@Pilow Does disk show up after you do the snapshot? If it is able to do the snapshot there is a high chance it can boot up. So try booting up (and check for disk) and shut it down and do the snapshot at that time if the disk show up. It helps to boot up on the old v5 commit and check from that side too if you have both copy before the commit update. Yep I can confirm that snapshot doesn't always work. But using the older v5 that used to work before the update does get it showing up on the newer v5 commit if I go through whole snapshot, revert, etc. one of those case work.

@Pilow Lol glad I was able to help. Its only if you have a few VMs having hundreds will be a nightmare... giod luck to those that has that issue. In the meantime I will use the method I mention for now.

I am summoning @storage (especially G. R. )

@Bastien-Nollet another good day I think i'll swap to feedback if problem is back than problem is not here anymore [image: 1767900573191-6f10060d-d9fb-4a06-8129-3545e05205e4-image.png] on your side to find something sexier than delay ^^' but it seems to be a race condition

@Thiago_FS_Dantas hi, did you check NESTED VIRTUALISATION in the advanced tab of your VM ? [image: 1767872120619-3f93e473-b1eb-4a92-aca7-a684ff9a23ae-112fdd1c-a3bf-4636-81a9-f24aecd818f7.png]

Hello @olivierlambert, @bastien-nollet, Hello Everyone !! I used vhd-cli with its new arguments and it worked ok. vhd-cli check --chain 'file:///run/xo-server/mounts/11934fec-f3a1-4f7f-a78d-00eeb1b39654?useVhdDirectory=true&encryptionKey=%22O1xt1ZTRE%5Qq%3X%3D1NZ%26%3ZZQo8%2DD%29s5xt%3OOko%22' 'xo-vm-backups/abc3e130-923e-619e-4fdc-59bcda088586/vdis/cecc4489-722a-4f79-b5e6-c050f63f2761/d489173c-028a-46f0-b712-f4a7c5594c8f/20260108T160552Z.alias.vhd' ok: xo-vm-backups/abc3e130-923e-619e-4fdc-59bcda088586/vdis/cecc4489-722a-4f79-b5e6-c050f63f2761/d489173c-028a-46f0-b712-f4a7c5594c8f/20260108T160552Z.alias.vhd But I discovered that using vhd-cli in this way only checks the physical structure of the alias.vhd file. It doesn't check the integrity of the blocks or the total number of blocks to detect a missing block. (It doesn't work like it does with huge monolithic .vhd files, where it detects errors with the slightest modification.) So I opted to split the solution: I check the integrity of the filesystem where the files are stored (using btrfs scrub). I verify that the number of blocks written in the backup is correct (that no blocks are missing). I verify that the written blocks haven't been modified since they were written. For point 2, I found (AI) that I could use "vhd-cli info" to find out the total number of blocks in the backup (I don't have much information about it), but when I run it, I get the following error. I suspect it doesn't work with (Encrypt all new data sent to this remote): vhd-cli info --chain 'file:///run/xo-server/mounts/11934fec-f3a1-4f7f-a78d-00eeb1b39654?useVhdDirectory=true&encryptionKey=%22O1xt1ZTRE%5Qq%3X%3D1NZ%26%3ZZQo8%2DD%29s5xt%3OOko%22' 'xo-vm-backups/abc3e130-923e-619e-4fdc-59bcda088586/vdis/cecc4489-722a-4f79-b5e 6-c050f63f2761/d489173c-028a-46f0-b712-f4a7c5594c8f/20260108T160552Z.alias.vhd' ✖ Unhandled remote type Error: Unhandled remote type at getHandler (/usr/lib/node_modules/vhd-cli/node_modules/@xen-orchestra/fs/dist/index.js:48:11) at getSyncedHandler (/usr/lib/node_modules/vhd-cli/node_modules/@xen-orchestra/fs/dist/index.js:54:19) at Object.info (/usr/lib/node_modules/vhd-cli/commands/info.js:98:24) at Object.runCommand (/usr/lib/node_modules/vhd-cli/index.js:32:13) at /usr/lib/node_modules/vhd-cli/node_modules/exec-promise/index.js:57:13 at new Promise (<anonymous>) at execPromise (/usr/lib/node_modules/vhd-cli/node_modules/exec-promise/index.js:56:10) at Object.<anonymous> (/usr/lib/node_modules/vhd-cli/index.js:41:1) at Module._compile (node:internal/modules/cjs/loader:1706:14) at Object..js (node:internal/modules/cjs/loader:1839:10) Could you please help me with this? I'm not sure if I'm on the right track. Perhaps there are other ways I'm missing.

@Pilow does SR.scan checks only keep-alive or do any kind of write operation or anything else? cc: @nikade @olivierlambert