Specifications
Device Mapper Multipath I/O Configurations
Hardware
Requirements
The Device Mapper Multipath Kit has been tested by SIOS Technology Corp. with
the EMC CLARiiON CX300, the HP EVA 8000, HP MSA1500, HP P2000, the
IBM SAN Volume Controller (SVC), the IBM DS8100, the IBM DS6800, the IBM
ESS, the DataCore SANsymphony, and the HDS 9980V. Check with your storage
vendor to determine their support for Device Mapper Multipath.
Enabling support for the use of reservations on the CX300 requires that the
hardware handler be notified to honor reservations. Set the following parameter in
/etc/multipath.conf for this array:
hardware_handler “3 emc 0 1"
The HP MSA1500 returns a reservation conflict with the default path checker
setting (tur). This will cause the standby node to mark all paths as failed. To avoid
this condition, set the following parameter in /etc/multipath.conf for this array:
path_checker readsector0
The HP 3PAR F400 returns a reservation conflict with the default path checker. To
avoid this conflict, set (add) the following parameter in
/etc/default/LifeKeeper for this array:
DMMP_REGISTRATION_TYPE=hba
For theHDS 9980V the following settings are required:
l Host mode: 00
l System option: 254(must be enabled; global HDS setting affecting all
servers)
l Device emulation: OPEN-V
Refer to theHDS documentation"Suse Linux Device Mapper Multipath for HDS
Storage" or "Red Hat Linux Device Mapper Multipath for HDS Storage" v1.15 or
later for details on configuringDMMP for HDS. This documentation also provides a
compatible multipath.conf file.
For the EVA storage with firmware version 6 or higher, DMMP Recovery Kit
v6.1.2-3 or later is required. Earlier versions of the DMMP Recovery Kit are
supported with the EVA storage with firmware versions prior to version 6.
Multipath
Software
Requirements
For SUSE, multipath-tools-0.4.5-0.14 or later is required.
For Red Hat, device-mapper-multipath-0.4.5-12.0.RHEL4 or later is required.
It is advised to run the latest set of multipath tools available from the vendor. The
feature content and the stability of this multipath product are improving at a very
fast rate.
Linux
Distribution
Requirements
Some storage vendors such as IBM have not certified DMMP with SLES 11 at this
time.
SIOS Technology Corp. is currently investigating reported issues with DMMP,
SLES 11, and EMCs CLARiiON and Symmetrix arrays.
SteelEye Protection Suite for Linux101