Re: [Xen-API] Host Down VDI Locked

[Chris Percol <chris.percol@xxxxxxxxx>]

Here are some notes I made on recovering from vdi not available after a power failure on our iscsi san. Just for reference for others as you seems to be sorted anyway.

###Fix VDI Problems after Power Failure###

#Steps that fixed 'vdi not available', sr backend failure

console

xe pbd-list sr-uuid=<uuid>

xe pbd-unplug uuid=<uuid>

Xen Center

Storage Forget

Storage > New Storage

xsconsole

Restore Virtual Machine Metadata

On Wed, Feb 23, 2011 at 9:09 PM, Rushikesh <rushikesh.jadhav@xxxxxxxxxx> wrote:

Hello all,

I am using and studying XCP from past 2 month and have got my self a
little acquainted with its architectural working.

My setup: 3 XCP 1beta hosts and shared iSCSI storage.  ( not the rc3 )

I have just started getting my hands dirty on code. (Python is very new
for me)

I had a case when my host was hard rebooted while VM on it were running.
And now all are refusing to start with Exception "VDI is unavailable".

So, when I started reading the traceback more closely I found that the
exception is generating at

File "/opt/xensource/sm/blktap2.py", line 1230, in _add_tag
if sm_config.get("writable") == "true":
   raise util.SMException("VDI %s already attached RW" % vdi_uuid)

I compared a crashed VDI and non crashed and saw that the crashed VDI
still has  a writable : true in sm-config.

# xe vdi-param-list uuid=03dfd013-bdd0-4c76-b099-4ad30d4018b6   (
Crashed VDI )

sm-config (MRO): writable: true; vhd-parent:
4841232c-09d9-47c6-8ba5-e68117745392;
host_OpaqueRef:205c3920-6b6d-c96b-a963-d16cdc21496f: active


# xe vdi-param-list uuid=f701575e-b399-4c02-a930-e3d0dee87b6e    (
Normal VDI )

sm-config (MRO): vhd-parent: 545b2f45-552a-474c-8b4f-f6079907fd21;
vdi_type: vhd


Then I started reading the code but Im getting little lost and I dont
want to make xe database corrupt. Recreating SR is a solution with a
risk of getting all VM rebooted.

So, I tried same scene with XCP1 and all VM were able to get
successfully boot. Nice work guys :)

I really want to understand how you did it and was I on correct path...
I really want to get into some development of XCP but my first problem
is already solved ;)


Thanks for patience and expecting a positive reply.

Regards,
Rushikesh





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