On Sat, Apr 23, 2011 at 3:06 PM, Edward Ned Harvey <openindi...@nedharvey.com> wrote: >> From: Roy Sigurd Karlsbakk [mailto:r...@karlsbakk.net] >> >> That's theory, in practice, even with sufficient RAM/L2ARC and some amount >> of SLOG, dedup slows down writes to a minimum. My test was done with 8TB >> net storage, 8GB RAM, and two 80GB x25-M SSDs devided into 2x4GB SLOG >> (mirrored) and the rest for L2ARC. > > In theory, dedup should accelerate performance when data is duplicated. > > In the specs you quoted above, you have not nearly enough ram. I would say > you should consider 4G or 8G to be baseline if you have no dedup and no > l2arc. But when you add the dedup and the l2arc, your ram requirements > increase. > > With the 8T storage... Add 8-16G ram to your server on top of your baseline. > > I'm not sure how to calculate extra ram requirements for l2arc.
Isn't it too much? I asked elsewhere and looks like they have lower needs for RAM http://www.shiningsilence.com/dbsdlog/2011/04/22/7647.html > > > _______________________________________________ > OpenIndiana-discuss mailing list > OpenIndiana-discuss@openindiana.org > http://openindiana.org/mailman/listinfo/openindiana-discuss > _______________________________________________ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
