[sheepdog-users] Vdi corruption with erasure code if n nodes < x

[Micha Kersloot]

Hi Andrew,

thank you for your answer. So it seems that using 3 nodes and using copies=2:1 is not really stable at the moment? Do you think copies=3 with 3 nodes is allright, or should I really need to fetch an extra node to get things stable?

Met vriendelijke groet,

Micha Kersloot

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----- Original Message -----
> From: "Andrew J. Hobbs" <ajhobbs at desu.edu>
> To: sheepdog-users at lists.wpkg.org
> Sent: Thursday, October 9, 2014 3:48:06 PM
> Subject: Re: [sheepdog-users] Vdi corruption with erasure code if n nodes < x
> 
> Likely.  In production, we have 8 servers and use copies=3.  Generally,
> we have not experienced corruption.  I suspect there are some corner
> cases when you drop below the minimum copies number where the recovery
> fails. Certainly we know there are a couple of issues in recovery in
> regards to erasure encoding to be fixed.
> 
> On 10/09/2014 06:05 AM, Micha Kersloot wrote:
> > Hi,
> >
> > ----- Original Message -----
> >> From: "Valerio Pachera" <sirio81 at gmail.com>
> >> To: "Lista sheepdog user" <sheepdog-users at lists.wpkg.org>
> >> Sent: Tuesday, October 7, 2014 5:06:23 PM
> >> Subject: Re: [sheepdog-users] Vdi corruption with erasure code if n nodes
> >> < x
> >>
> >> 2014-10-07 15:32 GMT+02:00 Hitoshi Mitake <mitake.hitoshi at gmail.com>:
> >>> It doesn't works because of some bugs.
> >>> I'll fix it so halting cluster or freezing VDIs wouldn't be required.
> >>> # I'm on a business trip to U.S. so my reply and development is delaying,
> >>> sorry
> >> Thank for the update.
> > would this explain the problems I have as f.e.:
> >   10.4 % [=========>
> >   ]
> >   10 GB / 100 GB     object cb7f6400000a6b is inconsistent
> >
> > while I'm testing some failure scenarios? Somehow I seems very easy for me
> > to end with corrupted vdi's.
> >
> > Met vriendelijke groet,
> >
> > Micha Kersloot
> 
> 
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