Does Ceph support iSCSI?

Does Ceph support iSCSI?

As a storage administrator, you can install and configure an iSCSI gateway for the Red Hat Ceph Storage cluster. With Ceph’s iSCSI gateway you can effectively run a fully integrated block-storage infrastructure with all features and benefits of a conventional Storage Area Network (SAN).

What is iSCSI Gateway?

The iSCSI protocol allows clients (initiators) to send SCSI commands to storage devices (targets) over a TCP/IP network, enabling clients without native Ceph client support to access Ceph block storage. These include Microsoft Windows and even BIOS.

What is OSD in Ceph?

ceph-osd is the object storage daemon for the Ceph distributed file system. It is responsible for storing objects on a local file system and providing access to them over the network. The datapath argument should be a directory on a xfs file system where the object data resides.

How do I change my iSCSI target?

Editing iSCSI Target Settings

1. Click Action, and then select Modify. The Modify iSCSI Target window opens.
2. Modify any of the following settings. Setting. Description. Target Alias. An alias enables you to identify the target more easily on the initiator. Length: 1 to 32 characters.
3. Click Apply.

How do I stop OSD Ceph?

To start, stop, or restart all the Ceph daemons, execute the following commands from the local node running the Ceph daemons, and as root :

1. Start All Ceph Daemons # systemctl start ceph.target.
2. Stop All Ceph Daemons # systemctl stop ceph.target.
3. Restart All Ceph Daemons # systemctl restart ceph.target.

What is Ceph MDS?

ceph-mds is the metadata server daemon for the Ceph distributed file system. The name is used to identify daemon instances in the ceph. conf. Once the daemon has started, the monitor cluster will normally assign it a logical rank, or put it in a standby pool to take over for another daemon that crashes.

How do I check my Ceph OSD status?

Procedure

1. To check a storage cluster’s status, execute the following: [root@mon ~]# ceph status. Or: [root@mon ~]# ceph -s.
2. In interactive mode, type status and press Enter: [root@mon ~]# ceph> status.

How do you purge a Ceph cluster?

To remove all data from /var/lib/ceph and uninstall Ceph packages, execute the purge command.

What is the iSCSI gateway?

The iSCSI Gateway presents a Highly Available (HA) iSCSI target that exports RADOS Block Device (RBD) images as SCSI disks. The iSCSI protocol allows clients (initiators) to send SCSI commands to storage devices (targets) over a TCP/IP network, enabling clients without native Ceph client support to access Ceph block storage.

How does iSCSI work with Ceph?

Each iSCSI gateway runs the Linux IO target kernel subsystem (LIO) to provide iSCSI protocol support. LIO utilizes a user-space passthrough (TCMU) to interact with Ceph’s librbd library to expose RBD images to iSCSI clients.

What are the Red Hat Ceph storage highly available iSCSI gateway requirements?

The Red Hat Ceph Storage Highly Available (HA) iSCSI gateway solution has requirements for the number of gateway nodes, memory capacity, and timer settings to detect down OSDs. Install a minimum of two iSCSI gateway nodes.

What’s new in CEPH for OpenStack?

Traditionally, block-level access to a Ceph storage cluster has been limited to QEMU and librbd, which is a key enabler for adoption within OpenStack environments. Block-level access to the Ceph storage cluster can now take advantage of the iSCSI standard to provide data storage.