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Storage migration and XS VHD issue


Hi guys,
we need to move all the VM's disk from one storage to another.
Due to extremely slow performance of the source primary storage, migrate
VMs and DATA disks from cloudstack does not work because of timeout.
So, the alternative, is to move VHD files directly between the storage and
change Cloudstack DB... but I see that each VM has a loooong VHD chain and
CS DB point to the last one.
So... first question is: WHY?
Second question is: how can I consolidate all these files in a single one?

vhd=88e504fa-08e8-4c82-abf6-1ebf8546ade2.vhd capacity=53687091200
size=18344002048 hidden=1 parent=none
   vhd=ecc7b0f1-63f1-4aac-9a69-39feb0db0b6e.vhd capacity=53687091200
size=3526001152 hidden=1 parent=88e504fa-08e8-4c82-abf6-1ebf8546ade2.vhd
      vhd=73353525-ef56-49db-bfdf-b4e87f668d40.vhd capacity=53687091200
size=147194368 hidden=1 parent=ecc7b0f1-63f1-4aac-9a69-39feb0db0b6e.vhd
         vhd=3c9c9803-dbd9-4993-98eb-78f9d5a9dd5a.vhd capacity=53687091200
size=701923840 hidden=1 parent=73353525-ef56-49db-bfdf-b4e87f668d40.vhd
            vhd=843874a3-6c2e-4e52-b3fd-f5cf6277d297.vhd
capacity=53687091200 size=73650688 hidden=1
parent=3c9c9803-dbd9-4993-98eb-78f9d5a9dd5a.vhd
               vhd=1abe6e83-09a8-4ee0-a2b7-270b47c7a461.vhd
capacity=53687091200 size=1235640832 hidden=1
parent=843874a3-6c2e-4e52-b3fd-f5cf6277d297.vhd
                  vhd=0cd07d92-d1d0-46f5-bc93-9f49bba72b74.vhd
capacity=53687091200 size=82055680 hidden=1
parent=1abe6e83-09a8-4ee0-a2b7-270b47c7a461.vhd
                     vhd=f038eae3-6912-4d52-a39e-276052dee777.vhd
capacity=53687091200 size=914149888 hidden=1
parent=0cd07d92-d1d0-46f5-bc93-9f49bba72b74.vhd
                        vhd=684abd94-f483-4721-9b1c-b8f82d6b7bd7.vhd
capacity=53687091200 size=84156928 hidden=1
parent=f038eae3-6912-4d52-a39e-276052dee777.vhd
                           vhd=e9e152e4-87bf-430d-8ec6-7f7b0f45c27a.vhd
capacity=53687091200 size=733442560 hidden=1
parent=684abd94-f483-4721-9b1c-b8f82d6b7bd7.vhd
                              vhd=9c01a612-99f7-4ba7-800f-c3c3b9d4b268.vhd
capacity=53687091200 size=241750528 hidden=1
parent=e9e152e4-87bf-430d-8ec6-7f7b0f45c27a.vhd

 vhd=74fb956e-1699-481e-8cba-f2a898c5eebf.vhd capacity=53687091200
size=752353792 hidden=1 parent=9c01a612-99f7-4ba7-800f-c3c3b9d4b268.vhd

vhd=bbb7c296-db11-4989-87ba-ed2e1a0d6dab.vhd capacity=53687091200
size=105169408 hidden=1 parent=74fb956e-1699-481e-8cba-f2a898c5eebf.vhd

 vhd=d38c45ea-2c3d-42b8-b804-0010e8be2e52.vhd capacity=53687091200
size=865821184 hidden=1 parent=bbb7c296-db11-4989-87ba-ed2e1a0d6dab.vhd

vhd=1c61f78e-b526-4383-9783-a2f54dad4c53.vhd capacity=53687091200
size=96764416 hidden=1 parent=d38c45ea-2c3d-42b8-b804-0010e8be2e52.vhd

 vhd=21d75884-4976-400c-92b3-eed01dcbfde5.vhd capacity=53687091200
size=1204122112 hidden=1 parent=1c61f78e-b526-4383-9783-a2f54dad4c53.vhd

vhd=d9581bd3-c93d-4938-9e59-740fbaff8fb2.vhd capacity=53687091200
size=96764416 hidden=1 parent=21d75884-4976-400c-92b3-eed01dcbfde5.vhd

 vhd=ba3a708b-932c-4024-9051-9fe30694b03b.vhd capacity=53687091200
size=912048640 hidden=1 parent=d9581bd3-c93d-4938-9e59-740fbaff8fb2.vhd

vhd=6c75cb97-6f64-4699-a0d4-93f906401e72.vhd capacity=53687091200
size=98865664 hidden=1 parent=ba3a708b-932c-4024-9051-9fe30694b03b.vhd

 vhd=41960a95-78f6-4e4f-9ec3-2c0d34e0b33f.vhd capacity=53687091200
size=815391232 hidden=1 parent=6c75cb97-6f64-4699-a0d4-93f906401e72.vhd

vhd=e32e9562-6873-490c-bc03-ecc98dfc95a1.vhd capacity=53687091200
size=79954432 hidden=1 parent=41960a95-78f6-4e4f-9ec3-2c0d34e0b33f.vhd

 vhd=dd160ab4-ff9a-4da5-a453-a55426393b04.vhd capacity=53687091200
size=836403712 hidden=1 parent=e32e9562-6873-490c-bc03-ecc98dfc95a1.vhd

vhd=15f9de9c-2da7-469d-9b86-1ccf79064b09.vhd capacity=53687091200
size=82055680 hidden=1 parent=dd160ab4-ff9a-4da5-a453-a55426393b04.vhd

 vhd=6e87a6c6-9e30-4202-b301-5846d6464241.vhd capacity=53687091200
size=899441152 hidden=1 parent=15f9de9c-2da7-469d-9b86-1ccf79064b09.vhd

vhd=0743f4d0-cf96-4a5d-97d7-3f5451482eb0.vhd capacity=53687091200
size=90460672 hidden=1 parent=6e87a6c6-9e30-4202-b301-5846d6464241.vhd

 vhd=09ad513b-2d1d-4878-bd30-12064a989b02.vhd capacity=53687091200
size=823796224 hidden=1 parent=0743f4d0-cf96-4a5d-97d7-3f5451482eb0.vhd

  vhd=787efd1f-cad7-444c-a30d-8edcfcd2dbc6.vhd capacity=53687091200
size=105169408 hidden=1 parent=09ad513b-2d1d-4878-bd30-12064a989b02.vhd

     vhd=1e9c643f-551a-425b-abba-e10d03ed7ca8.vhd capacity=53687091200
size=867922432 hidden=1 parent=787efd1f-cad7-444c-a30d-8edcfcd2dbc6.vhd

        vhd=ffbdd502-4517-484a-b1d3-891e451145b0.vhd capacity=53687091200
size=979288576 hidden=1 parent=1e9c643f-551a-425b-abba-e10d03ed7ca8.vhd

           vhd=5d5a3373-886b-427c-98bf-01f700cbd861.vhd
capacity=53687091200 size=1868116480 hidden=0
parent=ffbdd502-4517-484a-b1d3-891e451145b0.vhd