[Xen-users] VDI metadata corruption

[Bryan Wang <bryan.wango@xxxxxxxxx>]

Hi everybody,

Asked this on the Citrix storage forum and so far no replies...  I'd
really love to find a solution.   Thanks for reading and thanks even
more if you can help!

I'm running XenServer 5.6 SP2. I have a 2TB VDI that, when connected
to a VM, prevents the VM from turning on. I don't know how the VDI got
corrupted in the first place, it had been running fine for months and
then one day one of the 5 VDIs on this VM decided to disconnect
itself, the other 4 are fine. So far I have been unable to find a way
to fix this corrupted VDI. "vhd-util repair" appeared to have no
effect.

I am inexperienced with XenServer, but as far as I can tell, the
problem looks to be in the VDI's metadata. I've included the output of
vhd-util's check. I'd appreciate any info that you could give me on
how to fix this VDI and on how it might have gotten corrupted in the
first place.

And what's a "batmap"? :)

# vhd-util check -n
/dev/VG_XenStorage-29c98350-73f1-d32f-aa85-a5956de1ca11/VHD-b6bfc97a-b368-4205-8f20-8b7c8027a042
error calculating end of metadata: -22
/dev/VG_XenStorage-29c98350-73f1-d32f-aa85-a5956de1ca11/VHD-b6bfc97a-b368-4205-8f20-8b7c8027a042
appears invalid; dumping metadata
VHD Footer Summary:
-------------------
Cookie : conectix
Features : (0x00000002) <RESV&gt;
File format version : Major: 1, Minor: 0
Data offset : 512
Timestamp : Sat Sep 24 20:47:30 2011
Creator Application : 'tap'
Creator version : Major: 1, Minor: 3
Creator OS : Unknown!
Original disk size : 2097152 MB (2199023255552 Bytes)
Current disk size : 2097152 MB (2199023255552 Bytes)
Geometry : Cyl: 0, Hds: 4, Sctrs: 17
: = 0 MB (0 Bytes)
Disk type : Dynamic hard disk
Checksum : 0xfffff186|0xfffff186 (Good!)
UUID : eb2c2bb1-a920-42c5-a083-77eddf3344aa
Saved state : No
Hidden : 0

VHD Header Summary:
-------------------
Cookie : cxsparse
Data offset (unusd) : 18446744073709
Table offset : 1536
Header version : 0x00010000
Max BAT size : 1048576
Block size : 2097152 (2 MB)
Parent name :
Parent UUID : 00000000-0000-0000-0000-000000000000
Parent timestamp : Sat Jan 1 00:00:00 2000
Checksum : 0xfffff467|0xfffff467 (Good!)

failed to get batmap header

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