Dietmar Maurer wrote:
Also, on _loaded_ systems, I noticed creating/removing logical volumes
can take really long (several minutes); where allocating a file of a
given size would just take a fraction of that.
Allocating a file takes much longer, unless you use a 'sparse' file.
If you mean "allocating" like with:
dd if=/dev/zero of=image bs=1G count=50
Then of course, that's a lot of IO.
As you mentioned, you can create a sparse file (but then, you'll end up
with a lot of fragmentation).
But a better way would be to use persistent preallocation (fallocate),
instead of "traditional" dd or a sparse file.
--
Tomasz Chmielewski
http://wpkg.org
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