[linux-lvm] How well tested is the snapshot feature?
Joe Thornber
joe at fib011235813.fsnet.co.uk
Sat Jun 8 04:11:02 UTC 2002
On Sat, Jun 08, 2002 at 09:59:31AM +0100, Joe Thornber wrote:
> exceptions LVM1 and EVMS will perform the following steps:
>
> 1) Issue read of original chunk
> 2) wait
> 3) issue write
> 4) wait
I forgot about the metadata update:
6) issue metadata write
7) wait
device-mapper batches the metadata updates, under load this amortises
the cost away (well, to a point where I can't measure it).
- Joe
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