Date: Sun, 12 Mar 2006 15:52:03 -0600 From: Patrick Bowen <pbowen@fastmail.fm> To: freebsd-questions@freebsd.org Subject: Re: gmirror on a laptop. Message-ID: <44149803.5070803@fastmail.fm> In-Reply-To: <44142CB2.4030904@mac.com> References: <44137F59.5030800@fastmail.fm> <44142CB2.4030904@mac.com>
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Chuck Swiger wrote: >Patrick Bowen wrote: > > >>I wanted to fiddle around with gmirror(8) on a Dell C-600 Laptop. It has >>a 2-slice, 20 Gig HD, and I essentially wanted to mirror ad0s1 to ad0s2. >>I realize this will put the HD under stress, but otherwise it seems >>do-able. >> >>What I want to know is whether this is such an incredibly bad idea I >>shouldn't even consider it --or-- it seems like a good way to get >>familiar with gmirror, so go for it. >> >> > >If you want to do this for the sake of practice, by all means, feel free. > >However, mirroring onto the same device is going to result in almost no benefit >to reliability and will cause a very large performance hit, as well as reducing >the usable amount of disk space in half. (In other words, actually leaving the >machine set up that way would be an incredibly bad idea.) > > > Mr. Swiger; I agree, except that I had anticipated absolutely *no* benefit to reliability. If the disk goes bad, then having a mirror on the same disk, different slice, would still give me...no disk. I simply wanted to get the practice by actually doing, instead of just reading about it. I'll probably re-install Slackware on the other slice when I get done playing around. Thanks, Patrick
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