For a long time I thought of DRBD as a wayof getting shared storage or networkbased RAID-1 (as its website puts it), and I didn't entirely see thepoint. But there's a different way of looking at it, one that's quiteeye-opening and which I was recently exposed to somewhere.

A standard high availability setup for something like virtualizationhas four machines: two frontends and two backend disk storage machines,with the storage mirrored between the backends and both frontends

Mostly for historical reasons, my office workstation still runs itsown mailer and I still get a very small amount of email to it. I getmany, many more spam attempts, because for very many years (in thepre-spam days) it was the primary email address that I used and Iused it widely. Over the years I've put up an ever-increasing set ofanti-spam precautions that wind up rejecting almost all attempted SMTPconnections.

(Technically I wind up dropping connections after sending