Hello and a happy new year! I need to reopen this thread because there are still things going on that I don't fully understand. I changed the disk_format of all the images that were affected by my mistake a couple of weeks ago. I deleted the base files in /var/lib/nova/instances/_base and launched new instances, leading to expected cow clones: ---cut here--- control:~ # openstack image show 5f486361-5468-42a0-9993-9cdda3450b0e | grep disk_format | disk_format | raw| control:~ # rbd children images/5f486361-5468-42a0-9993-9cdda3450b0e@snap images/029bfb90-cbab-4a7c-a51c-27807ab41ce7_disk images/ccd4498f-c0a0-480a-ab4b-6224d63e78fa_disk images/d5379918-40a0-4119-9e47-773c0ab8c0f3_disk ---cut here--- These are only three clones, but I have 16 instances based on the same image: ---cut here--- +--------------------------------------+ | uuid | +--------------------------------------+ | 87dfbb4f-784d-4390-a0c9-d3162a56ea7e | | bb56995d-d3ea-464d-94fe-382880bf2a92 | | d4fde2fe-140e-4904-90e8-996cc418302d | | 7bd4fdc0-d6b7-47cb-adb3-324abff6a0e5 | | bef8e4fe-b2f4-44f5-a144-36ced37007ac | | bcc005fc-fa12-4dd9-b531-cbccfb7c426a | ###| ccd4498f-c0a0-480a-ab4b-6224d63e78fa | ###| 029bfb90-cbab-4a7c-a51c-27807ab41ce7 | ###| d5379918-40a0-4119-9e47-773c0ab8c0f3 | | abd2c0bc-2e66-4e2a-9f4c-f006937c7b27 | | e07c0f5e-403e-4ad3-b04f-fb306e99869e | | edec4aa0-9459-4444-bbb8-03097bccba4c | | ca4449f5-921d-4ce5-8559-fc719cfbc845 | | 8bff1799-391e-4620-9b11-134962084b84 | | 9d927ac4-d7d3-45cb-8628-b267a6d0e668 | | 54cfeede-44f9-49bd-9f49-ef4dcacff953 | +--------------------------------------+ ---cut here--- Those three cow clones were created after adjusting the disk_format, some of the rest were created before the changes, the others have been created after the changes. Can anyone explain why a new base image is created? I downloaded the glance image and double-checked the file format, I also exported the snapshot which should be used to create clones, there's only one discrepancy (disk size), but I don't think this could be relevant: ---cut here--- control:~ # qemu-img info /var/lib/glance/images/image-snap.img image: /var/lib/glance/images/image-snap.img file format: raw virtual size: 5.0G (5368709120 bytes) disk size: 2.5G control:~ # qemu-img info /var/lib/glance/images/image.img image: /var/lib/glance/images/image.img file format: raw virtual size: 5.0G (5368709120 bytes) disk size: 5.0G control:~ # md5sum /var/lib/glance/images/image.img b9b28dd300a6fbb1de2081f1cb8a07d0 /var/lib/glance/images/image.img control:~ # md5sum /var/lib/glance/images/image-snap.img b9b28dd300a6fbb1de2081f1cb8a07d0 /var/lib/glance/images/image-snap.img ---cut here--- I also tried to find something with the glance-cache-manage cli, but I can't even connect to that service, I guess it has never been used. control:~ # glance-cache-manage list-cached Failed to show cached images. Got error: Connect error/bad request to Auth service at URL http://control1.cloud.hh.nde.ag:5000/v3/tokens. I don't know how to fix that yet, but could this be a way to resolve that issue? Regards, Eugen Zitat von melanie witt <melwittt@gmail.com>:

On Fri, 12 Oct 2018 20:06:04 -0700, Remo Mattei wrote:

...

I do not have it handy now but you can verify that the image is indeed raw or qcow2

As soon as I get home I will dig the command and pass it on. I have seen where images have extensions thinking it is raw and it is not.

You could try 'qemu-img info <image>' and get output like this, notice "file format":

$ qemu-img info test.vmdk (VMDK) image open: flags=0x2 filename=test.vmdk image: test.vmdk file format: vmdk virtual size: 20M (20971520 bytes) disk size: 17M

[1] https://en.wikibooks.org/wiki/QEMU/Images#Getting_information

-melanie

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