New Cluster -- Questions

[Alan Robertson]

Hi Rob,

Sorry I missed your email first time around.

Rob wrote:
> Hello all.
> 
> I have contacted Alan about my configuration and applied his 
> suggestions.  I have a few questions so let me start by explaining my 
> configuration:
> 
> 2) Dell 2500 2x1Ghz/1GB/2x18GB on Perc5(?) RAID
>  > eth0 -> public TCP/IP interface (100Mb FD)
>  > eth1 -> (heartbeat) point to point TCP/IP on both boxes (100Mb FD)
>  > eth2 -> (drbd sync) point to point TCP/IP on both boxes (100Mb FD)
>  > ttyS0 -> (heartbeat) point to point Null RS-232
>  > ttyS1 -> (stonith) connections to alternate node's APC1400 UPS
> 
> 2) APC 1400 UPS's cross connected with APC serial cables to ttyS1
> 
> At Alan's suggestion, I will be setting up a 2 node cluster with drbd 
> mirroring two slices, one for HTTP and one for MySQL.  The hardware is 
> all set up and tested. 

This all sounds fine.

> 
> My Questions:
> 
>  >>  How will drbd perform on a 100MB connection?

I would expect it to run at least half the bandwidth when keeping up with 
writes.  That would mean 50mbit/sec => 6 mbyte/sec

 > I am proposing 1Gb
> NIC's but have to wait for approval and purchase.
>  >>  I downloaded 3 seperate heartbeat packages from the site, 
> heartbeat-0.4.9.2-1, heartbeat-ldirectord-0.4.9.2-1, 
> heartbeat-stonith-0.4.9.2-1 ---  Which do I need?  I am going to use 
> STONITH but don't know if I need the other packages as well

I'd suggest installing the beta version.  It has a few more packages (so 
it's more confusinig).  You don't need ldirectord.  The rest you need.

>  >>  What stumbling blocks should I know ahead of time to watch out for?

Dunno...

If your MySQL (or httpd) init script doesn't print "OK" or "running" when 
you give it a status operation, that could cause confusion.  Ditto if it 
prints OK or running when it's stopped.  Printing "not running"  or "not OK" 
doesn't count ;-)

-- 
     Alan Robertson <alanr at unix.sh>

"Openness is the foundation and preservative of friendship....  Let me claim 
from you at all times your undisguised opinions." - William Wilberforce