Second, when you pull a disk, there are multiple levels of commit that you have just broken. What guarantee do you have that the NAS wasn’t right in the middle of saving a file right when you pulled the disk? Just because you made sure all your clients were not writing anything doesn’t mean the NAS wasn’t clearing a cache or something – you simply do not know. When you do not know, you should EXPECT corruption.
Third, your file system is not cleanly dismounted. Think about it. Say for instance you want to keep a safe copy of your Windows data somewhere, and you are planning to pull the disk that is in your Windows machine. Wouldn’t you make sure you did a clean shutdown and the drive is dismounted properly before pulling out the disk? You wouldn’t just pull the power plug and kill the machine, then pull the disk right? That’s exactly what you are doing to the contents of the disk when you hot-pull a RAID1 drive.
Fourth, think of what RAID1 is all about – protection against drive failure. Now, think about how hard your drives are working during a typical day. Failure is most likely when the drive is most busy. If each day you hot-pull that disk, not only have you just walked away from redundancy until your new replacement disk is all mirrored again, you’ve also just put your drives to work – HEAVY work – remirroring. Guaranteed your disks are working waaaay harder during the re-mirror process than at any other time during the day. So just when they are most likely to fail (when they are working the hardest) you have also intentionally removed the RAID protection at this same time too – that’s just plain CRAZY!
babybob wrote:Just not sure I really see why a usb harddrive will be any better than cold swapping a disk from a mirrored raid array?
babybob wrote:thanks for all your feedback guys, I will do as suggest and test how easy it is to actual get data off the pulled drive. Thanks for the other links, the sata connectors wearing out seems another valid reason so definitely one to consider.
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