Thanks for the smartctl. Though smartctl -t short /dev/sdf passed the test, I was still unable to add the drive. Then I did this: #mdadm /dev/md2 --remove /dev/sdf #mdadm --stop /dev/md2 (after turning off all processes #dd if=/dev/zero of=/dev/sdf dd: writing to `/dev/sdf': Input/output error 8522041+0 records in 8522040+0 records out 4363284480 bytes (4.4 GB) copied, 138.782 s, 31.4 MB/s Appears to be a bad drive, I will replace it. Sundar ________________________________________ From: Phil Turmel [philip@xxxxxxxxxx] Sent: Monday, March 25, 2013 1:43 PM To: Paramasivam, Meenakshisundaram Cc: linux-raid@xxxxxxxxxxxxxxx Subject: Re: mdadm RAID6 faulty drive On 03/25/2013 12:02 PM, Paramasivam, Meenakshisundaram wrote: > > Hi, > > As a result of extended power outage, the FedoraCore 17 machine with > mdadm RAID went down. Bringing it up, I noticed "faulty /dev/sdf" in > mdadm -detail. However mdadm -E /dev/sdf shows "State : clean". > Details are shown below. When I tried to add the drive to array, > resync fails (I see lots of eSATA bus resets), and I get the same > message in mdadm -detail. > > Questions: > 1. How can a clean drive be reported faulty? When the drive is kicked out for I/O errors its superblock is left as-is (just as if you pulled its sata cable). The remaining devices' superblocks are marked to show the failed drive, and *their* superblocks' event count is bumped. The failed status of that device is derived during assembly when its superblock is found to be stale. > 2. Is there a easy way to mark drive (/dev/sdf) as "assume-clean" and > add it? No. The closest thing is to use a write-intent bitmap and "re-add" devices that are disconnected. That's not your problem. > Please let me know if I should get an exact replacement drive at > this stage, pull out faulty /dev/sdf, and add the new drive to array. > Thanks. You very likely need a new drive. You might want to try plugging that drive into a different controller, or a different port on the same controller, just to narrow the diagnosis. You could also show us some of the kernel error messages, or show the output of "smartctl -x /dev/sdf". Phil -- 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
