I am running software RAID1 on a somewhat critical server. Today I noticed one drive is giving errors. Good thing I had RAID. I planned on upgrading this server in next month or so. Just wandering if there was an easy way to fix this to avoid rushing the upgrade? Having a single drive is slowing down reads as well, I think. Thanks. Feb 7 15:28:28 server smartd[2980]: Device: /dev/sdb [SAT], 1 Currently unreadable (pending) sectors Feb 7 15:28:28 server smartd[2980]: Device: /dev/sdb [SAT], 1 Offline uncorrectable sectors Feb 7 15:58:29 server smartd[2980]: Device: /dev/sdb [SAT], 1 Currently unreadable (pending) sectors Feb 7 15:58:29 server smartd[2980]: Device: /dev/sdb [SAT], 1 Offline uncorrectable sectors [root at server ~]# smartctl -H /dev/sda === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED [root at server ~]# smartctl -H /dev/sdb === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED [root at server ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/md2 1.4T 142G 1.2T 12% / /dev/md0 99M 37M 58M 39% /boot tmpfs 7.9G 20K 7.9G 1% /dev/shm [root at server ~]# cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb1[1] sda1[0] 104320 blocks [2/2] [UU] md1 : active raid1 sdb2[1] sda2[0] 8385856 blocks [2/2] [UU] md2 : active raid1 sdb3[2](F) sda3[0] 1456645568 blocks [2/1] [U_] unused devices: <none> [root at server ~]# mdadm --detail /dev/md2 /dev/md2: Version : 0.90 Creation Time : Tue Jan 4 05:39:36 2011 Raid Level : raid1 Array Size : 1456645568 (1389.17 GiB 1491.61 GB) Used Dev Size : 1456645568 (1389.17 GiB 1491.61 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Fri Feb 7 15:21:45 2014 State : active, degraded Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Events : 0.758203 Number Major Minor RaidDevice State 0 8 3 0 active sync /dev/sda3 1 0 0 1 removed 2 8 19 - faulty spare /dev/sdb3 [root at server ~]# mdadm --detail /dev/md1 /dev/md1: Version : 0.90 Creation Time : Tue Jan 4 05:39:36 2011 Raid Level : raid1 Array Size : 8385856 (8.00 GiB 8.59 GB) Used Dev Size : 8385856 (8.00 GiB 8.59 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Fri Feb 7 14:29:36 2014 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Events : 0.460 Number Major Minor RaidDevice State 0 8 2 0 active sync /dev/sda2 1 8 18 1 active sync /dev/sdb2 [root at server ~]# mdadm --detail /dev/md0 /dev/md0: Version : 0.90 Creation Time : Tue Jan 4 05:48:17 2011 Raid Level : raid1 Array Size : 104320 (101.89 MiB 106.82 MB) Used Dev Size : 104320 (101.89 MiB 106.82 MB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Wed Feb 5 11:02:25 2014 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Events : 0.460 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 1 8 17 1 active sync /dev/sdb1