In testing out various ways to achieve disk compression on our PostgreSQL servers, I ended up with a server build with a version of ZFS newer that the package distribution. Which means I needed to recreate the pool to use an older version of ZFS that would be updated as part of the routine patching. Beyond backing up and restoring the data …

# Get rid of existing pool

zpool export pgpool
zpool destroy pgpool
zpool list # this still shows a pool on sdb

# Clear the label

zpool labelclear /dev/sdb

# Didn’t work, so blow away everything on sdb

dd if=/dev/zero of=/dev/sdb bs=1M count=10
wipefs -a /dev/sdb

# Uninstall custom built zfs

cd /root/zfs
make uninstall

Install new ZFS

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
yum install kernel-devel

yum install https://zfsonlinux.org/epel/zfs-release-2-3$(rpm –eval “%{dist}”).noarch.rpm
dnf config-manager –disable zfs
dnf config-manager –enable zfs-kmod
yum install zfs

# Sign kernel modules

/usr/src/kernels/$(uname -r)/scripts/sign-file sha256 /root/signing/MOK.priv /root/signing/MOK.der /lib/modules/$(uname -r)/extras/zfs/avl/zavl.ko
…
/usr/src/kernels/$(uname -r)/scripts/sign-file sha256 /root/signing/MOK.priv /root/signing/MOK.der /lib/modules/$(uname -r)/extras/zfs/zfs/zfs.ko

# Reboot

init 6

# And start over — recreate the pool

zpool create pgpool sdb
zfs create pgpool/pgdata
zfs set compression=lz4 pgpool/pgdata
df -h /pgpool/pgdata/