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<P><FONT SIZE=2>No it probably would not provide the performance unless run on 10 Gbe. Of course that depends on the number of write transactions, 1Gbe maxs around 100MB/s, so if you need faster performance look elsewhere.<BR>
<BR>
I doubt it's reliability too, nbd is a simple protocol, but as such doesn't provide for error recovery.<BR>
<BR>
Best bet, build performance storage with redundancy on 1 server, then if budget allows duplicate it on another and use something like drbd to replicate it (synchronous if network speed allows, asynchronous otherwise) for high availability.<BR>
<BR>
-Ross<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: centos-bounces@centos.org <centos-bounces@centos.org><BR>
To: CentOS mailing list <centos@centos.org><BR>
Sent: Mon Dec 17 04:56:57 2007<BR>
Subject: RE: [CentOS] Expandable network storage<BR>
<BR>
Hi all,<BR>
<BR>
I'm currently thinking about similar configurations, and (also for cost<BR>
reasons :-) am also thinking about GNBD with two standard servers as a<BR>
"poor man" redundant storage - but I'm wondering if that gives enough<BR>
performance for running databases (in my case Oracle) on top of it. The<BR>
configuration I'm thinking about would be two current Dell servers with<BR>
hardware RAID 10 and connected by a dedicated 1 GBit crossover-cable,<BR>
running both the cluster software and Oracle.<BR>
<BR>
Does anyone use this in "real-World" scenarios and has some practical<BR>
experience with it?<BR>
<BR>
Best regards,<BR>
__<BR>
/homas<BR>
<BR>
--<BR>
Thomas Bleier, DI<BR>
Information Management<BR>
Austrian Research Centers GmbH - ARC<BR>
HG Wien - FN 115980i - ATU14703506<BR>
2444 Seibersdorf, Austria<BR>
<BR>
Mobile: +43 (664) 8251279<BR>
E-Mail: thomas.bleier@arcs.ac.at<BR>
<BR>
-----Original Message-----<BR>
From: centos-bounces@centos.org [<A HREF="mailto:centos-bounces@centos.org">mailto:centos-bounces@centos.org</A>] On<BR>
Behalf Of Steve Campbell<BR>
Sent: Friday, December 14, 2007 8:52 PM<BR>
To: centos@centos.org<BR>
Subject: [CentOS] Expandable network storage<BR>
<BR>
I want to thank everyone who has provided insight into my thread about<BR>
clustering MySql. I kind of just sat back and watched it develop. I<BR>
learned a lot from it all.<BR>
<BR>
I have been reading all of the documentation on clustering provided by<BR>
Centos/Red Hat, and find I travel in circles. I read one chapter and<BR>
answer a self-imposed question but I end up asking myself another.<BR>
<BR>
What I really want to do is have HA for any service I run (which is<BR>
mostly HTTP, MySQL, FTP, and the common things like that). I want to run<BR>
<BR>
that to redundant storage somewhere that is real easy to expand by just<BR>
adding more hardware (server or disk drive).<BR>
<BR>
I started exploring this by using the Cluster Suite as a base and then<BR>
looked into each aspect of the cluster and invariably got stuck on the<BR>
storage side of this. I see how I can maybe set this up originally, but<BR>
the expansion just doesn't seem to be there. I don't really want to go<BR>
the route of Fibre channels and ISCSI, and would prefer to use common<BR>
hardware (which sort of suggests GNBD).<BR>
<BR>
If anyone cares to offer suggestions, with a pretty clear explanation<BR>
trail (thanks Ken Price for your link to a step-by-step), I would really<BR>
<BR>
like to see it, as I'm not getting anywhere with the documentation. I<BR>
hope to get some hardware to play with shortly, and maybe that'll make<BR>
things clearer.<BR>
<BR>
I'm sure it one of those deals where once I get it done, it'll be so<BR>
obvious. I just need a little kickstart to help me get there.<BR>
<BR>
Thanks,<BR>
<BR>
Steve Campbell<BR>
<BR>
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