From a9ad673244f051da8592408b0e888fdc62570f4e Mon Sep 17 00:00:00 2001
From: mprokopchuk <mprokopchuk@apple.com>
Date: Mon, 6 Jul 2026 12:11:47 -0700
Subject: [PATCH] Add debug logging when storage pool has insufficient IOPS
 capacity

---
 .../main/java/com/cloud/storage/StorageManagerImpl.java   | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/server/src/main/java/com/cloud/storage/StorageManagerImpl.java b/server/src/main/java/com/cloud/storage/StorageManagerImpl.java
index 2d170049663b..0b2aca08e084 100644
--- a/server/src/main/java/com/cloud/storage/StorageManagerImpl.java
+++ b/server/src/main/java/com/cloud/storage/StorageManagerImpl.java
@@ -3492,7 +3492,13 @@ protected boolean storagePoolHasEnoughIops(long requestedIops, List<Pair<Volume,
         long futureIops = currentIops + requestedIops;
         boolean hasEnoughIops = futureIops <= pool.getCapacityIops();
         String hasCapacity = hasEnoughIops ? "has" : "does not have";
-        logger.debug(String.format("Pool [%s] %s enough IOPS to allocate volumes [%s].", pool, hasCapacity, requestedVolumes));
+        StringBuilder stringBuilder = new StringBuilder();
+        stringBuilder.append(String.format("Pool [%s] %s enough IOPS to allocate volumes [%s]", pool, hasCapacity, requestedVolumes));
+        if (!hasEnoughIops) {
+            stringBuilder.append(String.format(" - Insufficient un-allocated IOPS for storage allocation: " +
+                    "capacityIops : %d, usedIops : %d, requestedIops : %d", pool.getCapacityIops(), currentIops, requestedIops));
+        }
+        logger.debug(stringBuilder.toString());
         return hasEnoughIops;
     }