Re: High Availability

Michael Groves wrote:
I want to build a High availability file server(s)

I tried Windows DFS (Distributed File System), great idea, but just like
most windows products it's very unreliable.
The DFS servers basically replicate each others files, to keep the latest
files on each server. If one server goes down you are automatically directed
to another server. Its good because I don't need to purchase a costly SAN, I
just use old servers.

Does SLES High Availability server do the same job, if not is there
something else I could use?

SUSE uses ocfs2 for a clustered file system. We haven't done a lot
of testing... mostly in load balanced scenarios.. but so far it
seems to be working ok... (using SLES9 SP2).

There ARE inexpensive SAN devices that work VERY well.

In our case the shared disk is a virtual disk. The clustered
nodes are both virtual machines on VMware ESX server. Again..
this is test scenario for us... we'd probably go with
a shared drive on a SAN in real life.

I just bought a 2.8TB SAN at my house for less than $2K (ebay
is your friend). $1K/TB is certainly doable.. just have
to be on the lookout (I'll admit, the deal I got was
pretty exceptional.. btw... TWO units sold that day for
less than $2K).

If you like a more home grown approach, you can use the
remote block device support along with a heartbeat and
IP switchover (forget the names)... it also involves
rsync to bring the failed node back into play... a
few gotchas in the process.
.

Relevant Pages

  • NetSec Security Advisory: Multiple Vulnerabilities Resulting From Use Of Apple OSX HFS+
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