In this tutorial we’re going to create a ZFS filesystem on Disk1 and then extend it to Disk2. We’re not going to worry about redundancy because this is a tutorial but ZFS does support common RAID types. We’ll configure ZFS for RAID0 (no parity, no redundancy). In the real world, you’d almost certainly use a RAID with redundancy unless your joining disks from a SAN perhaps.
This tutorial is for Redhat or CentOS 7.x.
yum upgrade yum localinstall --nogpgcheck https://download.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm yum localinstall --nogpgcheck http://archive.zfsonlinux.org/epel/zfs-release.el7.noarch.rpm yum install zfs
List your current ZFS filesystems. I don’t have any so none appear in the results:
zfs list
If you have problems with modules at this point, try running “yum install kernel*”. Otherwise the “yum upgrade” at the top of this tutorial should help. You may need to reboot to load the new kernel after an upgrade.
Let’s create the first ZFS filesystem where “/dev/sdb” is your first ZFS disk:
zpool create -f zfs_volume /dev/sdb
TIP: You can use create these kinds of RAID:
# RAID0 - striped zpool create -f zfs_volume /dev/sdb /dev/sdc /dev/sdd # RAID1 - mirror zpool create mirror -f zfs_volume /dev/sdb /dev/sdc # RAID5 - striped with parity zpool create raidz -f zfs_volume /dev/sdb /dev/sdc /dev/sdd # RAID6 - striped with two parity zpool create raidz2 -f zfs_volume /dev/sdb /dev/sdc /dev/sdd /dev/sde # RAID10 - striped over mirror zpool create mirror -f zfs_volume /dev/sdb /dev/sdc zpool add mirror -f zfs_volume /dev/sdd /dev/sde
It should have mounted for you. And check that it worked:
zfs list df -h
And expand it over the second disk where “/dev/sdc” is your second ZFS disk:
zpool add -f zfs_volume /dev/sdc
And confirm it worked:
zfs list df -h
References:
http://zfsonlinux.org/epel.html