... but less than 100% reliable, though. See this - http://www.technibble.com/forums/showthread.php?t=24345 . Given that you can literally burn the laptop in fire, and still recover all the significant data, why would anyone bother with backups at all? Disclaimer: just kidding
For reference, we were using QNAP TS-639 Pro with six WD20EADS disks. After about half a year of use, the web-interface was running slower, so that we needed to wait for several minutes to obtain the list of the disks. Gradually, we noted that the array performance decreased significantly. It seemed obvious to assume that one of the member disks has been dropped from the array and a RAID5 was working in the degraded mode. However, all the member disks were marked as GOOD in the web-interface. It was suspicious that LEDs on the disk bays indicating the state and activity of the disks were blinking unevenly. Logically, for RAID5 one should expect almost symmetric load on the disks, but in fact, one of the disk LED was blinking much more frequently. Once we had run the bad blocks check on this disk through the web-interface, the disk dropped from the array in less than half an hour and its bay LED turned red. At this point, the web-interface began to work properly again. The disk taken fr
Based on this MS blog post , once you lost a storage space configuration, it is just lost. At the moment, there is a significant difficulty recovering JBODs automatically. What the Storage Spaces subsystem does is, in effect, creation of JBODs of 256MB blocks. So in the end you can have just a plain JBOD, RAID 1 over JBODs, or RAID 5 over JBOD configuration. The capability to put 256MB blocks back into the pool and then use them again as needed, probably for another volume, leads to fragmentation on the pool level. That is, the volume itself gets fragmented, and obvously alignment gets out of window. This means no RAID recovery on Storage Spaces unless some significant breakthroughs are made. Even simple volumes will not be recoverable if they got fragmented.
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