[Gluster-users] glusterfs alternative ? :P

[Stas Oskin]

Hi.


> I will try. Shared block storage is a block device like /dev/sda
> accessible on more than one server at once. This may be a plain hard-disk
> or a hardware RAID. Coordination among the servers is handled on the file
> system level above that - for example by OCFS or GFS. Using a normal file
> system like Ext3 is not possible for read/write operations to the same
> shared block storage since the servers would get very confused.
>

Thanks for the info.


> As far as I know; Lustre in itself do not handle redundancy or fault
> tolerance. In order to get redundancy for Lustre (unlike GlusterFS or
> Ceph) that must be handled by some kind of shared storage. And Lustre
> needs the data to be stored on a block device.
>
> Using shared block storage to keep the data on (usually a hardware RAID on
> a SAN) makes it to move the service from one physical server to another.
>
> Example: normally one server is taking care of service A and another
> server is taking care of service B. The first server is also passively
> taking care of service B and the other server passively taking care of
> service A. When the first server goes down the other server is taking over
> service A, which means both A and B are located on the same server.
>

So basically the data stored on 2 nodes, but their coordination requires a
shared block device? Because they do seem to speak about specific storage
nodes - but I might not understand this correctly.

Regards.
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