[dm-devel] [RFC] [PATCH] lvm2: mirroredlog support
Alasdair G Kergon
agk at redhat.com
Wed Sep 30 16:35:20 UTC 2009
On Wed, Sep 30, 2009 at 10:50:06AM -0500, Jon Brassow wrote:
> As long as we are on the topic of mirror logs (and this is unrelated to
> your patch), I'd like to complain about the current behavior of log
> allocation vs the log policy. I don't think it should take
> 'alloc_anywhere' for a log to be placed on the same disk as one of the
> mirror legs... that should be 'alloc_normal'.
It was assumed that performance would be better this way, but I have
never seen any tests to prove or disprove that. Maybe someone could run
some?
One way we could handle this is by creating a new policy between
NORMAL and ANYWHERE that does this, then renaming the old NORMAL
to something else and the new policy to NORMAL.
Alasdair
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