The drives must be partitioned as "fd" Linux Raid Autodetect. I'm not sure you can convert the partition from what you have to "fd" without losing the data. I would set the new drive up as a RAID group by itself. Copy all the data from the existing drive to the new raid drive. Then repartition the old drive and synch it into the raid group. The basics raid steps are: partition the new drives as "fd" also configure your /etc/raidtab file issue mkraid You will need to unmount the raw partition (/dev/sda1) and mount the mirror drive (/dev/md0). Look in /usr/share/doc/raidtools for documentation and examples. Also, the man page for mkraid Bill > -----Original Message----- > From: redhat-list-bounces@xxxxxxxxxx > [mailto:redhat-list-bounces@xxxxxxxxxx]On Behalf Of Wilson CM Chan > Sent: Wednesday, May 26, 2004 11:59 PM > To: redhat-list@xxxxxxxxxx > Subject: Disk Mirror > > > Hi, > I have installed two SCSI 36G HDD in INTL SERVER under RH9 and it live > run. Now, I went to install two same HDD for software RAID in the live > run server. I went to know how to configure it. our data in HDD will be > lost after implemented the Software RAID? > Thanks > Wilson > > > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/redhat-list -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list