2009/1/23 mohan L
<l.mohanphy@xxxxxxxxx> Dear All ,
I am trying to design high available and cluster set up for my benchmarking .Today I read some design information available in GlusterFS home page .
http://www.gluster.org/docs/index.php/Simple_High_Availability_Storage_with_GlusterFS_2.0#Larger_storage_using_Unify_.2B_AFR
It is configured using 6 server single client .server 1 and server 2 has two directory /export and /export-ns .
volume brick1
type protocol/client
option transport-type tcp
option remote-host 192.168.1.1 # IP address of the remote brick
option remote-subvolume brick # name of the remote volume
end-volume
From this I understand that
It will mount the server1(192.168.1.1) exported directory to client machine mount point
volume brick2
type protocol/client
option transport-type tcp
option remote-host 192.168.1.2
option remote-subvolume brick
end-volume
It will mount the server2 (192.168.1.2) exported directory to client machine mount point
volume brick3
type protocol/client
option transport-type tcp
option remote-host 192.168.1.3
option remote-subvolume brick
end-volume
It will mount the server3 (192.168.1.3) exported directory to client machine mount point
volume brick4
type protocol/client
option transport-type tcp
option remote-host 192.168.1.4
option remote-subvolume brick
end-volume
It will mount the server4 (192.168.1.4) exported directory to client machine mount point
volume brick5
type protocol/client
option transport-type tcp
option remote-host 192.168.1.5
option remote-subvolume brick
end-volume
It will mount the server5 (192.168.1.5) exported directory to client machine mount point
volume brick6
type protocol/client
option transport-type tcp
option remote-host 192.168.1.6
option remote-subvolume brick
end-volume
It will mount the server6 (192.168.1.6) exported directory to client machine mount point
volume brick-ns1
type protocol/client
option transport-type tcp
option remote-host 192.168.1.1
option remote-subvolume brick-ns # Note the different remote volume name.
end-volume
It will mount the server1(192.168.1.1) exported directory (/home/export-ns/
) to client machine mount point
volume brick-ns2
type protocol/client
option transport-type tcp
option remote-host 192.168.1.2
option remote-subvolume brick-ns # Note the different remote volume name.
end-volume
It will mount the server2(192.168.1.2) exported directory (/home/export-ns/
) to client machine mount point
volume afr1
type cluster/afr
subvolumes brick1 brick4
end-volume
Here brick1 replicates all files to brick4 ,Is it correct?
yes.
volume afr2
type cluster/afr
subvolumes brick2 brick5
end-volume
volume afr3
type cluster/afr
subvolumes brick3 brick6
end-volume
volume afr-ns
type cluster/afr
subvolumes brick-ns1 brick-ns2
end-volume
Here the namespace information are replicating .Is it correc?
volume unify
type cluster/unify
option namespace afr-ns
option scheduler rr
subvolumes afr1 afr2 afr3
end-volume
what actuly unify does here?
unify is used to aggregate the contents of afr1, afr2 and afr3. Say following is the list of files on afr1, afr2 and afr3,
afr1: file-1
afr2: file-2
afr3: file-3
then using unify to aggregate all the three afr subvolumes results in a filesystem containing all the three files.
unify (of afr1, afr2, afr3): file-1, file-2, file-3.
what is the meaning of namespace in GlusterFS?
namespace is just a cache, which holds the directory tree of unify. Please note that the files contained in this directory tree are of zero byte sized.
what about storage scalibality in this design? both server and client. can you please give one example ?
only bottleneck in scalability is the namespace node. It should be able to hold the entire directory structure of unify (with zero byte sized files). Other than that, a new node can be added just by changing the configuration file and remounting glusterfs.
how can do HA +unify design with multiply server with multiple client?for example 8 server two client .
If replication is not needed, each of the client can have unify of all the volumes exported by servers.
volume unify
type cluster/unify
subvolumes ha1, ha2..... ha8.
end-volume
and ha1, ha2.. ha8 provide High availability using multiple links to the same server.
say,
volume ha1
type cluster/ha
subvolumes client-1a, client-1b
end-volume
where client-1a and client-1b are two different links to server1.
regards,
any one please help me to understand those and correct me .
Thanks for your time
L. Mohan
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