You may have read of the new 4K Advanced Format drives now becoming popular on the market. In fact, if you’ve got a drive larger than 1 TB, you probably have one, even if you don’t know it. I’ve found lots of people assembling home NAS servers using 2 TB drives, linux software RAID or LVM, and all of them are concerned about aligning various parts of the storage infrastructure to the new 4K format. But, thanks to libblkid, you don’t have to.
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I recently discussed how to use LVM to make a live copy of a BackupPC pool. That guide covers how to set up LVM on a new server with no data. But what if you already have a working BackupPC install, and you want to move your existing pool to LVM?
“How do I backup my BackupPC pool” is perhaps the most common topic of discussion on the backuppc-users mailing list. BackupPC stores all files in a common compressed pool (cpool, although I’ll use simply “pool” for this discussion), and maintains trees of hardlinks into the pool for each backup host. Therefore BackupPC requires a Linux/Unix filesystem. If you want to back up the BackupPC server itself, you must duplicate the pool, and the hardlinks to it.