SW. I have what three systems available to me, two on my usual work desktop and another in a nearby room, all networked together. I have two monitors on my desk. Potentially I can run software actively on either desktop machine.
In truth, I run one. I use the others for alternatives and backup. I mean here failure backup; that is, if one PC is down I can go to another with relatively little loss of productivity. "Relatively" in my case means I'm out a half day or so playing catch up and updating software. This happens to me rarely enough that it makes up for the not doing more regular backups. For me, that is satisfactory.
Apparantly Zeuspaul has more stringent time requirements, so it's worth the time to him.
My point, which I'm getting to slowly, is that I find multiple systems in my environment relatively useless. I would prefer to have everything on one for day to day operations. Of course, my operations are software development, not trading.
However, I would be (would have been) out of business without another reasonably similar machine available to work on in a few cases. Say approximately 5 times in the past two or two and a half years. Not frequent, but often enough to scary. In my particular case, the three machines are a P6 200, a P5 133, and a P5 100, all running Win NT. These are not powerful machines by today's standards, but they are ALL capable of running the same software in a pinch, and I can move resources from one to another, physically relocating disk drives, video cards, and monitors if necessary owing to an extended outage.
On my next upgrade, my current thinking is to lose the second machine on my desktop and replace with multiple monitors. BUT I definitely want the second (and third) machines in the background as fall backs. Meanwhile, they work for backup servers and for other tasks around the house (my wife uses my "third" backup as her primary machine, for instance, and it contains the first level backups for everything critical; it's NT server with a mirrored disk and also domain controller, since I am on a corporate network and won't allow the corp to diddle with my personal files without authorization <g>.)
Sorry, once again I started to write a note but ended writing a treatise. Anyhow, there are lots of ways to use multiple systems without having them equal to each other.
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