Re: OnLine Mirroring

Posted in 1992

Jonathan Leffler — Tue, 13 Oct 92 04:17:12 GMT — source: Informix-list mailing list archive (1991-1998)

>From: uunet!xact.demon.co.uk!ptm (Paul Thomas Mahoney) >Subject: OnLine Mirroring >Date: 12 Oct 92 11:26:27 GMT >X-Informix-List-Id: <news.1957> >When you INITIALISE an OnLine system you can enable/disable the disk mirroring >capability. If you enable mirroring you can later, optionally, enable disk >mirroring of dbspaces. >We have now decided not to employ mirroring of dbspaces. What performance >overhead have we incurred because we said "yes" to the initialisation time >mirror parameter? You are wasting a few bytes of shared memory (of the order of 100s of bytes rather than kilobytes). Otherwise, my understanding is that there is no overhead. Yours, Jonathan Leffler (johnl@obelix.informix.com) #include <disclaimer.h>