Slowmo escribió:I connected 3 more drives to existing ones (all of the drives are 1Tb) and added them to array using RST GUI application. Array started to expand.
Then after couple of hours I had to restart the computer and for some reason Chkdsk..
Did you let the system finish the RAID5 build? "a couple of hours" sounds very short time for a 3TB RAID5 to rebuild. I think you killed your own RAID5 build before it finished, and it looks like your datta is scattered over the disks. RAID5 data distribution and parity distribution has to do with the controller, not the file system. Everything points to a definitive data loss.
The rebuild process was not complete after couple of hours. I had to restart because I changed some settings which required a restart. I think that was a computer name which I changed. And at that point file system was already damaged because chkdsk was run and fixed a lot of errors. As I mentioned before, after the restart many of the files were still usable. I thought I will wait for rebuild to finish (which took exactly one week - 5Tb after all) and then deal with damaged files. But unfortunately after the rebuild, data on disks was so corrupt that even chkdsk could not repair it. It detected that file system was NTFS, but could not do much more. Windows reported partition as being RAW, so I could not access files which were good after the restart but before the completion of rebuild process. So I think that rebuild process instead of rearranging data on all of the disks, screwed data up slowely while "rebuilding".
So when I understood that nothing could be recovered, I did a full format of an array (that took almost 24h) and now it works. Using 9.5 all of the drives were being marked with warning sign from time to time for no reason (some kind of SMART warning). But with 9.6 it does not happen anymore and array has been working fine since then.
Thanks for your feedback.
At first, apparently the Operating-System support Hard-Disk-Drives bigger than 2 TB and that is enjoable because I would to enlarge my drive space.
For second, again apparently the firmware 8.9 and 9.5 don't work properly, so 8.8 and 9.6 are running well.
But some questions are still open:
1. Why using the RAID 5 instead of RAID 10? Have you only 3 HDD?
2. Why only each second firmware is working properly?
Thanks again and best regards
Why Raid 5 instead of Raid 10? Because of high Raid 10 overhead. On Raid5 with 6 drives I get 5Tb space, but it would only be 3Tb on Raid 10. I don't need high performance, becuase the array is mainly used as network storage. By the way, I get about 300Mb/s average read spead on this array anyway, so it is more than I need. Write performance is not important to me.
It has been a long time since I posted my issue and now using 10.6.0.1002 drivers I see the following in Resolved Issues list:
Reboot during capacity expansion of a RAID volume migration (after having added a disk to the volume) causes the volume to go failed
Because I did reboot my system while expand process was still going, this bug might have been the cause of why I lost all the data.