Warning: I'm not certain this info is correct (I test on fake loopback arrays before taking my own advice - be warned). More authoritative folks are more than welcome to correct me or disagree. create is safe on existing arrays in general, so long as you get the old device order correct in the new create statement, and you use the 'missing' keyword appropriately so resyncs don't start immediately and you can mount the device to make sure you're data is there. Once you're certain, you add a drive in place of the missing component, sync up, and you're set. In this case, that'd be an 'mdadm --create -l1 -n2 /dev/md0 /dev/sda1 missing'. You should have an array there that you can test. But wait! If the superblock wasn't persistent before, it's possible that the device is using the space that would be used for the superblock for filesystem information - it may not be reserved for md use. This is where I'm not sure. If that's the case, re-creating with persistent superblocks may clobber the end of your filesystem, and you may not notice until you try to use it. There was a thread quite recently (one week? two? can't quite remember) specifically about putting a non-raid FS into a raid set that touched on these issues, and how to do the FS shrink so it would have room for the raid superblock. I'd refer to that. The goal being to shrink 1MB or so off the FS, create the raid, then grow the FS to max again (or let it be, whatever) -Mike Peter Greis wrote: > Greetings, > > I have a SuSE 10.0 raid-1 root which will not properly > boot, and I have noticed that / and /boot have > non-persistent super blocks (which I read is required > for booting). > > So, how do I change / and /boot to make the super > blocks persistent ? Is it safe to run "mdadm --create > /dev/md0 --raid-devices=2 --level=1 /dev/sda1 > /dev/sdb1" without loosing any data ? > > regards, > > Peter > > PS Yes, I have googled extensively without finding a > conclusive answer. > > > Peter Greis > freethinker gmbh > Stäfa Switzerland > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
