Date: Wed, 1 Oct 2014 09:08:20 +0100 (BST) From: Anton Shterenlikht <mexas@bris.ac.uk> To: allanjude@freebsd.org, m.e.sanliturk@gmail.com Cc: freebsd-hackers@freebsd.org Subject: Re: cluster FS? Message-ID: <201410010808.s9188KVc083913@mech-as221.men.bris.ac.uk> In-Reply-To: <CAOgwaMsAj5%2BoiUZEUtuc8uLHtyOm8oVdv0TUYbATm1bqdhHbWQ@mail.gmail.com>
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>From owner-freebsd-hackers@freebsd.org Wed Oct 1 03:25:08 2014 > >On Tue, Sep 30, 2014 at 9:14 PM, Allan Jude <allanjude@freebsd.org> wrote: > >> On 2014-09-30 04:45, Anton Shterenlikht wrote: >> > Hello >> > >> > Not sure if this is the right list... >> > I wanted to ask about a cluster file system. >> > Is there something like this on FreeBSD? >> > >> > It seems to me (just from reading the handbook) >> > that none of NFS, HAST or iSCSI provide this. >> > >> > My specific needs are as follows. >> > I have multiple nodes and a disk array. >> > Each node is connected by fibre to the disk array. >> > I want to have each node read/write access >> > to all disks on disk array. >> > So that if any node fails, the >> > data is still accessible >> > via the remaining nodes. >> > >> > I want to have all nodes equal, i.e. no master/slave >> > or server/client model. Also, the disk array >> > provides adequate RAID already, so that is not >> > needed either. >> > >> > In the archives I see that the demands for >> > a cluster FS support on FreeBSD have been expressed >> > periodically over a very long time, but seems >> > there's never been any resolution. >> > Some people mention GFS, but I've no idea >> > if this what I'm trying to describe. >> > >> > So is what I'm describing a cluster FS at all? >> > Is there something like this on FreeBSD already? >> > Is there someting in ports that can be used >> > to achive this? >> > >> > Thanks >> > >> > Anton >> > >> > _______________________________________________ >> > freebsd-hackers@freebsd.org mailing list >> > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> > To unsubscribe, send any mail to " >> freebsd-hackers-unsubscribe@freebsd.org" >> > >> >> What you are describing doesn't really seem to be a 'cluster' FS. >> >> In a cluster, the disks would reside in multiple machines, and the 'file >> system' would withstand any one of those machines going down. That is >> quite a bit different than just wanting a bunch of clients to have >> concurrent access to a single disk array. >> >> If you explain your use-case in more detail, we may be able to guide you >> in the right direction. >> >> -- >> Allan Jude >> >> > >The following pages and their associated pages may be useful for >definitions of terms and available capabilities : > >http://en.wikipedia.org/wiki/Parallel_Virtual_Machine >http://en.wikipedia.org/wiki/Linda_%28coordination_language%29 > >http://en.wikipedia.org/wiki/Category:Parallel_computing >http://en.wikipedia.org/wiki/Category:Concurrent_computing >http://en.wikipedia.org/wiki/Category:Distributed_computing > > >http://en.wikipedia.org/wiki/Network-attached_storage >http://en.wikipedia.org/wiki/Clustered_file_system >http://en.wikipedia.org/wiki/Category:Shared_disk_file_systems >http://en.wikipedia.org/wiki/Category:Network_file_systems > > >http://en.wikipedia.org/wiki/Ceph_%28software%29 >http://en.wikipedia.org/wiki/XtreemFS > > > >The above problem seems to be "Network-attached_storage" . Now I'm even more confused. I think what I have is called SAN. The disk array is HP MSA1000: http://www8.hp.com/h20195/v2/GetDocument.aspx?docname=c04324510 *quote* The HP StorageWorks Modular Smart Array 1000 (MSA1000) is a 2 Gb Fibre Channel storage system designed for the entry-level to mid-range Storage Area Network (SAN). *end quote* The disk array has 8-port 2 Gb Fibre Channel Fabric Switch. At present I connect 3 FreeBSD 10 nodes to the disk array via fibre. However, only one node at a time is able to mount disks. What I'm looking for is the solution to be able to mount the disks on the disk array for read/write access from all nodes, up to 8. So that if a node fails, the data is still accessible via the other nodes. The model that I'm describing is a VMS cluster model. I'm not sure if it makes sense for FreeBSD. Thanks Anton
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