Best practices for creating MetaLUNs on VNX or CLARiiON arrays

                               Using large MetaLUNs can help boost overall performance, by spreading the performance load over multiple drives.  However, with high capacity drives, this generally means that the RAID groups will be shared by multiple applications.  This, in turn, means that the I/O performance for one application will vary according to the performance loads of other applications.  If consistent performance is needed, either use dedicated RAID groups or consider implementing Navisphere Quality of Service Manager (NQM).

Also please refer to primus article “emc226845” for the steps required to create MetaLUNs on VNX or CLARiiON array

For information about metaLUNs - Best Practice, please see the following document on PowerLink:

White Paper EMC CLARiiON MetaLUNs - A Detailed Review.pdf

http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H1024.1_clariion_metaluns_cncpt_wp_ldv.pdf

glen

On the CLARiiON, I make a map of the busses, enclosures and disks and try to spread my RAID Groups across the busses.  For example in an array with 4 x busses I would make 4 RAID groups, one on each bus.  Lets' number them RAID Groups 100, 200, 300, 400.   Then I would make 4 equal size LUNs on each of the RAID Groups.  Let's number them 1000, 2000, 3000 and 4000. Then I would make my MetaLUN on the 4 x LUNs, one in each RAId Group, one on each bus.  Then I would "rotate" the Meta Heads, so that the 1st MetaLUN consists of LUNs 1000, 2000, 3000 and 4000.  Then the 2nd MetaLUN would consist of LUNs 2001, 3001, 4001 and 1001.  Etc.

Stuart