[pbs-devel] [PATCH proxmox-backup] proxmox-file-restore: allocate at least 256MB of RAM for the restore VM

[pbs-devel] [PATCH proxmox-backup] proxmox-file-restore: allocate at least 256MB of RAM for the restore VM

[Lukas Wagner]

The update from proxmox-backup-restore-image 0.7.0 -> 1.0.0 increased
the size of the initramfs image by couple of megabytes (~45 -> ~49),
making it too large to be successfully booted in a VM with 192MB of RAM.
This led to a "VM exited before connection could be established (500)"
error in the GUI when attempting to restore a single file,
while /var/log/proxmox-backup/file-restore/qemu.log reported the
following error:

  Initramfs unpacking failed: write error

As a stop-gap measure, the minimum RAM allocation is bumped to 256MB.

Since the amount of RAM is based on the number of disks, giving the VM
more memory if a large number of disks is associated with the backup
snapshot, this patch was also tested with 19, 20 and 25 disks as to
ensure that the remaining cases still work fine without a bump.

Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
---
 proxmox-file-restore/src/qemu_helper.rs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/proxmox-file-restore/src/qemu_helper.rs b/proxmox-file-restore/src/qemu_helper.rs
index e0e16911..4be9331c 100644
--- a/proxmox-file-restore/src/qemu_helper.rs
+++ b/proxmox-file-restore/src/qemu_helper.rs
@@ -316,7 +316,6 @@ pub async fn start_vm(
     } else {
         // add more RAM if many drives are given
         match id {
-            f if f < 10 => 192,
             f if f < 20 => 256,
             _ => 384,
         }
-- 
2.39.5



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[pbs-devel] applied: [PATCH proxmox-backup] proxmox-file-restore: allocate at least 256MB of RAM for the restore VM

[Thomas Lamprecht]

On Tue, 15 Jul 2025 12:19:07 +0200, Lukas Wagner wrote:
> The update from proxmox-backup-restore-image 0.7.0 -> 1.0.0 increased
> the size of the initramfs image by couple of megabytes (~45 -> ~49),
> making it too large to be successfully booted in a VM with 192MB of RAM.
> This led to a "VM exited before connection could be established (500)"
> error in the GUI when attempting to restore a single file,
> while /var/log/proxmox-backup/file-restore/qemu.log reported the
> following error:
> 
> [...]

Applied, thanks!

[1/1] proxmox-file-restore: allocate at least 256MB of RAM for the restore VM
      commit: 74d3d6e9da5a8e6c1abc05f3d3eb08d8c36eb8c5


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