On Mon, 2013-09-09 at 13:50 +1000, Tudor Holton wrote: > Completely anecdotal evidence, but I was mixing WD Reds and Seagates in > a QNAP RAID 6 each 3TB for a total of 6TB, and the Seagates kept making > sounds like they were about to hurl. Testing each drive individually > with badblocks and smart came up with all drives OK. But it kept > chucking the WDs one by one. Eventually I removed the Seagates and > replaced them with WDs and since then no drives have been thrown out. > > I can only theorise that there may be a timing issue between WD Reds and > Seagate. I wonder if the vibrations of the Seagates was causing the reds to be thrown? >From what I've read (assuming I understand correctly) they are a low-ish vibration drive with some fancy head positioning for alignment... but should be limited to 5 at most, or at least are intended for upto 5 drive systems, so I wonder if this means that more than 5 could suffer from vibrations throwing disks out? All that said, I wonder just how sensitive drives are nowadays? While I have heard of tales of old where someone sneezing in the computer room would cause large raid clusters to pop I don't know how true they are or how sensitive drives are to the accumulative vibrations of many disks or if its more of a case that as the number of disks increases then the statistical chance of a drive failing increases to the point that it is more likely to happen in coincidence with an external event, such as a sneeze. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
