15438845 ] 

Enzo Bettini commented on CLOUDSTACK-1302:
------------------------------------------

Hi, 

This issue is still in 4.8.0, and according to another person on the user list, its not working in 4.7.1 either.
However, someone did test it on 4.5.1 to be working.

Has this not been brought forward to the newer versions?

> Add per storage setting for cache="none/writeback/writethrough" options for VMs on KVM hypervisor
> -------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-1302
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-1302
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Management Server
>    Affects Versions: 4.0.0
>         Environment: Ubuntu 12.04.2 Host, KVM hypervisor
>            Reporter: Jason Villalta
>            Assignee: Wido den Hollander
>            Priority: Minor
>             Fix For: 4.4.0, 4.5.0
>
>
> Version 4.0.0 of Cloudstack has a hard coded value of cache=none for virtual machines deployed.  This causes conflict with filesystems mounted with fuse such as ZFS, GlusterFs and CEPH as fuse does not support directio with these file systems.  When starting VMs libvirt throws an error "could not open disk image <disk> Invalid argument"
> Changing the cache= setting to writethough or writeback solves this problem but there currently is no way to set this.  Ideally this would get set on a per datastore basis.



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