tested on Slackware 14.2 and current
We don’t need CLVM nor lvmlockd/sanlock/dlm because:
Dual-primary is only required temporarily during XEN migration. With it disabled, the replicated vdisk does not come up as primary by itself, and remains in secondary state unless manually told to.
either from source
slackpkg install autoconf expat libaio boost zstd gcc-g++ git clone https://github.com/jthornber/thin-provisioning-tools.git cd thin-provisioning-tools/ autoconf ./configure make clean make -j8 make install
or as binary package
slackpkg install thin-provisioning-tools
check
which thin_check thin_check -h
make partition type Linux LVM available and check its resulting size
#partprobe #partx -u /dev/sda pvcreate /dev/sdb pvs
then proceed with a thin pool and an LV creation
vgcreate vdisks /dev/sdb lvcreate -l 100%FREE --thin vdisks/thinpool lvcreate -V 5G --thin vdisks/thinpool -n slack ls -lF /dev/vdisks/slack
The design we’re attempting to PoC here is as such:
/data/ as GFS2 for XEN guest configurations/dev/vdisks/LV-HERE logical volumes for XEN guest vdiskson both nodes
mv -i /etc/drbd.conf /etc/drbd.conf.dist
vi /etc/drbd.conf
global {
usage-count yes;
udev-always-use-vnr;
}
common {
net {
protocol C;
fencing resource-only;
allow-two-primaries yes;
}
disk {
read-balancing when-congested-remote;
}
}
resource res-data {
device /dev/drbd0;
meta-disk internal;
on node1 {
disk /dev/sda3;
address x.x.x.x:7700;
}
on node2 {
disk /dev/sda3;
address x.x.x.x:7700;
}
}
resource res-slack {
device /dev/drbd1;
meta-disk internal;
on node1 {
disk /dev/vdisks/slack;
address x.x.x.x:7701;
}
on node2 {
disk /dev/vdisks/slack;
address x.x.x.x:7701;
}
}
scp /etc/drbd.conf node2:/etc/drbd.conf
modprobe drbd
modprobe drbd_transport_tcp
drbdadm down all
#dd if=/dev/zero of=/dev/... bs=1M count=1
drbdadm create-md all
drbdadm up all
node1
drbdadm primary --force res-data drbdadm primary --force res-slack
all nodes
drbdadm status ls -lF /dev/sda4 /dev/vdisks/slack /dev/drbd1 fdisk -l /dev/sda4 /dev/vdisks/slack /dev/drbd1
–> 1 073 741 824 vs 1 073 672 192 bytes hence 69632 difference
vi /etc/rc.d/rc.local /sbin/modprobe drbd /sbin/modprobe drbd_transport_tcp /bin/lsmod | grep drbd #/usr/local/sbin/drbdadm up all /etc/init.d/drbd start vi /etc/rc.d/rc.local_shutdown #/usr/local/sbin/drbdadm down all /etc/init.d/drbd stop /sbin/rmmod drbd_transport_tcp /sbin/rmmod drbd
all nodes
/usr/local/sbin/drbdadm status
and check that the replicated volumes are brought up at startup
reboot
vgchange -an vdisks dd if=/dev/zero of=/dev/sda2 bs=1M count=1
5.4.4. Creating Thinly-Provisioned Logical Volumes https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/logical_volume_manager_administration/thinly_provisioned_volume_creation
How to setup thin Provisioned Logical Volumes in CentOS 7 / RHEL 7 https://www.linuxtechi.com/thin-provisioned-logical-volumes-centos-7-rhel-7/
Thin Provisioning in LVM2 https://www.theurbanpenguin.com/thin-provisioning-lvm2/
Setup Thin Provisioning Volumes in Logical Volume Management (LVM) – Part IV https://www.tecmint.com/setup-thin-provisioning-volumes-in-lvm/
[linux-lvm] lvmlockd: how to convert lock_type from sanlock to dlm? https://www.redhat.com/archives/linux-lvm/2017-November/msg00018.html https://linux-lvm.redhat.narkive.com/wRZahcsN/lvmlockd-how-to-convert-lock-type-from-sanlock-to-dlm
[linux-lvm] The benefits of lvmlockd over clvmd? https://www.redhat.com/archives/linux-lvm/2018-January/msg00018.html
PVE 6.x Cluster Setup of shared LVM/LV with MSA2040 SAS [partial howto] https://forum.proxmox.com/threads/pve-6-x-cluster-setup-of-shared-lvm-lv-with-msa2040-sas-partial-howto.57536/
2.4. The Clustered Logical Volume Manager (CLVM) https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/logical_volume_manager_administration/lvm_cluster_overview