mon/OSDMonitor: be more helpful for new weight-set CLI users

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>

diff --git a/src/mon/OSDMonitor.cc b/src/mon/OSDMonitor.cc
index 7eb5c05b14adef96a534963667721a88f2dbf0e2..b58e0aec06b5af03d17d6b785f2c80a333c652a7 100644 (file)
--- a/src/mon/OSDMonitor.cc
+++ b/src/mon/OSDMonitor.cc
@@ -7688,7 +7688,9 @@ bool OSDMonitor::prepare_command_impl(MonOpRequestRef op,
          osdmap.require_min_compat_client < CEPH_RELEASE_LUMINOUS) {
        ss << "require_min_compat_client "
           << ceph_release_name(osdmap.require_min_compat_client)
-          << " < luminous, which is required for per-pool weight-sets";
+          << " < luminous, which is required for per-pool weight-sets. "
+           << "Try 'ceph osd set-require-min-compat-client luminous' "
+           << "before using the new interface";
        err = -EPERM;
        goto reply;
       }