Defining The Number Of Disks Devices On Vmware Esx Server; Scsi Disk Considerations For An Intel Host Running Vmware Esx Server; Lun Identification For The Vmware Esx Console - IBM TotalStorage DS6000 Attachment Manual
Host systems attachment guide
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- Introduction and planning manual (119 pages)
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6. Restart the server.
Defining the number of disks devices on VMware ESX Server
This section provides information for defining the number of disks devices on
VMware ESX Server.
The maximum number of devices that are supported on a VMware ESX Server is
128. However the VMkernel supports up to 64 concurrent I/Os. The embedded
multipathing capability of the VMkernel can manage up to 1024 disks.
The maximum number of LUNs that can be used must accommodate the 3
previous limitations.
SCSI disk considerations for an Intel host running VMware ESX server
This section provides information for identifying LUNs.
LUN identification for the VMware ESX console
This section provides LUN identification information for the VMware ESX console.
Each of the attached storage unit LUNs has a special device file in the Console OS
directory /dev. There is a maximum of 128 fibre-channel disks entries with the
following format /dev/vsd [0 -127].
From the VMware ESX console, the storage unit can be traced through several
layers:
v Host adapter level: the Host Adapter driver can provide the list of LUNs that are
v Vmhba level: VMware virtualizes the Host Adapter as a vmhba from which you
Host adapter level
The Host Adapter driver (lpfccd for Emulex) (qla23xx for QLogic) can provide
information on the port base. The content of the information varies according to the
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DS6000 Host Systems Attachment Guide
Table 7. Recommended settings for the QLogic adapter card for an Intel host running
VMware ESX Server (continued)
Parameters
Login retry count
Port down retry count
Driver load RISC code
Enable database updates
Disable database load
IOCB allocation
Extended error logging
Type of connection
detected for each fibre-channel port.
can retrieve the information that is related to the multipathing.
Recommended settings
v 60 if you are not running the SDD
v 8 if you are running the SDD
v 60 if you are not running the SDD
v 8 if you are running the SDD
Enabled
No
No
256
Disabled (You might want to enable this
parameter if you use debugging.)
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