[sheepdog-users] Very bad write performances with qemu driver (qemu-img convert)

[Hitoshi Mitake]

At Fri, 29 May 2015 17:11:59 +0200 (CEST),
Walid Moghrabi wrote:
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> Hi, 
> 
> I have a very strange behaviour with my setup. 
> When I'm converting images from local to sheepdog for example with qemu-img convert, writing to sheepdog is very very slow (about 2-3MB/s) however, when I write directly to Sheepdog through dog vdi read, it works with good performances (more than 100MB/s). 
> 
> I'm pretty annoyed with this because it makes my life a bit mre complicated when I want to migrate volumes between storages or restore backups from ProxMox (which uses qemu-img for that) as it is extremely slow. 
> 
> Read/Write performances are good from within the VMs on the other hand ... 
> 
> This is pretty weird and I don't know where it fails. 
> 
> Any help mostly welcomed. 

Hmm, could you add an issue to our tracker?
https://launchpad.net/sheepdog-project

I don't have a time for solving the problem now, sorry.

Thanks,
Hitoshi

> 
> Regards, 
> 
> Walid 
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