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List:       gfs-devel
Subject:    [gfs-devel] GFS requirements for clustered Volume Manager.
From:       Ramachandra Pai <linuxram () yahoo ! com>
Date:       2001-06-29 17:09:30
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Hi Everybody,
	I am consolidating a list of requirements for EVMS to
support clustered volume management.  One of 
the areas that I am particularly interested          
in is finding out what support clustered filesystems
need from EVMS in order to be able to work with EVMS. 
I have already talked to the GPFS                    
guys here in IBM.  They told me that they would like
to see the following things implemented in EVMS so
that GPFS could work with EVMS:

	1. Global volume device naming - 
              i.e. volumes should have the same name
              on all the nodes
	2.  Persistant names - i.e. the name of a
              volume should not change 
              for the life of the volume, unless 
              specifically changed by the user.
	3. Large I/O path - i.e. large ( >= 256 KB)  
           raw I/O requests actually reach the device
           driver without being broken up into smaller

           requests.
	4. Scalability - i.e. support large 
                               clusters               
           (support at least 1024 nodes
 	    where each node may have either private  
            storage, access to shared storage, or 
            both )
                       
    	What features would GFS expect from a  
                       clustered volume manager?
       	Clustered volume snapshots?
	Volume access statistics?
        DMEP semantics on volumes?
        

Thanks,
Ram Pai

=====
Ram PaiIBM Corporation,Beaverton OR-97006linuxram@yahoo.com or pair@us.ibm.com

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