Clustering solution for RH Linux AS and Solaris x86/AMD 64 Post: 64606

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Top Forums UNIX for Advanced & Expert Users Clustering solution for RH Linux AS and Solaris x86/AMD 64 Post 64606 by TioTony on Tuesday 1st of March 2005 11:54:53 PM

03-02-2005

Registered User

Hi Izzy,
I have various levels of experience with Sun Cluster, Veritas Cluster, HACMP (IBM), Red Hat AS clusters, Tru64 clusters, and SuSe clusters.
My personal opinion (please don't turn this into an OS vs. OS string) is Sun is dying and linux is rising. That being said it may still not be time for you to jump ship yet.
Wait until RH releases the Cluster Suite and GFS for RHAS 4.0 then get a copy to play with. RHAS 4.0 includes LVM and has an LVM gui which may make it easier to transition between Veritas terminalogy and Red Hat LVM. Red Hat's LVM is very similar to HP's LVM. RHAS 3.0 has LVM but it only gives you a GUI during the install. This may or may not be a problem for you. After the install it's all command line.
I have a few clusters running OCFS and GFS. My preference from the sysadmin side is for GFS because it too contains some LVM type features that allow you to grow the size of pools dynamically. Both GFS and OCFS were tough to install and configure when they were first released but they have both gotten better. OCFS is actually pretty easy to install and configure at this point. GFS is a little more cumbersome because you have to define the fencing mechanisms, nodes, and pools. Once you figure it out it is not so bad.
The only show stopper type of gotcha I have run into with RHAS clusters, OCFS, and GFS is a bug in GFS where the first 8 characters of the hostname must be unique. This is not fixed as of GFS 6 Update 4 but RH has told me it will be fixed in the next major release (6.1?). The only way I got around this was to rename my machines.
With the Veritas cluster we had a storage compatiblity issue with our HP VA 7410. We switched the storage to a SUN T3 and got around that problem.
Other then those two issues both have been pretty stable. RH will end up being cheaper becuase you don't have to pay for Veritas. The hardware and OS costs probably won't change much from Sun.
We have multiple RHAS clusters from versions 2.1 to 4.0 with 2,3, and 4 nodes. We have several clusters running 9i RAC and 10g ASM on the same machine using ext3, RAW (and ASM managed RAW), OCFS, and GFS without a problem.

Bottom line - RHAS 3.0 was really starting to be a solid production level clustering system. RHAS 4.0 appear to be even better (but I am still waiting for cluster suite and GFS).

If anyone wants working samples of the config files for GFS just post back and I will open a new thread with them.

Thanks,
TioTony

TioTony

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fence_zvm

fence_zvm(8)						      System Manager's Manual						      fence_zvm(8)

NAME

       fence_zvm - I/O Fencing agent for GFS on s390 and zSeries VM clusters

SYNOPSIS

       fence_zvm [OPTION]...

DESCRIPTION

       fence_zvm  is  an  I/O  Fencing	agent used on a GFS virtual machine in a s390 or zSeries VM cluster.  It uses the s3270 program to log the
       specified virtual machine out of VM.  For fence_zvm to execute correctly, you must have s3270 in your PATH.

       fence_zvm accepts options on the command line as well as from stdin.  fence_node sends the options through stdin when it execs  the  agent.
       fence_zvm can be run by itself with command line options which is useful for testing.

       Vendor URL: http://www.ibm.com

OPTIONS

       -a IPaddress
	      IP address or hostname of the Physical machine (required).

       -h     Print out a help message describing available options, then exit.

       -u userid
	      userid of the virtual machine to fence (required).

       -p password
	      password of the virtual machine to fence (required).

       -S path
	      Full path to an executable to generate the password of the virtual machine to fence.

       -q     quiet mode, no output.

       -V     Print out a version message, then exit.

STDIN PARAMETERS

       agent = < param >
	      This option is used by fence_node(8) and is ignored by fence_zvm.

       ipaddr = < hostname | ip >
	      IP address or hostname of the Physical machine (required).

       passwd = < param >
	      password of the virtual machine to fence (required).

       passwd_script = < param >
	      Full path to an executable to generate the password of the virtual machine to fence.

       userid = < param >
	      userid of the virtual machine to fence (required).

SEE ALSO

       fence(8), fenced(8), fence_node(8)

																      fence_zvm(8)