[NTLUG:Discuss] High Availability Storage Solution

[George Lass]

Neil,
Thanks for the link.  A quick read of manual seems to indicate
that I would need to invoke it on a periodic basis to keep my
file systems in sync (unless I missed something).  I'm going
to need something more real time than that.
George





----- Original Message ----
From: Neil Aggarwal <neil at JAMMConsulting.com>
To: NTLUG Discussion List <discuss at ntlug.org>
Sent: Wed, March 2, 2011 1:03:25 PM
Subject: Re: [NTLUG:Discuss] High Availability Storage Solution

George:

Take a look at Unison:
http://www.cis.upenn.edu/~bcpierce/unison/ 

I am using it to keep a file system synced 
on two geographically separated machines.
Users are able to make changes on either machine
since Unison is bi-directional.

It has been working very well for years.

    Neil

--
Neil Aggarwal, (281)846-8957, http://UnmeteredVPS.net/centos
Virtual private server with CentOS 5.5 preinstalled
Unmetered bandwidth = no overage charges 

-----Original Message-----
From: discuss-bounces at ntlug.org [mailto:discuss-bounces at ntlug.org] On Behalf
Of George Lass
Sent: Wednesday, March 02, 2011 12:30 PM
To: discuss at ntlug.org
Subject: [NTLUG:Discuss] High Availability Storage Solution

Greetings,

I am trying to figure out an inexpensive storage solution to support the
needs
of 2 different high availability clusters.  One of the HA clusters will be 
running
Suse Enterprise Linux 11, and the other CentOS 5.x. I have been reading up
on CentOS clustering, and GFS and GNBD with directly connected storage:

http://www.centos.org/docs/5/html/5.2/Cluster_Suite_Overview/s2-ov-economy-C
SO.html#fig-gfs-gnbd-storage-CSO



and it might fit the bill, but I'm unclear what would happen if one if the
GNBD 
servers
fails and I no longer have access to its local disk.  In particular, I'm 
wondering
if data written to one of the GNBD servers is "mirrored" to the other
servers so
that all of my application data is still accessible?

Does anyone out there have any experience with this kind of set up, or know
of a storage solution that would fit my needs?

Thanks,

George Lass


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