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EMC Host Connectivity with QLogic FC and iSCSI HBAs and FCoE CNAs for the Linux Environment
Configuring a Boot Device on an EMC Storage Array
– An alternative to masking the VCM DB is to map the
Volume Logix database device so that it is the highest LUN
presented to the host. Be aware that the LUN number
should not be higher than 254 (FE).
Note: The EMC-recommended method is to use LUN masking.
• VNX series or CLARiiON ghost LUN - If no LUN 0 exists in
the storage group, a phantom device (LUNZ) will be
presented by the array in its place. Additionally, a valid LUN 0
presented via an inactive path acts as a not-ready device.
Always ensure that a valid LUN 0 is present in the storage
group and that it is owned by the SP connected to the boot
HBA. If the boot LUN trespasses, a system crash may result.
◆ When attaching the Linux host to an EMC storage array, use the
adapter in the lowest-numbered PCI slot in the server. To keep the
configuration and installation simple, it is recommended that
only that single adapter be cabled to the arrays. Ensure that the
boot BIOS has been applied to the adapter.
◆ The installer installs the boot block onto only the first disk it sees.
This includes SCSI and IDE drives in the server. If only EMC
storage array devices attached to the system, the boot BIOS
should be set to the first LUN the adapter sees. If there are other
local disks in the system and depending on how Linux discovers
the controllers and drives, , it may be necessary to remove the
local disks in order for the boot block to be properly located on
the desired device.
Symmetrix-specific limitations
Consider the following Symmetrix-specific limitations:
◆ Prior to the installation on a Symmetrix LUN, the Linux host HBA
must have successfully logged into the array. Using Solutions
Enabler from another host, at least one LUN must be assigned to
the host.
◆ During the installation procedure, it is recommended that only
one LUN be allocated to the host for ease of installation. Once the
installation has completed, additional LUNs may be assigned to
the host.