I'm testing adding 255 disks to a RHEL VMS.
Test failed, after attaching 255 disk's only 243 disk got attached.

At the VMI saw the following error : 

message: 'unknown error encountered sending command SyncVMI: rpc error: code =
   DeadlineExceeded desc = context deadline exceeded'
  reason: Synchronizing with the Domain failed.
  status: "False"
  type: Synchronized

At the virt-launcher saw the following error :

{"component":"virt-launcher","kind":"","level":"info","msg":"Synced vmi","name":"rhel9-server","namespace":"default","pos":"server.go:191","timestamp":"2023-08-06T13:33:53.871900Z","uid":"73d0b14f-82ad-4805-aa1f-1828bbce1358"} {"component":"virt-launcher","level":"error","msg":"No disk capacity","pos":"manager.go:684","timestamp":"2023-08-06T13:33:54.158966Z"}

 

Tested scenario details

Test the following scenario :

• Install 6 nodes cluster with OCS block storage
• Create and start a rhel 9 server VM.
• Create and attach 255 PVC’s : 
• Volume mode : block
• Access modes : RWX
• Capacity : 1 GiB
• Persistent Hotplug (--persist)
• Interface : SCSI