March 2013 Dell EqualLogic Configuration Guide v14.1 5-38• Do not mix arrays with different drive technologies (SATA, SAS, SSD) within a single pool unlessthey are running a unique RAID policy.• Do not mix arrays with different controller speeds (1GbE, 10GbE) within a single pool unlessthey are each running unique RAID policies.5.2 VolumesVolumes provide the storage allocation structure within an EqualLogic SAN. Volumes are seen on thenetwork as iSCSI targets by hosts and are presented to the user as disk drives once the iSCSI initiatorhas been configured and authenticated to the volume. Only computers with an iSCSI initiator and thecorrect access credentials can access a volume. Disk space for volumes is allocated from the targetstorage pool’s free space.Volumes are identified within the Group Manager with a unique volume name. The volume name iscreated by the administrator during volume creation and can be configured with several additionalcharacteristics and capabilities. The following sections provide additional details.5.2.1 Volume attributesVolumes are created using the “create volume” function in Group Manager or through the CommandLine Interface (CLI). Each volume must have a unique name that is used by Group Manager to identifyand manage the volume. Volume names may be changed via Group Manager at any time. Volumenames must meet the following requirements:• 1 to 64 alpha-numeric characters• A-Z, a-z, 0-9, “.”, “-“, “:” are legal charactersVolumes are assigned a unique iSCSI Qualified Name (iqn) that consists of the following parts:• “iqn” followed by a “.” (period)• Year and Month of first full month that the naming authority was registered with standardsbody. EqualLogic’s value is “2001-5” followed by a “.”• The storage provider’s domain name in reverse order. For example: “com.equallogic”• A colon (“:”)• Vendor specified information to identify an iSCSI target or initiator as unique within the vendordomain. For EqualLogic iSCSI targets, this part consists of a unique set of numbers and theuser assigned volume name (within Group Manager).The following is an example of an iSCSI target name for a volume named db3:iqn.2001-05.com.equallogic:7-8b0900-6d0000000-001ebbc5d80sf0k0-db3Volumes are visible to iSCSI initiators through one or more of three mechanisms during volumecreation:• iSCSI initiator IP address• A host’s iSCSI iqn well-known name• Mutual CHAP authenticated user identity
