VMmanager: ISCSI storage
|Hierarchy:||VMmanager KVM -> Cluster configuration|
|VMmanager Cloud -> Cluster configuration|
- VMmanager manages the server-storage through ssh
- VMmanager uses open-iscsi; all required packages should be installed, and the tgtd service must be up and running. Make sure tgtd starts automatically upon restart.
If you run Centos:
yum install scsi-target-utils service start tgtd chkconfig tgtd on
Also you need check if necessary ports are available and if not to add rules:
iptables -I INPUT 1 -p tcp --dport 3260 -j ACCEPT service iptables save
Once you have configured the storage server, go to VMmanager -> Storage templates and add an iSCSI storage.
Principles of operation
Creating a storage
While creating a VMmanager storage, a target named iqn.YYYY-MM.<hostname-reverse>.<storage>_ID, where ID - unique identifier is created on the server running iscsi.
The <storage>_ID pool is created in libvirt. Libvirt imports the target and all LUNs from that target.
Thus, the storage is a set of pools with different IDs.
Example: let's create an iscsi-storage named NetStorage.
- NetStorage_001 will be created in libvirt
- The iqn.2013-04.org.our-dc.stor1.NetStorage_001 target will be created on the server running iscsi
- The target will be added to the /etc/tgt/vmmgr/<target_name>.conf file, therefore the targets wont't be deleted upon restart. For each target separate file configuration will be created in the directory /etc/tgt/vmmgr/
The above procedure enables VMmanager to create more than 256 virtual disks on one storage. If you want to create more virtual disks, new targets NetStorage_002, NetStorage_003, etc. will be created.
Creating a virtual disk
In the iscsi-storage disks are created as files in the directory specified by the iSCSITargetDir parameter in the VMmanager configuration file, by default in /iscsivolumes
Creation of a new virtual disk includes the following steps:
- a file is created in the /iscsivolumes directory on the iscsi-server. The file has the same name as the virtual disk.
- VMmanager defines ID of the target, where LUN will be created. If the target has more than 150 LUNs, a newiqn.YYYY-MM.<hostname-reverse> target will be created .<storage>_ID, where the ID is greater by 1.
- A new libvirt pool named <storage>_ID will be created on the cluster nodes.
- A new LUN will be created in that target and added into the /etc/tgt/vmmgrtargets.conf file. Its id will be kept in the database.
- Information about the libvirt pools will be updated on all the cluster nodes (run the virsh pool-refresh <storage>_ID command)
Once completed, the newly created virtual disk will be available on all the cluster nodes. You can locate the unit:0:0:LUN_ID virtual disk in the <storage>_ID pool.
We can not identify you and respond to your message.