What sort of drive and interface is this on? Look at the system log files to see if there are low level driver errors being logged. I am investigating similar problems with SATA drives droping out of RAID 1 due to ata level problems. -----Original Message----- From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Adam Huffman Sent: 04 November 2009 16:18 To: linux-raid@xxxxxxxxxxxxxxx Subject: RAID1 array losing one member I have an annoying problem with a RAID1 array. One of the members keeps dropping out of the array: /dev/md0: Version : 0.90 Creation Time : Sun Jun 28 13:24:02 2009 Raid Level : raid1 Array Size : 732571904 (698.64 GiB 750.15 GB) Used Dev Size : 732571904 (698.64 GiB 750.15 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Wed Nov 4 16:12:36 2009 State : clean, degraded Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 UUID : 281b623a:4f01e4e1:36bee1ae:cd0903da Events : 0.4682740 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 1 0 0 1 removed 2 8 17 - faulty spare /dev/sdb1 I've run extended SMART self-tests and the manufacturer's diagnostic test on the drive - in neither case is any error found. When I try to re-add the disk, reconstruction of the array begins. However, it always fails, at different points. Is there another test I can run to see what might be wrong with the drive? Could this be a different MD problem? The machine is running Fedora 10, kernel 2.6.27.37-170.2.104.fc10.x86_64. This is the device that keeps failing: /dev/sdb1: Magic : a92b4efc Version : 0.90.00 UUID : 281b623a:4f01e4e1:36bee1ae:cd0903da Creation Time : Sun Jun 28 13:24:02 2009 Raid Level : raid1 Used Dev Size : 732571904 (698.64 GiB 750.15 GB) Array Size : 732571904 (698.64 GiB 750.15 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Update Time : Tue Nov 3 17:20:42 2009 State : active Active Devices : 1 Working Devices : 2 Failed Devices : 1 Spare Devices : 1 Checksum : e5396754 - correct Events : 4651695 Number Major Minor RaidDevice State this 2 8 17 2 spare /dev/sdb1 0 0 8 1 0 active sync /dev/sda1 1 1 0 0 1 faulty removed 2 2 8 17 2 spare /dev/sdb1 Adam -- 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 -- 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
