[kernel-bugs] [Bug 1159237] Changing an opensuse kvm machine root disk from virtio to scsi renders the machine unable to boot
https://bugzilla.suse.com/show_bug.cgi?id=1159237
https://bugzilla.suse.com/show_bug.cgi?id=1159237#c21
--- Comment #21 from Michal Suchanek
(In reply to Takashi Iwai from comment #14)
It's not a few bytes but a few mega bytes, nothing negligible if hundreds of VMs are deployed.
This seems like a non-argument to me on a few-fronts. Even small installs have Gb of packages installed, so Mb is not significant compared to this.
It is because with deduplication those GBs of packages are shared across all VMs running the same OS while the ramdisk is potentially unique.
Additionally, VM's on enterprise storage, often can be run with block deduplication, allowing shared content space saving. Certainly at my former workplace our Windows and Linux VM's base install's were able to deduplicate almost all disk blocks of shared content, including things like kernel images and initrd's, os libraries and more. That means that adding a few Mb here and there, ends up as inconsequential as it's all using shared references on the underlying storage. Hundreds of VM's would end up taking about 30GB max on the storage units.
Except there is high chance that the ramdisk is not identical across VMs and hence will not get deduplicated. -- You are receiving this mail because: You are the assignee for the bug.
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