increase virtio device limit

[dazigizad]

Hi,

I've been looking to attach a bunch of disks to a virtual machine. Since I'm attaching the raw disk, I have to use the command line. Unfortunately, it appears that the number of virtio disks is limited to 6 (0-5):
# qm set 102 -virtio6 /dev/sdg
Unknown option: virtio6
400 unable to parse option
qm set <vmid> [OPTIONS]

Using the help indicates that 6 is the limit. As expected, the GUI enforces this limit as well. The part that interests me is that if I look at the help in the Wiki (for the non-2.0 version), it says that it supports 16 virtio disks (0-15). See http://pve.proxmox.com/wiki/Qm_manual. I've been searching for a way to bump this limit, but have not been able to find anything. Is there a way to increase the limit in the 2.0 beta so that I can attach all of my disks?

Thanks,
Dj

 

[dietmar]

Is there a way to increase the limit in the 2.0 beta so that I can attach all of my disks?

No, currently not.

May I ask why you use so many disks?

 

[dazigizad]

This server runs a custom filesystem that stores large amounts of data. I was looking to move it off the physical server it is currently running on. There may be a way to try and get the host OS to run the custom filesystem, but a lot of diagnostics/alarms (as they are disk-level) would need to be moved there.

 

[ctm]

We use disk shelves, which hold 14 disks each as the repository for Disaster Recovery backups of our client's data. Each disk is seen by the OS as a seperate drive. By using seperate drives for each client we can, if need be, just pop the drive out and take it with us.
So a limit of 6 drives would mean we would need to split up that particular vm.
Any chance of getting the limit revised before 2.0 goes final?

regards
Craig

 

[dietmar]

Any chance of getting the limit revised before 2.0 goes final?

The needed patch (pve-to-pci bridge) is still not committed, sorry. But you can try to use different dist types (ide, scsi, virtio) to get up to 14 devices.

 

[ctm]

The needed patch (pve-to-pci bridge) is still not committed, sorry. But you can try to use different dist types (ide, scsi, virtio) to get up to 14 devices.

I wasn't aware of that, should work fine then.

Thanks