On (25/08/06 13:13), Chandler, Alan wrote: > I created a raid array with mdadm, thus > > mdadm --create=/dev/md0 --level=1 --raid-devices=2 /dev/sd[ab]4 > > and then turned /dev/md0 into a LVM physical volume, volume group and > some logical volumes. > > This worked great until I rebooted, at which point the start-up scripts > failed to recreate the raid array, and I got into tricky problems with > duplicate LVM PVs with the same UUID. [and ironically, since I used raid > to avoid it, some data loss - although fortunately I DO have backups] > > Two questions > > 1) In the Debian world, how do you make raid arrays persistent across > reboots?
It's been a while since I had to sort this on a few servers I was setting up but I recall it was a kernel/module issue. I recall I had to add the sata modules in /etc/modules to make sure they were loaded in time for the Raid configuration. I also found that I had to change kernels ... can't remember exactly why. Since sorting it the RAID arrays have been solid and persistent through reboots and powercuts. > [It appears that Debian does not use raidtools and /etc/raidtab as the > linux raid howto says) > > 2) If I do manage to create the array, what stops vgscan during LVM > startup from picking up 3 physical volumes (/dev/md0, /dev/sda4 and > /dev/sdb4) with the same UUID and only find /dev/md0? can't help with this. Regards Clive -- www.clivemenzies.co.uk ... ...strategies for business -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
