Hello, I have a question as it pertains to the checkarray function of Mdadm. I can't actually get it to do anything. I'm running Ubuntu 14.04.4 Server LTS with the latest mdadm installed. I have a single RAID 1 mirror configured and working properly near as I can tell. I can force a check if I issue "echo check > /sys/block/md0/md/sync_action" as root. I can then see the status of the check via /proc/mdstat or using the --detail switch on mdadm itself. However, nothing happens if I type in: /usr/share/mdadm/checkarray -a or /usr/share/mdadm/checkarray -a /dev/mdX or /usr/share/mdadm/checkarray -as I've tried the commands as root and using sudo. The array sits idle after all of the above commands. The only thing I can actually get checkarray to perform is to give me the help output if I pass it -h. I have attached, below, the current status of the mdadm managed array. Doing some Googling I haven't been able to find anyone else that isn't able to use the checkarray function so I must be doing something wrong. Any ideas? Rodman Frowert cat /proc/mdstat shows: ------------------ rodman@nas:/usr/share/mdadm$ cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdc1[1] sdb1[0] 5860389696 blocks super 1.2 [2/2] [UU] ----------------- sudo mdadm --detail /dev/md0 shows: ------------------ rodman@nas:/usr/share/mdadm$ sudo mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Fri Feb 26 14:07:40 2016 Raid Level : raid1 Array Size : 5860389696 (5588.90 GiB 6001.04 GB) Used Dev Size : 5860389696 (5588.90 GiB 6001.04 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Update Time : Tue Mar 1 07:40:19 2016 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Name : nas:0 (local to host nas) UUID : 4765e7df:0e1a6ad2:1321765f:a2d9f2c9 Events : 164 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 8 33 1 active sync /dev/sdc1 ----------------- -- 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