Good day.
Found strange behavior (bug?) in xapi: it removes vhd-parent from
sm-config of VDI after removing most recent snapshot.
How to reproduce:
VDI=`xe vdi-create ....`
SN1=`xe vdi-snapshot uuid=$VDI`
(perform some write operations on VDI to force creation of second base
copy)
SN2=`xe vdi-snapshot uuid=$VDI`
xe vdi-destroy uuid=$SN2
xe vdi-list uuid=$VDI params=sm-config
Expected:
sm-config vhd-parent: uuid_of_corresponding_base_copy
Got:
sm-config contains no vhd-parent.
Why this important? vhd-parent links alllows to calculate sizes of all
VHD's, related to snapshot/clone tree. Without vhd-parent we need to
rely on snapshort-of and snapshots fields, which are not really reliable
(vdi-clone break the chain).
This bug does not affects snapshot functionality, AFAIK real VDI chain
is reconstructed from internal headers of VDI, but affects software
using XenAPI.
Thanks.
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