Chapter 2: Planning for Using Disk Shelves with a Gateway 21Guidelines for creating aggregatesRestrictions onmixing storagetypes in anaggregateData ONTAP does not support mixing different types of storage in the sameaggregate because it causes performance degradation. For example, you cannotmix the following storage types in the same aggregate:◆ Native disks and array LUNs◆ Different types of disk drivesNoteAvoid mixing drives with different disk speeds in the same aggregate;mixing drives of different speeds in the same aggregate directly affects diskinput/output operations per second and response time.◆ Native disks with block checksum type and native disks with zonedchecksum type◆ Array LUNs from Fibre Channel disks and array LUNs from SATA disks◆ Array LUNs from storage arrays from different vendors◆ Array LUNs from storage arrays from different familiesNoteStorage arrays in the same family share the same characteristics. See thegateway Implementation Guide for your vendor for information about howthe gateway defines family members for the vendor.◆ Array LUNs from storage arrays with 4-Gb HBAs and LUNs from storagearrays with 2-Gb HBAsExample: The following command creates an aggregate called vs23b_vol1 withthe same type of storage in it—four FCAL disks on systems running DataONTAP 8.0 7-Mode and 7.x releases:aggr create vs23b_vol1 -T FCAL -n 4Considerationswhen preservingaggregates whenmoving a shelfData ONTAP does not support duplicate aggregate and volume names on thesame system. If you want to preserve the data on a disk shelf you are moving tothe gateway, check the aggregate and volume names on the disk shelf andgateway for duplicates before you move the disk shelf. If you discover aggregate
