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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gfsi

gfsi(5) 							File Formats Manual							   gfsi(5)

Name
       gfsi - The Generic File System Interface

Description
       The  Generic  File  System  Interface (GFSI) is the interface between the kernel and specific file system implementations such as the local
       ULTRIX file system and the Network File System.	The Generic File System Interface has many performance improvements, along with a complete
       reorganization  of  the	file  system code.  The GFS interface has been accomplished with modifications to both the mount table, and to the
       inode, which under the GFS interface implementation is referred to as the gnode.  The gnode is defined in the and

       The GFS interface allows superusers to and file systems on local and remote machines.  Changes to the file allow any type of mount to occur
       automatically  at  boot	time  in the files and Other than mounting and unmounting file systems, users should not see any difference in the
       local file system.

       The GFS interface requires two system calls: and The system call handles generic mounted file system data.  The system call handles generic
       directory entries from any file system.

See Also
       getdirentries(2), getmnt(2), mount(2), fstab(5), nfs(5nfs), ufs(5), fsck(8), mount(8)

																	   gfsi(5)