There are two types of MetaLUNs, Concatenated and Striped. It’s unclear from your question whether your MetaLUNs are all striped, all concatenated, or some are hybrid striped and concatenated.  Best practices suggest that you do not stripe two component LUNs into the same Meta from the same RAID Group, as this would produce head thrashing on the physical disk. A single MetaLUN stripe should be comprised entirely of LUNs from independent RAID Groups. Best performance is achieved that way.  If you need to expand the MetaLUN, you can create additional component LUNs, stripe them, then concatenate that stripe onto the end of the existing MetaLUN. This will not improve performance, it will only increase capacity. So if you want to start the MetaLUN small, and grow it incrementally, then do 2 x 50GB LUNs in a stripe, and add 2 more each time you need to expand the LUN. If you plan to allocate the entire space up front, just create the 2 x 150GB LUNs and put them in a striped Meta.  If you want to create a new MetaLUN for another server, application, etc you can share the same two RAID groups and create a new striped Meta for that.  The key is not to stripe a single Meta across multiple LUNs in the same RAID Group.  Richard J Anderson
i have 2 Raid Group  of 5 FC disks each one, in RAID 5, both.  my question is Wich of the following METAluns has best performance and why? they were expanded in stripe mode  METAlun1 of 300GB with 6 components like this from RG1 (lun1-50GB + lun2-50GB + lun3-50GB) + from RG2 (lun3-50GB + lun5-50GB + lun6-50GB)  METAlun2 of 300GB with 2 components like this from RG1 (lun7-150GB) + from RG2 (lun8-150GB)  METAlun3 of 300GB with 6 components like this from  RG1 lun1-50GB +          RG2 lun3-50GB +          RG1-lun2-50GB +          RG2 lun5-50GB +          RG1 lun3-50GB +          RG2 lun6-50GB  thank you
wich of 3 metaluns has best performance? components comes from 2 x RG-Raid5