/// <summary>
/// Try to forget an SR that has previously failed to completely plug. Nothrow guarantee.
/// </summary>
private void ForgetFailedSR(XenRef <SR> sr)
{
try
{
foreach (XenRef <PBD> pbd in XenAPI.SR.get_PBDs(Session, sr.opaque_ref))
{
if (PBD.get_currently_attached(Session, pbd))
{
PBD.unplug(Session, pbd);
}
}
XenAPI.SR.forget(Session, sr.opaque_ref);
}
catch
{
log.Debug("SR.forget() failed! Continuing anyway");
}
}
/// <summary>
/// Disable clustering on the host (if the network is used by clustering), before changing the management interface;
/// Before disabling clustering we also unplug all the GFS2 SRs
/// </summary>
private void DisableClustering(PIF pif, out List <PBD> gfs2Pbds)
{
gfs2Pbds = new List <PBD>();
var isUsedByClustering = Connection.Cache.Clusters.Any(cluster => cluster.network.opaque_ref == pif.network.opaque_ref);
if (!isUsedByClustering)
{
return;
}
var host = Connection.Resolve(pif.host);
if (host == null)
{
return;
}
var clusterHost = Connection.Cache.Cluster_hosts.FirstOrDefault(c => c.host.opaque_ref == host.opaque_ref);
if (clusterHost == null)
{
return;
}
// unplug the GFS2 SRs, saving the list of the PBDs unplugged, to plug back later
foreach (var pbd in Connection.ResolveAll(host.PBDs).Where(pbd => pbd.currently_attached))
{
var sr = Connection.Resolve(pbd.SR);
if (sr != null && sr.GetSRType(true) == SR.SRTypes.gfs2)
{
gfs2Pbds.Add(pbd);
Description = string.Format(Messages.ACTION_SR_DETACHING, sr.Name(), host.Name());
PBD.unplug(Session, pbd.opaque_ref);
}
}
// disable clustering
Description = string.Format(Messages.DISABLING_CLUSTERING_ON_POOL, host.Name());
log.Debug(Description);
Cluster_host.disable(Session, clusterHost.opaque_ref);
}
protected override void Run()
{
Exception unplugException = null;
// Only unplug and replug already plugged pbds
List <String> pluggedPBDrefs = new List <String>();
try
{
foreach (PBD pbd in host.Connection.ResolveAll(host.PBDs))
{
if (!pbd.currently_attached)
{
continue;
}
pluggedPBDrefs.Add(pbd.opaque_ref);
PBD.unplug(Session, pbd.opaque_ref);
}
// CA-19392: Multipath enablement / disablement
if (Helpers.KolkataOrGreater(host))
{
Host.set_multipathing(Session, host.opaque_ref, multipath);
}
else
{
Host.remove_from_other_config(Session, host.opaque_ref, Host.MULTIPATH);
Host.add_to_other_config(Session, host.opaque_ref, Host.MULTIPATH, multipath.ToString().ToLowerInvariant());
}
Host.remove_from_other_config(Session, host.opaque_ref, Host.MULTIPATH_HANDLE);
if (multipath)
{
Host.add_to_other_config(Session, host.opaque_ref, Host.MULTIPATH_HANDLE, DEFAULT_MULTIPATH_HANDLE);
}
}
catch (Exception e)
{
unplugException = e;
log.Debug("Error occurred unplugging pbds", e);
throw;
}
finally
{
Exception plugException = null;
foreach (String pbdRef in pluggedPBDrefs)
{
try
{
PBD.plug(Session, pbdRef);
}
catch (Exception e)
{
if (unplugException == null && plugException == null)
{
plugException = e;
}
log.Debug("Error occurred replugging pbds", e);
}
}
// Only throw a plug exception if there we no unplug exceptions
if (unplugException == null && plugException != null)
{
throw plugException;
}
}
}