Hi, I have a fedora15 system with two 80GB SATA disks using RAID1 and have the following messages in syslog: Nov 4 07:43:11 mail smartd[2001]: Device: /dev/sda [SAT], 2 Offline uncorrectable sectors Nov 4 08:13:11 mail smartd[2001]: Device: /dev/sda [SAT], 2 Currently unreadable (pending) sectors "smartctl --all /dev/sda" does show that errors did occur at some point in the past, but it doesn't seem to be affecting the RAID: # cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda2[0] sdb2[1] 74750908 blocks super 1.1 [2/2] [UU] bitmap: 1/1 pages [4KB], 65536KB chunk md0 : active raid1 sda1[0] sdb1[1] 511988 blocks super 1.0 [2/2] [UU] unused devices: <none> Perhaps the bad sectors haven't been accessed, which is why the RAID still appears to be intact? Do I need to verify the RAID integrity in some way? Force a rebuild? I believe the boot sector is installed on sda, which is also the bad disk. If I remove the disk to replace it, I'm concerned the system will no longer boot. Can you point me to instructions on the best way to replace a disk? Thanks, Alex -- 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