New Cluster -- Questions
alanr at unix.sh
Thu Feb 6 13:12:18 MST 2003
Sorry I missed your email first time around.
> 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
> 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?
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
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