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 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 following
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 identical
and setup the gmirror at anytime a freebsd'er likes?

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?


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 headache.

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 essential.

James Riendeau
MMI Computer Support Technician
1300 University Ave
Rm. 436, Dept. of MedMicro
Madison, WI  53706

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