openstack/openstack-manuals
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Merge "[arch-design] Add descriptions for iSCSI and NFS"

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doc/arch-design/source/design-storage/design-storage-concepts.rst
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@ -229,6 +229,21 @@ Ceph's advantages include:
You should consider Ceph if you want to manage your object and block storage
within a single system, or if you want to support fast boot-from-volume.
Gluster
-------
A distributed shared file system. As of Gluster version 3.3, you
can use Gluster to consolidate your object storage and file storage
into one unified file and object storage solution, which is called
Gluster For OpenStack (GFO). GFO uses a customized version of swift
that enables Gluster to be used as the back-end storage.
The main reason to use GFO rather than swift is if you also
want to support a distributed file system, either to support shared
storage live migration or to provide it as a separate service to
your end users. If you want to manage your object and file storage
within a single system, you should consider GFO.
LVM
---
@ -249,6 +264,51 @@ Blocks are created from LVM logical volumes.
However, RAID does not protect against a failure of the entire
host.
iSCSI
-----
Internet Small Computer Systems Interface (iSCSI) is a network protocol that
operates on top of the Transport Control Protocol (TCP) for linking data
storage devices. It transports data between an iSCSI initiator on a server
and iSCSI target on a storage device.
iSCSI is suitable for cloud environments with Block Storage service to support
applications or for file sharing systems. Network connectivity can be
achieved at a lower cost compared to other storage back end technologies since
iSCSI does not require host bus adaptors (HBA) or storage-specific network
devices.
.. Add tips? iSCSI traffic on a separate network or virtual vLAN?
NFS
---
Network File System (NFS) is a file system protocol that allows a user or
administrator to mount a file system on a server. File clients can access
mounted file systems through Remote Procedure Calls (RPC).
The benefits of NFS is low implementation cost due to shared NICs and
traditional network components, and a simpler configuration and setup process.
For more information on configuring Block Storage to use NFS storage, see
`Configure an NFS storage back end
<https://docs.openstack.org/admin-guide/blockstorage-nfs-backend.html>`_ in the
OpenStack Administrator Guide.
Sheepdog
--------
Sheepdog is a userspace distributed storage system. Sheepdog scales
to several hundred nodes, and has powerful virtual disk management
features like snapshot, cloning, rollback and thin provisioning.
It is essentially an object storage system that manages disks and
aggregates the space and performance of disks linearly in hyper
scale on commodity hardware in a smart way. On top of its object store,
Sheepdog provides elastic volume service and http service.
Sheepdog does require a specific kernel version and can work
nicely with xattr-supported file systems.
ZFS
---
@ -266,42 +326,3 @@ distributions, and it has not been tested with OpenStack Block
Storage. As with LVM, ZFS does not provide replication across hosts
on its own, you need to add a replication solution on top of ZFS if
your cloud needs to be able to handle storage-node failures.
Gluster
-------
A distributed shared file system. As of Gluster version 3.3, you
can use Gluster to consolidate your object storage and file storage
into one unified file and object storage solution, which is called
Gluster For OpenStack (GFO). GFO uses a customized version of swift
that enables Gluster to be used as the back-end storage.
The main reason to use GFO rather than swift is if you also
want to support a distributed file system, either to support shared
storage live migration or to provide it as a separate service to
your end users. If you want to manage your object and file storage
within a single system, you should consider GFO.
Sheepdog
--------
Sheepdog is a userspace distributed storage system. Sheepdog scales
to several hundred nodes, and has powerful virtual disk management
features like snapshot, cloning, rollback and thin provisioning.
It is essentially an object storage system that manages disks and
aggregates the space and performance of disks linearly in hyper
scale on commodity hardware in a smart way. On top of its object store,
Sheepdog provides elastic volume service and http service.
Sheepdog does require a specific kernel version and can work
nicely with xattr-supported file systems.
NFS
---
.. TODO
ISCSI
-----
.. TODO