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Re: [Qemu-devel] [RFC PATCH 0/3] block: add support for 4k logical block
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From: |
Christoph Hellwig |
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Subject: |
Re: [Qemu-devel] [RFC PATCH 0/3] block: add support for 4k logical blocks |
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Date: |
Fri, 25 Nov 2011 12:13:10 +0100 |
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User-agent: |
Mutt/1.5.17 (2007-11-01) |
On Fri, Nov 25, 2011 at 09:27:43AM +0100, Paolo Bonzini wrote:
> No, it adds support for 512b logical block sizes running on a host with 4k
> logical block size and cache=none. This is suboptimal as it requires
> bounce buffers, but it can happen with migration and until libvirt provides
> a knob for the guest's logical block size.
It's also highly dangerous becausw the fs may assume a sector is written
atomically, but now it isn't. If at all I would recommend to only support
this case read only.