21125: Updates S3 PrefixLength to 3, adding a warning note.

Arvados-DCO-1.1-Signed-off-by: Lucas Di Pentima <lucas.dipentima@curii.com>

diff --git a/tools/salt-install/config_examples/multi_host/aws/pillars/arvados.sls b/tools/salt-install/config_examples/multi_host/aws/pillars/arvados.sls
index 84df363c2e645c594e25378a7de3fe187dcb2069..af4734d12c680ceb1e918413f37e42c3dae2ee72 100644 (file)
--- a/tools/salt-install/config_examples/multi_host/aws/pillars/arvados.sls
+++ b/tools/salt-install/config_examples/multi_host/aws/pillars/arvados.sls
@@ -152,6 +152,11 @@ arvados:
           Bucket: __KEEP_AWS_S3_BUCKET__
           IAMRole: __KEEP_AWS_IAM_ROLE__
           Region: __KEEP_AWS_REGION__
+          # IMPORTANT: The default value for PrefixLength is 0, and should not
+          # be changed once the cluster is in use. For new installations it's
+          # recommended to set it to 3 for better performance.
+          # See: https://doc.arvados.org/install/configure-s3-object-storage.html
+          PrefixLength: 3
 
     Users:
       NewUsersAreActive: true