err    error
	)
	switch op {
	case madmin.SiteResyncStart:
		status, err = globalSiteReplicationSys.startResync(ctx, objectAPI, peerSite)
	case madmin.SiteResyncCancel:
		status, err = globalSiteReplicationSys.cancelResync(ctx, objectAPI, peerSite)
	default:
		err = errSRInvalidRequest(errInvalidArgument)
	}
	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	}
	if len(buckets) != 0 && len(res.Buckets) == len(buckets) {
		return res, fmt.Errorf("all buckets resync failed")
	}
	return res, nil
}

// cancelResync stops an ongoing site level resync for the peer specified.
func (c *SiteReplicationSys) cancelResync(ctx context.Context, objAPI ObjectLayer, peer madmin.PeerInfo) (res madmin.SRResyncOpStatus, err error) {
	if !c.isEnabled() {
		return res, errSRNotEnabled
	}