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RE: To use SAME or NOT for High End Storage Setup ?

From: Kevin Closson <>
Date: Wed, 10 May 2006 20:19:33 -0700
Message-ID: <>

Well, it is my opinion and experience that with the type of HW you have, you should create a SAME volume of max at least 1MB stripe width tht consists of all the LUNS (each being RAID1+0 themselves).  

If you don't need all the disk capacity, you would do well to look into the volume manager you are using to try to create the database volume using outer-most disk sectors...that is not always possible, I know, but is sound principle.  

I've done 1000+ disk OLTP benchmarks this way and it works.  

After reading this list for a while, I am also certainly convinced that sometimes man bites dog, so there will invariably be somene who will chime in with better advise than SAME.  

        For a DS8300 High End Storage:-          

        Which one of the following 2 is advisable:-

        Qs. 1 Should ALL of the 47 (Hardware RAID 1+0) LUNs be Added into a Single Volume using Volume Manager (RAID 1 - Striping) - SAME concept?          

        Qs. 2 Optionally should some "Optimal Num / sets" of these (RAID 1+0) LUNs be added / assimilated into different (multiple) Volumes (of RAID 1 - Striping)? If so, What should be this Optimal Num of LUNs per Volume (4,6 or 8 LUNs) ?          

        NOTE - Database will be Laid out across all the 47 underlying LUNs          

        Qs. 3 Being an OLTP type Banking application 64 KB Stripe Unit Size is being considered for Both of the following 2:-

        i) The underlying Hardware RAID1+0 for LUN creation

        ii) Also for the Volume Creation using Volume Manager (RAID 1 - Striping)

        Would folks advise using different Stripe Unit Size for the above (i) & ii)?          

        Thanks indeed          

Received on Wed May 10 2006 - 22:19:33 CDT

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