I am running UnRaid 3, and noticed that once one of my hard disks had reached approx 75% capacity, all future data which I tried to add to it was corrupted.

 

Yesterday, when trying to delete all data on the drive, some 100Gb, it would get half way through and then freeze, on checking I found that Unraid decided to reboot. Once it had done this, it decided to carry out a parity check. Feeling fed up, I stopped the check and deleted the remainder of the data on the drive and started a parity check, upon which I was informed that the drive was unformatted!!! I therefore formatted the drive (I had deleted the data anyway), and now once again the system is carrying out a parity check. I will check for loose/bad data and power connections to the drive, but does this sound like a defective drive (it is some 3 years old, and was previously used 24/7 in a Raid 5 server)?

 

Also I am running 4No. 200Gb disks and 2No. 400Gb disks (including parity drive), all IDE, connected to Promise cards. The fastest that parity check runs is 3000KB/sec, which takes some time (400Gb parity drive). Processor is 2400+ Sempron with 512Mb of memory, is this correct? 

Yes, check cabling and be sure to use a high quality power supply.

 

The parity check speed is slow.  Either one or more disks are not in DMA mode and/or errors are occurring.

Thanks for reply, how do I check if disk are running in DMA mode, and if not, how do I change from PIO mode to DMA?

 

I am using a 430W Enermax power supply, and will recheck all cabling / connectors etc

I have checked the Promise card BIOS on startup and all drives are reported as running Ultra DMA

 

I have now order some high quality IDE cables and give these a go