On Sat, 2004-02-07 at 12:37, Mike Perry wrote: > Thus spake Mike Perry (mikepery@fscked.org): > > > Well, this is probably a FAQ, but I've really looked around.. > > Does anyone have any experience with using raidreconf for RAID1, or have > > a way to hotadd a disk and have it become active, instead of being a > > spare? > > Ok, in my impatience I grew some balls.. As it turns out, the RAID1 > superblock is (seemingly?) independent of the contents of the volume. So > I was able to simply mkraid --force /dev/md0, this time WITH a > failed-disk directive. Once this was done, I was able to mount /dev/md0 > right away, no reformatting or anything needed. > > Then I hot-added the failed-disk, and it seems to be synching properly. > > And also this time the failed-disk wasn't mirrored to immediately either > (ie without the explicit hotadd).. I wonder why that happened the last > time I did this.. Maybe I just miswrote the raidtab on that occasion.. > Or possibly the partition type was raid autodetect and after the reboot > the md driver saw this and decided to start mirroring, regardless of > raidtab? > > Anyways, sorry for the spam, but I imagine at least one other poor sap > out there will find this useful ;) I'm that one. I ended up at the same place but for another reason. I was in a hurry to build my system and knew that converting a ext3 to raid would cause some problem because of some extra raid info, so I defined a raid1 with only one disk. Later I bought the other disk and tried to add it by changing /etc/raidtab but that did of course not work and it was at this point I started to actually read the doc... I saw reference to an old version of mkraid that would reinitialize the superblock only (--superblock-only) and keep the data, but newer raidtools doesn't do that. If that been there or some manpage in the later version describing it a bit clearer I could dear to do mkraid -f but with all incarnations of the raid software I no longer know what is safe in my version. My current state is that I have root mounted as /dev/md0 created with one disk (/dev/hda5) as disk 0. I have since then added another disk and partitioned it equal. I now want to add /dev/hdc5 to md0 (was never mentioned before). If I add that to raidtab as failed-disk and do "mkraid -f", will I loose anything? > > P.S. I also looked at the src for raidreconf.. it in fact only supports > raid0 and 5, and seems to be nice enough to refuse to do anything if you > have a different raid level. So they got that going for them, which is > nice. -- ------------------------------------------------------------------- Techwiz, Peter Sjoberg PGP key (12F506C8) on keyserver & homepage Key fingerprint = 3DC2 CEBA 1590 B41A 3780 955A DB42 02BB 12F5 06C8 mailto:peters AT techwiz.ca http://www.techwiz.ca/~peters - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
