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

["Jason Villalta (JIRA)" <ji...@apache.org>]

Jason Villalta created CLOUDSTACK-1302:
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             Summary: 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
            Priority: Minor


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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