Add pool PGs count modification

Allows an administrator to adjust the PG count of a given pool. This can
be used to increase the PGs (for example after adding more OSDs) or
decrease it (to remove OSDs, reduce CPU load, etc.).

client-cli/pvc/cli_lib/ceph.py

@@ -708,7 +708,7 @@ def ceph_pool_info(config, pool):
 
 def ceph_pool_list(config, limit):
     """
-    Get list information about Ceph OSDs (limited by {limit})
+    Get list information about Ceph pools (limited by {limit})
 
     API endpoint: GET /api/v1/storage/ceph/pool
     API arguments: limit={limit}
@@ -728,7 +728,7 @@ def ceph_pool_list(config, limit):
 
 def ceph_pool_add(config, pool, pgs, replcfg, tier):
     """
-    Add new Ceph OSD
+    Add new Ceph pool
 
     API endpoint: POST /api/v1/storage/ceph/pool
     API arguments: pool={pool}, pgs={pgs}, replcfg={replcfg}, tier={tier}
@@ -747,7 +747,7 @@ def ceph_pool_add(config, pool, pgs, replcfg, tier):
 
 def ceph_pool_remove(config, pool):
     """
-    Remove Ceph OSD
+    Remove Ceph pool
 
     API endpoint: DELETE /api/v1/storage/ceph/pool/{pool}
     API arguments:
@@ -766,6 +766,27 @@ def ceph_pool_remove(config, pool):
     return retstatus, response.json().get("message", "")
 
 
+def ceph_pool_set_pgs(config, pool, pgs):
+    """
+    Set the PGs of a Ceph pool
+
+    API endpoint: PUT /api/v1/storage/ceph/pool/{pool}
+    API arguments: {"pgs": "{pgs}"}
+    API schema: {"message":"{data}"}
+    """
+    params = {"pgs": pgs}
+    response = call_api(
+        config, "put", "/storage/ceph/pool/{pool}".format(pool=pool), params=params
+    )
+
+    if response.status_code == 200:
+        retstatus = True
+    else:
+        retstatus = False
+
+    return retstatus, response.json().get("message", "")
+
+
 def format_list_pool(pool_list):
     # Handle empty list
     if not pool_list:

client-cli/pvc/pvc.py

@@ -3532,6 +3532,8 @@ def ceph_pool():
 def ceph_pool_add(name, pgs, tier, replcfg):
     """
     Add a new Ceph RBD pool with name NAME and PGS placement groups.
+
+    The placement group count must be a non-zero power of 2.
     """
 
     retcode, retmsg = pvc_ceph.ceph_pool_add(config, name, pgs, replcfg, tier)
@@ -3570,6 +3572,26 @@ def ceph_pool_remove(name, confirm_flag):
     cleanup(retcode, retmsg)
 
 
+###############################################################################
+# pvc storage pool set-pgs
+###############################################################################
+@click.command(name="set-pgs", short_help="Set PGs of an RBD pool.")
+@click.argument("name")
+@click.argument("pgs")
+@cluster_req
+def ceph_pool_set_pgs(name, pgs):
+    """
+    Set the placement groups (PGs) count for the pool NAME to PGS.
+
+    The placement group count must be a non-zero power of 2.
+
+    Placement group counts may be increased or decreased as required though frequent alteration is not recommended.
+    """
+
+    retcode, retmsg = pvc_ceph.ceph_pool_set_pgs(config, name, pgs)
+    cleanup(retcode, retmsg)
+
+
 ###############################################################################
 # pvc storage pool list
 ###############################################################################
@@ -5844,6 +5866,7 @@ ceph_osd.add_command(ceph_osd_list)
 
 ceph_pool.add_command(ceph_pool_add)
 ceph_pool.add_command(ceph_pool_remove)
+ceph_pool.add_command(ceph_pool_set_pgs)
 ceph_pool.add_command(ceph_pool_list)
 
 ceph_volume.add_command(ceph_volume_add)