On 3/4/20 10:19 PM, Guerlan wrote:
I'm curious about how Qubes does this:
mounts /home/user and other user-related directories from disk B
mounts the / from disk A, but when VM shutdowns, disk is discarded
I'm curious on how it mounts disk A. I don't think it makes a copy of
disk A to a temporary disk A', because that'd move lots of gigabytes on
every VM startup.
However, it also can't mount disk A as read-only, because I can write to
it, it just gets discarded.
How does this work? And is it exclusive of Xen? Couldn't I do the same
in KVM? It's very useful
As to whether this can be done with KVM, yes you can. But Linux vendors
are very confused about which copy-on-write technologies to promote so
they tend to push the least common denominator, which is partitions or
VMDK files. OTOH, Qubes decided copy-on-write storage was too useful to
ignore and integrated it into VM management functions.
You could use LVM thin pools with KVM, but IIRC you would have to
automate snapshot handling yourself or find an additional package to do
it (if such exists).
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Chris Laprise, [email protected]
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https://twitter.com/ttaskett
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