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From "Aleksandr (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-1302) Add per storage setting for cache="none/writeback/writethrough" options for VMs on KVM hypervisor
Date Sun, 10 May 2015 20:49:00 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-1302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537364#comment-14537364
] 

Aleksandr commented on CLOUDSTACK-1302:
---------------------------------------

Im confused, there are 3 small problems actually ? Cant set via GUI, not passed to agent(qemu)
and doesnt apply by agent to new attached disk ? )

> 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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