From 6d7730ab525ac18662ff7b7cdaf41456610713bd Mon Sep 17 00:00:00 2001
From: "Joshua M. Boniface" <joshua@boniface.me>
Date: Mon, 5 Dec 2022 17:56:59 -0500
Subject: [PATCH] Disable RBD caching by default

Results in a massive (~2x) performance boost for random block I/O inside
VMs, and thus a worthwhile default change.
---
 api-daemon/pvcapid/libvirt_schema.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/api-daemon/pvcapid/libvirt_schema.py b/api-daemon/pvcapid/libvirt_schema.py
index 1ad496af..38929112 100755
--- a/api-daemon/pvcapid/libvirt_schema.py
+++ b/api-daemon/pvcapid/libvirt_schema.py
@@ -100,7 +100,7 @@ devices_scsi_controller = """    <controller type='scsi' index='0' model='virtio
 #  * vm_name
 #  * disk_id
 devices_disk_header = """    <disk type='network' device='disk'>
-      <driver name='qemu' discard='unmap'/>
+      <driver name='qemu' discard='unmap' cache='none'/>
       <target dev='{disk_id}' bus='scsi'/>
       <auth username='libvirt'>
         <secret type='ceph' uuid='{ceph_storage_secret}'/>