[PVE-User] NTFS/Windows Server corruption after successful livestorage migration

[Chris Murray]

Is it possible that a developer could comment on the mechanics of the online migration algorithm so that I know where to troubleshoot next?

 

I did create a rudimentary test in Debian which would write alternate patterns of data while I migrated VMs back and forth. Between each pattern it will test the file to verify that it contains everything it should. This all seems to work fine and the problem isn’t reproducible. Could the problem be OS-specific? I’m not a developer but I would guess that the migration algorithm would be lower-level than this?

 

Is it possible that the corruption could affect Windows machines while they’re under load and while they’re being migrated? It seems like it’s a factor of those three things. I don’t think it’s purely load as they do receive much higher load when e.g. at 03:00 all Windows virtual machines are subject to new updates. This doesn’t cause a problem; it only seems to be if I move a disk while it’s busy. Everything will tick along fine and the moment I have another corrupt VM I ask myself “what happened last?” and the answer is “I moved it” or “I changed file type”.

 

Any ideas?

 

Thanks,

Chris

 

From: pve-user [mailto:pve-user-bounces at pve.proxmox.com] On Behalf Of Chris Murray
Sent: 05 November 2014 22:34
To: Yannis Milios; pve-user at pve.proxmox.com
Subject: Re: [PVE-User] NTFS/Windows Server corruption after successful livestorage migration

 

Hi Yannis,

 

I can try that, but what is it expected that either result will prove?

 

If the VM is corrupt, what will that prove? What is the likely cause of the problem?

If the VM is not corrupt, what will that prove?

 

Thanks,

Chris

 

From: Yannis Milios [mailto:yannis.milios at gmail.com] 
Sent: 05 November 2014 20:44
To: pve-user at pve.proxmox.com; Chris Murray
Subject: Re: [PVE-User] NTFS/Windows Server corruption after successful live storage migration

 

hello,

Never tried online storage migration but what happens if you do the following:

1. create a windows vm in raw format, on local disk storage(not nfs mount).

2. Start installing updates on windows and initiate online storage migration to the nfs mount in qcow2 format.

Do you experience the same issue?

referance: https://pve.proxmox.com/wiki/Storage_Migration

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Version: 2015.0.5315 / Virus Database: 4189/8510 - Release Date: 11/04/14

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