If you work with servers, you know you should take a backup of the server before making any change. Right? Well, servers are built for redundancy with dual power supplies, multiple network cards, and multiple hard drives to reduce downtime. Of course, your hard drives should also have redundancy. A typical scenario is to mirror the operating system drive so see one drive can fail and the system can continue to function. You can take advantage of this feature by making sure you’re A.R.M.ED!source url
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By removing one of the mirrored drives before making any changes gives you a back out in case things go wrong. You can put the drive back in once the work is complete and the drive will synchronize the changes. If things go wrong, you can remove both drives and put back the drive that was removed before the change was made and the server will come up like it did before you screwed up.