As Linux Administrators, it is inevitable that we will get a request to grow an existing filesystem for one reason or another. The lazy administrator will take the easy way out and attach a secondary disk to the server, pvcreate it, and add the extra extents to the existing logical volume. This is actually a fairly safe way to do it, it can be done online, and the end result is the same for the user. That makes it a really appealing prospect to do things this way, but it is really dirty, and what do you do if that second (or third, or fourth, …) disk in volume group fails? Then you’re screwed. Continue reading »

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