Re: [Xen-API] [XCP 1.1 ISSUE] If SR gets stuck in a read only state nothing can be done with VMs.

[George Shuklin <george.shuklin@xxxxxxxxx>]

On 09.11.2012 04:20, Kigen wrote:
> Hi,
>
> Today we experienced an issue with our ReadyNAS which caused it to get
> stuck in a read-only state.  Unfortunately, it seems that our only
> solution is to backup the current contents of the NAS and format it.
> This takes a long time to do with the size of the NAS.  So we
> attempted to use XenCenter's Move, Copy or Export to get the VMs off
> the NAS that were critical.   Unfortunately, this fails as it appears
> that XCP always wants to modify the file regardless of the nature of
> the request.
>
> So I feel its appropriate to list this so that hopefully the next
> version of Xen can work with an SR that is stuck in a read only state.
>   Our simple goal was to copy the critical VMs down to local storage
> and begin working on them from there.
You asking to open Pandora's box. If NAS behaves strangely, the best XCP 
can do - do nothing. Because there is a bunch of issues can happens to 
storage, every one is escalated to XCP as one or other symptom. In some 
cases is better to continue to operate in R/O mode, in others is better 
to stop any operations as soon as possible, in third is better to replug 
PBD and so on.
If you want fast move some of VDI's, i think, manual VHD chain copy (to 
something like local ext3 SR) can helps.  But you need to know what you do.


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