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Full Discussion: Clustering solution for RH Linux AS and Solaris x86/AMD 64
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
Old 03-02-2005
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
 

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LEARN ABOUT OPENSOLARIS

intro

Intro(9S)						    Data Structures for Drivers 						 Intro(9S)

NAME

       Intro, intro - introduction to kernel data structures and properties

DESCRIPTION

       Section	9P  describes kernel properties used by device drivers. Section 9S describes the data structures used by drivers to share informa-
       tion between the driver and the kernel. See Intro(9E) for an overview of device driver interfaces.

       In Section 9S, reference pages contain the following headings:

	   o	  NAME summarizes the purpose of the structure or property.

	   o	  SYNOPSIS lists the include file that defines the structure or property.

	   o	  INTERFACE LEVEL describes any architecture dependencies.

	   o	  DESCRIPTION provides general information about the structure or property.

	   o	  STRUCTURE MEMBERS lists all accessible structure members (for Section 9S).

	   o	  SEE ALSO gives sources for further information.

       Of the preceding headings, Section 9P reference pages contain the NAME, DESCRIPTION, and SEE ALSO fields.

       Every driver MUST include <sys/ddi.h> and <sys/sunddi.h>, in that order, and as final entries.

       The following table summarizes the STREAMS structures described in Section 9S.

       +-----------------------------+-----------------------------+
       |	 Structure	     |		  Type		   |
       +-----------------------------+-----------------------------+
       |copyreq 		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |copyresp		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |datab			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |fmodsw			     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |free_rtn		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |iocblk			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |linkblk 		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |module_info		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |msgb			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |qband			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |qinit			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |queclass		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |queue			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |streamtab		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |stroptions		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+

       The following table summarizes structures that are not specific to STREAMS I/O.

       +-----------------------------+-----------------------------+
       |	 Structure	     |		  Type		   |
       +-----------------------------+-----------------------------+
       |aio_req 		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |buf			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |cb_ops			     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_device_acc_attr	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dma_attr		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dma_cookie		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dma_lim_sparc	     |Solaris SPARC DDI 	   |
       +-----------------------------+-----------------------------+
       |ddi_dma_lim_x86 	     |Solaris x86 DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dma_req		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dmae_req		     |Solaris x86 DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_idevice_cookie	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_mapdev_ctl		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |devmap_callback_ctl	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |dev_ops 		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |iovec			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |kstat			     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |kstat_intr		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |kstat_io		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |kstat_named		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |map			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |modldrv 		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |modlinkage		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |modlstrmod		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_address		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_arq_status 	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_device		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_extended_sense	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_hba_tran		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_inquiry		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_pkt		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_status		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |uio			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Intro(9E)

NOTES

       Do not declare arrays of structures as the size of the structures can change between releases. Rely only on the structure members listed in
       this chapter and not on unlisted members or the position of a member in a structure.

SunOS 5.11							    15 May 2001 							 Intro(9S)
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