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John Paul Wohlscheid over at It's FOSS takes a look at the ZFS file system and its capabilities. He mainly covers OpenZFS which is the fork made since Oracle bought and shut down Solaris which was the original host of ZFS. It features pooled storage with RAID-like capabilities, copy-on-write with snapshots, data integrity verification and automatic repair, and it can handle files up to 16 exabytes in size, with file systems of up to 256 quadrillion zettabytes in size should you have enough electricity to pull that off. Because it started development under a deliberately incompatible license, ZFS cannot be directly integrated in Linux. However, several distros work around that and provide packages for it. It has been ported to FreeBSD since 2008.
(Score: 2) by pendorbound on Tuesday September 11 2018, @08:07PM
My favorite part of virtual machines on zVOL's is backups. Traditional disk image file VM's, you boot the VM and most of the whole umpteen GB group of image files is "dirty" for your next backup. With zVOL's, only the blocks your VM actually modified get backed up in the next snapshot / zfs send. There's no need to send an entire 2GB image file just because one byte in that particular slice got changed.