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+# Compute Service
+
+## Troubleshooting
+
+### Provisioning failure due to `downloading` volume
+
+If you're trying to provision a new instance that is using a volume where the
+backend needs to download images directly from Glance (such as PowerStore for
+example) and it fails with the following error:
+
+```
+Build of instance 54a41735-a4cb-4312-b812-52e4f3d8c500 aborted: Volume 728bdc40-fc22-4b65-b6b6-c94ee7f98ff0 did not finish being created even after we waited 187 seconds or 61 attempts. And its status is downloading.
+```
+
+This means that the volume service could not download the image before the
+compute service timed out.  Out of the box, Atmosphere ships with the volume
+cache enabled to help offset this issue.  However, if you're using a backend
+that does not support the volume cache, you can increase the timeout by setting
+the following in your `inventory/group_vars/all/nova.yml` file:
+
+```yaml
+nova_helm_values:
+  conf:
+    enable_iscsi: true
+    nova:
+      DEFAULT:
+        block_device_allocate_retries: 300
+```