defer b.plugin.targetLocks.UnlockKey(b.Iqn)

	// Build a map of SCSI hosts for each target portal. We will need this to
	// issue the bus rescans.
	portalHostMap, err := b.deviceUtil.GetISCSIPortalHostMapForTarget(b.Iqn)
	if err != nil {
		return "", err
	}
	klog.V(4).Infof("AttachDisk portal->host map for %s is %v", b.Iqn, portalHostMap)

	for i := 1; i <= maxAttachAttempts; i++ {