sureshanaparti commented on PR #9270:
URL: https://github.com/apache/cloudstack/pull/9270#issuecomment-2718657476
> > Noticed incremental snapshots taking more physical size as earlier (you
mentioned here, these are the extra bytes to store the metadata, but it varies
- please check/confirm).
>
> > A file added with 300MB for each snapshot taken
>
> @sureshanaparti I'm not @JoaoJandre, but: your 4 first full snapshots
(taken with `kvm.incremental.snapshot` set to `false`) are all using 1.6 GB,
even though you are adding 300 MB every time you take a new snapshot. This
means that the files you created are still cached; they were not written to
disk yet. Therefore, the snapshots you took do not contain these files. You
need to execute `sync` before taking a snapshot so that the cached data is
written to disk.
>
> If you consider how many times you added 300 MB before taking the first
full snapshot with `kvm.incremental.snapshot` set to `true` (4 times), you'll
see that you created a total of 1.2 GB. This matches the size of the first full
snapshot with incremental snapshots enabled (1.6 GB originally + 1.2 GB created
= 2.8 GB of the first full snapshot with incremental snapshots enabled).
>
> Could you repeat your tests executing a `sync` before taking the snapshots?
@winterhazel sure, will retest with `sync` and update here. cc @JoaoJandre
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