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[parscott]

Yesterday I installed my brand new DNS-323 with 2 X 2TB Seagate drives (HD-ST32000542AS) and configured all the space to be Raid 1 (mirror) as data loss was my concern. I set auto-recovery on. All was good and I was in the middle of moving over about 100 GB of data when we had a neighbourhood power outage. Oh well I thought, I have a mirrored NAS but after I powering it up and waited a few mintues , to my surprise Volume_1 was empty! WTF?  All data was gone. The system configuration (user/groups etc) was ok. The logs didn't indicate a rebuild so what happened?
I have firmware 1.8.

[fordem]

Welcome to the wonderful world of RAID, and all the misconceptions that surround it.

If data loss is your concern, what you need is a good backup of your data, RAID1 is for those of us whose concern is availability of the data.  RAID1 will not protect you from loss of data caused by anything other than a failed disk, so data loss caused by accidental (or deliberate) deletion of files, corruption due to viruses, power outages, network failures, etc can and may still occur.

Your data MAY still be on the drive, but, the pointers that indicate where it is, and which blocks have been used, probably had not been written (or were corrupted) when the power failed.