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1.
Two or more Storage Controllers
on the array
2.
Two or more Storage Host Port on the array
3.
Two or more HBA ports per
Host
4.
Two or more At Least two
SAN switches
5.
A single SAN Fabric Zone
per path
HBA card is the device that
connects computers and servers to a Storage Area Networks (SANs) via fiber. It’s an I/O adapter that connects a host
I/O bus to a computer’s memory system. It initiates an I/O operation over a Fibre Channel (FC) network to Storage.
Install the HBA.
Verify the BIOS
Install the BIOS.
Install the driver.
Install the HBA applications
kit from the vendors.
Linux currently do not have
kernel command like drvconfig or ioscan.
For a dynamic SCSI channel
reconfiguration so do one of the following:
Reboot the host
Unload and load the HBA
driver
Echoing the SCSI device
list in /proc
Execute a SCSI scan exposed
to /sys
Execute a SCSI scan function
through HBA vendor scripts
I can set up multiple redundant data paths (multipaths) between
Linux servers and storage systems to help avoid interruptions
in data flow if a hardware failure occurs.
I have used the ‘multipath’ command on the Linux server(s) to verify that the storage systems were visable to the OS.
multipath [options] [device]
-ll show the current
multipath topology from all available information
Fibre channel host bus adapters
(HBAs) intelligently connect storage and Linux servers.
Eg:
QLogic host bus adapter
Without persistent binding,
after every reboot, the SCSI id of a LUN may change.
1. Active-Active
2. Active-Passive
