jtriende at wisc.edu
Tue Jan 23 14:29:27 UTC 2007
> i just set up my first gmirror raid1, and... it was really simple.
> simple. "ok... what did i skip or do wrong?", was my first thought.
> i follow the doc from onlamp.com:
> i did have one giant deviation tho, and im wondering if it really
> makes a
> difference. the article depicts creating the gmirror immediately
> initial operating system install, but i did my example on a fully
> system. other than that, i have 2 identical disks, and things seem
> to be
> 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
> and setup the gmirror at anytime a freebsd'er likes?
> also, the doc didnt mention it, but if you do use to differing disk
> 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?
The surest way to test your raid is to unplug the IDE cable to one
drive while the system is running and see if it still works. Plug it
back in and rebuild the drive. Do the same for the other drive.
Setting up gmirror on a new system is straight forward; trying to set
it up on a system that can't be taken down for a day can be a major
I would like to stress that a mirrored RAID setup is no substitute
for a solid backup plan. If there is a data error, gmirror will
faithfully replicate that error on the other drive. You may not find
out that a drive has failed until both drives fail especially if
you're not keeping a close eye on your daily reports, so a backup is
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