Date: Tue, 23 Jan 2007 00:36:31 -0500 From: Jason Morgan <jwm-freebsd-questions@sentinelchicken.net> To: Jonathan Horne <freebsd@dfwlp.com> Cc: freebsd-questions@freebsd.org Subject: Re: gmirror setup Message-ID: <20070123053631.GD5367@sentinelchicken.net> In-Reply-To: <200701222211.05393.freebsd@dfwlp.com> References: <200701222211.05393.freebsd@dfwlp.com>
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On Mon, Jan 22, 2007 at 10:11:05PM -0600, Jonathan Horne wrote: > i just set up my first gmirror raid1, and... it was really simple. too > simple. "ok... what did i skip or do wrong?", was my first thought. I thought the exact same thing. My previous experience was with vinum and, while it was great 4 years ago (props to grog), the simplicity of geom for simple setups was greatly needed. > i follow the doc from onlamp.com: > > http://www.onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html?page=1 > > i did have one giant deviation tho, and im wondering if it really makes a > difference. the article depicts creating the gmirror immediately following > initial operating system install, but i did my example on a fully functioning > system. other than that, i have 2 identical disks, and things seem to be > working: > > castor# gmirror status > Name Status Components > mirror/gm0 DEGRADED ad0 > ad1 (33%) > > im sure im seeing less than the best performance since im using but a single > ide channel, but other than that, is it feasible to insert an identical disk, > and setup the gmirror at anytime a freebsd'er likes? Whether or not this is the *right* way to do it or not, I am not sure, but I can tell you that this is basically what I did on two servers about 6 months ago and I've had no problems. I even had a drive failure. When I plugged the new one in, it rebuilt correctly and has been running well since. > also, the doc didnt mention it, but if you do use to differing disk sizes, > obviously the smaller one should be ad0? and other than that, is there any > difference in setting up gmirror if the second disk is larger? Yes, make the first disk the smaller one. I don't believe there is a difference in setup, but the extra space on the second drive (say, ad2) will be wasted. Cheers, Jason
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