{"id":8659,"date":"2016-06-21T07:23:08","date_gmt":"2016-06-21T05:23:08","guid":{"rendered":"http:\/\/lukse.lt\/uzrasai\/?p=8659"},"modified":"2016-06-21T09:23:14","modified_gmt":"2016-06-21T07:23:14","slug":"raid6-reconstruction-attempt","status":"publish","type":"post","link":"https:\/\/lukse.lt\/uzrasai\/2016-06-raid6-reconstruction-attempt\/","title":{"rendered":"RAID6 reconstruction attempt"},"content":{"rendered":"

\"raid6_help3\"<\/a>This is attempt log to recover data from RAID6 NAS disk storage. <\/p>\n

<\/div>\n

Initial state<\/h3>\n

NAS: LACIE 5Big network 2<\/a> (5 disks, 3T each in RAID6 array) online of almost 1000 days. Data value\/importance high.<\/p>\n

Disk #5 started blinking red. Pff… I thought, not the first time. Just replace a disk and it will be fine. It is RAID6 and only one disk is failing. Anyway quick format and quick attempt to wipe data (stopped due to long estimated time) and plugged again into NAS. It started syncing as usual. After a while noticed speed drop copying files. Not quite sure what I did next, but ended rebooting NAS and it stuck in boot sequence. No online connection was present. Left it overnight thinking it has to sync or whatever. Next day, there were still no connection only main LED was flashing blue while all disk leds were solid blue. Stuck in boot sequence I thought. Rebooted again (this time had to pug power off). Booted pretty soon, but RAID array was gone. Also nas stated that disk #3 was “NEW” (I have replaced it some time ago, and seems like it was not initialized by itself? Though there were partitions present).<\/p>\n

What’s next<\/h3>\n

Let’s not fuck up things worse than it is!<\/strong> Also write numbers on all NAS slots and hard disks.
\n<\/strong><\/p>\n

NAS was in use and pretty important data was stored on it, so naturally I was biased, it did not helped to think clearly. Next I faced many secondary problems like computer refusing to detect keyboard and mouse while booting (dah… switched USB legacy mode for USB3.0). Spent half an hour or more figuring this out. Left it heal by itself, tried to run system on old atom computer. Also failed due to other unknown reasons. Another wasted half an hour or more. Seems like everything is resisting to work. Got back to big computer and made it work (Legacy mode\/USB3.0 stuff). Ok, have 3 disks connected:<\/p>\n

    \n
  1. W1F3AFDP<\/li>\n
  2. W1F3AJ9H<\/li>\n
  3. empty<\/li>\n
  4. W1F59CLA<\/li>\n
  5. empty<\/li>\n<\/ol>\n
    \"IMG_9815_r\"<\/a>

    Quick and dirty. 3 disks connected to big computer.<\/p><\/div>\n

    Trivial task connecting disks to computer took longer than expected.<\/p>\n

    Inspecting<\/h3>\n

    Next thing was to examine disks and reassemble RAID. So tried variety of software:<\/p>\n