Help wanted very much! My setup: Thecus N5550 NAS with 5 1TB drives installed. MD0: RAID 5 config of 4 drives (SD[ABCD]2) MD10: RAID 1 config of all 5 drives (SD..1), system generated array MD50: RAID 1 config of 4 drives (SD[ABCD]3), system generated array 1 drive (SDE) set as global hot spare. What happened: This weekend I thought it might be a good idea to do a SMART test for the drives in my NAS. I started the test on 1 drive and after it ran for a while I started the other ones. While the test was running drive 3 failed. I got a message the RAID was degraded and started rebuilding. (My assumption is that at this moment the global hot spare will automatically be added to the array) I stopped the SMART tests of all drives at this moment since it seemed logical to me the SMART test (or the outcomes) made the drive fail. In stopping the tests, drive 1 also failed!! I let it for a little but the admin interface kept telling me it was degraded, did not seem to take any actions to start rebuilding. At this point I started googling and found I should remove and reseat the drives. This is also what I did but nothing seemd to happen. The turned up as new drives in the admin interface and I re-added them to the array, they were added as spares. Even after adding them the array didn't start rebuilding. I checked stat in mdadm and it told me clean FAILED opposed to the degraded in the admin interface. I rebooted the NAS since it didn't seem to be doing anything I might interrupt. after rebooting it seemed as if the entire array had disappeared!! I started looking for options in MDADM and tried every "normal"option to rebuild the array (--assemble --scan for example) Unfortunately I cannot produce a complete list since I cannot find how to get it from the logging. Finally I mdadm --create a new array with the original 4 drives with all the right settings. (Got them from 1 of the original volumes) The creation worked but after creation it doesn't seem to have a valid partition table. This is the point where I realized I probably fucked it up big-time and should call in the help squad!!! What I think went wrong is that I re-created an array with the original 4 drives from before the first failure but the hot-spare was already added? The most important data from the array is saved in an offline backup luckily but I would very much like it if there is any way I could restore the data from the array. Is there any way I could get it back online? -- 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
