[NTLUG:Discuss] High Availability Storage Solution

[George Lass]

Dennis,
I have decided to use DRBD to keep my servers in sync.  Since my servers
are geographically co located, I'm using a cross over Ethernet cable between
the 2 boxes for equalization, but You could use any network path between
your servers to accomplish the same thing.
George
  




----- Original Message ----
From: Dennis Myhand <dmyhand at suddenlink.net>
To: NTLUG Discussion List <discuss at ntlug.org>
Sent: Fri, April 29, 2011 10:28:12 PM
Subject: Re: [NTLUG:Discuss] High Availability Storage Solution

Sorry I have not entered in to this before.  George, couldn't you set up 
a cron job to invoke Unison at some time when the users are not logged 
into the system?  I am beginning to look at what it will take to build a 
high availability device of my own and I am going to need it to have 
some way to sync files over a distance of one to three kilometers.

On 3/2/2011 1:29 PM, George Lass wrote:
> 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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