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Re: [Qemu-devel] [PATCH] mirror: prevent 'top' mode mirroring when no ba
From: |
sochin.jiang |
Subject: |
Re: [Qemu-devel] [PATCH] mirror: prevent 'top' mode mirroring when no backing file specified on the destination |
Date: |
Tue, 20 Dec 2016 08:41:14 +0800 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 |
Well, that makes sense, I lose my consideration, thanks.
Sochin Jiang
On 2016/12/19 23:31, Eric Blake wrote:
> On 12/19/2016 04:38 PM, sochin jiang wrote:
>> Mirroring using 'top' mode without backing file specified on the target can
>> be success,
>> but end with a disaster.
>>
>> For example:
>> Migration can be success in this situation while the virtual machine on
>> the destination
>> is no longer usable because of backing lost.
>>
>
> I think this is a premature policy decision. Even though the user can
> abuse it to lose data, I think there is still enough technical reason
> for why a user might have a valid use case for doing this (perhaps for
> creating incremental backups, where the user plans on re-chaining data
> back together using 'qemu-img rebase -u'), so I don't think we should
> forbid it at the qemu level.
>