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.
2022-12-05 17:56:59 -05:00
parent 35f5219916
commit f076554b15
1 changed files with 1 additions and 1 deletions
--- 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}'/>