Re: multiple attached storage

Andreas Buschmann <buschman@xxxxxxxxx> wrote:
1) What I want to do is to have one filesystem mounted on both servers,
which is accessed by both servers in parallel.

That's a specialty product. Most filesystems (UFS, VxFS, ZFS) don't
support that. Some that do are:

Sun QFS
Veritas Cluster Filesystem (probably needs cluster volume manager, too)
ADIC StorNEXT

I want to have two (nearly) identical servers, so I can disconnect
one of them for a software / hardware upgrade.

How do I atach the storage array on the filesystem side?

The salesman told me something, but was not very helpful on the
software side.
I do not know which product I need, and I do not know the right
words for what I want.

For the application I do not need a cluster in the "single system
image" meaning (as described by Pfinster).

I would very much like having an extra IP Address, which moves
between the servers, but this could be done by the loadbalancer.

Most HA/cluster solutions can manage that. If you have a single IP that
moves between the servers, could you move the filesystem between them
too? The simultaneous mount is the hard part. If it was only mounted
on one at a time, then the need for the special filesystem is gone.

2) Alternatively I could use one of the V240 with internal disks or
an external array as an NFS Fileserver.

That's a common way to do it.

But, when I configured CacheFS on the second T2000 it told me,
that CacheFS and NFSv4 do not work with each other.

I think that's because v4 introduces its own protocol for allowing the
application to access and control some of the caching parameters.

--
Darren Dunham ddunham@xxxxxxxx
Senior Technical Consultant TAOS http://www.taos.com/
Got some Dr Pepper? San Francisco, CA bay area
< This line left intentionally blank to confuse you. >
.

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