Hi all me and Paolo developed a new Transfer Manager driver in order to add support for LVM on a shared storage repository. Please consider this driver is in a very early development stage, so it is not guaranteed it works for all possible configurations. Another important thing is that, because this driver uses LVM without the clustering extensions, it may be possible to experience LVM metadata corruption (however, this never happened in our test cloud).
This driver requires:
- iSCSI target on one node (IMPORTANT!! Add this option: write-cache off);
- iSCSI initiators on all nodes (frontend + other cluster nodes);
- LVM with file-based locking enabled.
Steps required to enable the driver:
1) Edit the configuration file /etc/lvm/lvm.conf in the host that exports
the device and set the "filter" parameter by replacing the involved line
with:
filter = [ "r|<exported device>|" ]
This is required in order to prevent LVM to access the exported device
without
passing from the iSCSI interface.
2) Extract the content of the attached tarball to $ONE_LOCATION;
3) Set the LVM volume group name in the file
$ONE_LOCATION/etc/tm_sharedlvm/tm_lvmrc
by editing the variable VG_NAME;
4) Add these lines to the configuration file $ONE_LOCATION/etc/oned.conf:
TM_MAD = [
name = "tm_sharedlvm",
executable = "one_tm",
arguments = "tm_sharedlvm/tm_lvm.conf" ]
5) Remove all cluster nodes added with the "onehost" utility;
6) Re-add all cluster nodes to the cloud by executing:
onehost create <cluster node name> <virt driver> <inf driver> tm_sharedlvm
6) Enjoy it!
Regards
Roberto Sassu
Paolo Smiraglia
tm_sharedlvm.tar.bz2
Description: application/bzip-compressed-tar
smime.p7s
Description: S/MIME cryptographic signature
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