Storage Model, Ceph vs GlusterFS

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We have not been able to come up with a Hi all, I have installed the Gluster 1. All nodes in a GFS cluster function as peers. Поэтому все новое они обычно покупают - для того и существуют стартапы.

I haven't come across it yet. It supports several backends Docker, Swarm, Kubernetes, Marathon, Mesos, Consul, Etcd, Zookeeper, BoltDB, Eureka, Amazon DynamoDB, Rest API, file… to manage its configuration automatically and dynamically.

Storage Model, Ceph vs GlusterFS - Получить сотню тысяч евро отката, обычно того не стоит, а вот за миллиард уже можно подумать.

For the general concept, see. In , the Global File System 2 or GFS2 is a for. GFS2 differs from such as , , , or because GFS2 allows all nodes to have direct concurrent access to the same shared. In addition, GFS or GFS2 can also be used as a local filesystem. GFS2 Full name Global File System 2 Introduced 2005 with 2. All nodes in a GFS cluster function as peers. Using GFS in a cluster requires to allow access to the shared storage, and a lock manager to control access to the storage. Older versions of GFS also support GULM, a server-based lock manager which implements redundancy via failover. GFS and GFS2 are , distributed under the terms of the. Development of GFS began in 1995 and was originally developed by professor Matthew O'Keefe and a group of students. It was originally written for 's operating system, but in 1998 it was ported to since the code provided a more convenient development platform. In 2001, Sistina made the choice to make GFS a proprietary product. Developers forked OpenGFS from the last public release of GFS and then further enhanced it to include updates allowing it to work with OpenDLM. But OpenGFS and OpenDLM became defunct, since purchased Sistina in December 2003 and released GFS and many cluster-infrastructure pieces under the in late June 2004. A further development, GFS2 derives from GFS and was included along with its shared with GFS in Linux 2. Red Hat Enterprise Linux 5. As of 2009 , GFS forms part of the , 5. Users can purchase to run GFS fully supported on top of. Although it is possible to use them as a single node filesystem, the full feature-set requires a SAN. This can take the form of , , , or any other device which can be presented under as a block device shared by a number of nodes, for example a device. The requires an based network over which to communicate. This is normally just , but again, there are many other possible solutions. The GFS requires hardware of some kind. The usual options include power switches and remote access controllers e. It can also optionally restart the failed node automatically once the recovery is complete. Some of these are due to the existing filesystem interfaces not allowing the passing of information relating to the cluster. Some stem from the difficulty of implementing those features efficiently in a clustered manner. Since this is a cluster filesystem, that PID might refer to a process on any of the nodes which have the filesystem mounted. Since the purpose of this interface is to allow a signal to be sent to the blocking process, this is no longer possible. Each on the filesystem has two glocks associated with it. One called the iopen glock keeps track of which processes have the open. The other the glock controls the cache relating to that. A glock has four states, UN unlocked , SH shared — a read lock , DF deferred — a read lock incompatible with SH and EX exclusive. Each of the four modes maps directly to a lock mode. In SH mode, the inode can cache data and , but it must not be dirty. In DF mode, the is allowed to cache only, and again it must not be dirty. In UN mode, the must not cache any. In order that operations which change an 's data or do not interfere with each other, an EX lock is used. Of course, doing these operations from multiple nodes will work as expected, but due to the requirement to flush caches frequently, it will not be very efficient. The solution is to break up the mail spool into separate directories and to try to keep so far as is possible each node reading and writing to a private set of directories. GFS and GFS2 are both ; and GFS2 supports a similar set of journaling modes as. This is the only mode supported by GFS, however it is possible to turn on journaling on individual data-files, but only when they are of zero size. Journaled files in GFS have a number of restrictions placed upon them, such as no support for the mmap or sendfile system calls, they also use a different on-disk format from regular files. This ensures that blocks which have been added to an inode will have their content synced back to disk before the metadata is updated to record the new size and thus prevents uninitialised blocks appearing in a file under node failure conditions. GFS2 also relaxes the restrictions on when a file may have its journaled attribute changed to any time that the file is not open also the same as. For performance reasons, each node in GFS and GFS2 has its own journal. In GFS the journals are disk extents, in GFS2 the journals are just regular files. The number of nodes which may mount the filesystem at any one time is limited by the number of available journals. GFS2 adds a number of new features which are not in GFS. Configurable from kernel 2. To this end, most of the on-disk structure has remained the same as GFS, including the byte ordering. Most of the data remains in place. The GFS2 utilities and unmount the meta filesystem as required, behind the scenes. IEEE Transactions on Parallel and Distributed Systems. Archived from PDF on 2004-04-15. Proceedings of the Linux Symposium 2007. Proceedings of the Linux Symposium 2009.
Reason for trying GlusterFS comparing to GFS2 is simplicity, GFS2 requires RH cluster installation while GlusterFS not. This is a classic scale-out use case, and IMO GlusterFS should fit the bill. Также мы склоняемся к разработкам от Red Hat. Archived from PDF on 2004-04-15. Я на ресурсах IBM ничего про это не нашёл, написал одному из их представителей в России. Про файл нашёл, про раздел — нет, так что ссылки приветствуются. Для MooseFS я вообще не нашёл информацию о поддержке страйпа файловых блоков, так что, скорее всего, вы получите хорошее масштабирование размера, но не скорости.