[Xen-API] XCP suspend and resume from SR problem

[Tomoiaga Cristian <cristi@xxxxxxxxxxx>]

Hello everyone,

I hit the wall here and I have given up on this issue that I have but maybe 
someone can still show me something that I may have missed.
I created a SR for Nexenta and Solaris and I wanted to test the suspend/resume 
functionality with a dedicated SR just for that. 

My problem in short is that when I suspend a VM on a different storage than the 
one the VPS is located in or the local storage I get the following error on 
resume:

The server failed to handle your request, due to an internal error.  The given 
message may give details useful for debugging the problem.
message: restore file signature mismatch: has suspend image been corrupted?

I have taken a few lines from xensource.log also after comparing two logs one 
that logged a good resume and an other that logged a bad one:

xenops] build_pre domid=75; max=1024 MiB; shadow=0 MiB; required=513 MiB
[20101125T14:15:51.451Z|debug|xcp1|40335 unix-RPC|VM.resume 
R:e73c5c4620af|backtrace] Raised at domain.ml:604.8-34 -> domain.ml:673.30-206 
-> vmops.ml:713.8-85 -> vmops.ml:782.5-84
[20101125T14:15:51.451Z|debug|xcp1|40335 unix-RPC|VM.resume 
R:e73c5c4620af|xapi] Vmops.restore (inner-handler) caught: INTERNAL_ERROR: [ 
Domain.Restore_signature_mismatch ]: calling domain_destroy

There is not much in xensource.log that may be relevant, I have spent a few 
hours analyzing those logs but everything seems ok until the signature error 
appears. 

I have also manually mounted the VDI that seems to have a bad suspend image, 
but everything just seems ok, the image is there, when resuming, the VDI is 
mounted ok a.s.o.

Most likely this isn't a bug in XCP since restoring from local storage also 
works ok.
I have created two other SRs with the same configuration as the main VM SR and 
suspending/resuming doesn't work on any of them.

Not sure if this matters but I have created the SRs on the same hardware, only 
the target names are different and the actual location on disk. 
My SR also uses ISCSISR and LUNperVDI a lot, but I am not sure if that matters 
also.

Offtopic, I have submitted a bug regarding ISCSISR, if someone can confirm if 
it was receive I would be glad, it seems I can only send to xan-api (?) 
mailinglist.

Best regards,
Tomoiaga Cristian

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