[Xen-devel] TRIM support for VDI

[George Shuklin <nge@xxxxxxxx>]

Good day.

We have small discussion about way to dynamically allocate disk space on block 
devices for guest VM, and there is small idea:

If we creating sparsed VDI, it allow guest drive to grown 'on-demand', but we 
have no mechanism to put back to 'common pool' free drive space when files are 
removed in guest VM.

But we have nice command from SSD to make space free again: this command named 
TRIM. Most of modern operating system support it or will support in near future.

All we need - just to make trimmed area sparsed back again. And it we use a 
nice top-level storage with information deduplication, if we fill trimmed area 
by zeroes, it will be automatically deduplicated! And free space will be 
avaible for other VM!

-- 
wBR,George.

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