I installed RH 7.3 on raid1 using the standard RH 7.3 GUI setup. Everything installs fine. According to mdstat raid1 seems to be running fine: # cat /proc/mdstat Personalities : [raid1] read_ahead 1024 sectors md1 : active raid1 hda5[0] hdc5[1] 3494016 blocks [2/2] [UU] md2 : active raid1 hda3[0] hdc3[1] 16892224 blocks [2/2] [UU] md3 : active raid1 hda2[0] hdc2[1] 19454592 blocks [2/2] [UU] md0 : active raid1 hda1[0] hdc1[1] 361344 blocks [2/2] [UU] unused devices: <none> However when shutting down the system and disconnecting the 1st IDE drive I cannot boot from the mirrored disk. I assume this is because the MBR is not mirrored. So to see if all the data is present on the mirrored disk I launch the "linux rescue" mode from the RH7.3 CD but it cannot find any partitions to mount from on the 2nd mirrored disk. Making the same with the primary ide disk works fine, in thsi case "linux rescue" can mount all partitions. How can I check if all data is being mirrored on the 2nd ide disk? How do I make the 2nd ide disk bootable? (I use grub as bootloader) I already tried: root (hd1,0) setup (hd1) regards, Christian - 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