Volumes can be useful to run other filesystems on top of ZFS, or to export iSCSI extents. It provides some of the features that datasets have, but not all. Volume is the brother of datasets but in a block device representation. Here you can define user access, quotas, compression, snapshots, etc… Volume This allows you to mix vdev types together to achieve other RAIDZ levels (see example below):ĭataset is the filesystem part of ZFS (so far we’ve seen the LVM components). You create/define your vdevs when you create a pool (with the zpool command which we’ll see later). PoolĪ pool is composed of one or more vdevs and they usually contain a volume or a dataset (which you create after creating the pool). 💡 TIP: There are 7 different types of vdevs, and some of them (like host spare, L2ARC and ZIL) are very important. They can be combined together in mirrors or RAIDZs.
ZFS ComponentsĪ vdev is composed of one or more physical drives (can also be of things other than hard drive, like files).
#Openzfs mountpoint not empty code
Because the source code was already in the open and ported to different OSs, eventually a project called ‘OpenZFS’ was created, and that is the core code that is used on most Unix like systems today (Linux, FreeBSD, etc.). ZFS was published under an open source license until Oracle bought Sun Microsystems and closed source the license. ZFS is a local filesystem (i.e.: ext4, NTFS, exfat) and logical volume manager (i.e.: LVM on Linux) created by Sun Microsystems. Please keep in mind that I don’t consider myself an expert on ZFS (not even close), but I will try to make things simple and easy to understand for someone, who like me, is just getting started with ZFS. And I’m happy to share some of the knowledge that I gathered with you on this post. This was a great opportunity for me to learn more about ZFS (because I new ‘nada’ to start with).
#Openzfs mountpoint not empty how to
Because of that, not only was I forced to learn how to troubleshoot ZFS, but I also had to learn how to setup new volumes and come up with new backup strategies (between a few other things). As mentioned on previous posts, I have spent the past few weeks dealing with a ZFS crash on my FreeNAS install.
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