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Re: Persistence
From: |
Jonathan S. Shapiro |
Subject: |
Re: Persistence |
Date: |
Mon, 31 Oct 2005 09:12:41 -0500 |
On Mon, 2005-10-31 at 02:45 +0100, R. Koot wrote:
> When I first read about persistance in EROS I though it was great, but
> there is still the problem that after a crash you are transported back
> in time. Doesn't this create more troubles than it solves? Especially in
> networked environments. I'm think about the case where my 'files' are
> stored on another computer, in particular. I also read EROS/KesKOS allow
> programs to force a snapshot, if this happens frequently doesn't this
> greatly reduce performance?
Persistence stops at the machine boundary. The difficulties of network
recovery after a crash are no better or worse than for any other system.
Yes, there exists a mechanism that allows certain applications to demand
a checkpoint now. This mechanism is considered sensitive, and it is NOT
available to applications in general. It is used by things like database
systems and system installers.
shap