Connecting Violin Memory Arrays to IBM AIX and PowerVM
15 www.vmem.com
6 LPAR/Host Configuration
Please follow the steps provide in this section for LPAR/host configuration.
6.1 Multi-Pathing Driver Considerations
Violin supports two multi-path options on AIX:
• IBM MPIO
• Symantec VERITAS DMP
NOTE : MPIO and DMP can coexist with EMC Powerpath on AIX
Violin 3000 and 6000 Arrays are supported with IBM MPIO on AIX. Violin distributes a path control module
(PCM) that supports IBM MPIO as an Active/Active Target. The PCM must be installed on the LPAR to support
multipathing using MPIO.
Violin arrays are also supported and certified with Symantec Veritas DMP and Storage Foundation 6.0.1. The
array support library for Violin is available for download from Symantec.
6.2 MPIO PCM installation
As a prerequisite to installing the PCM, it is required to set these parameters in both the guest LPAR and VIO
partitions.
6.2.1 Setting HBA Parameters
It is required to set the following attributes as follows on each of the FC protocol devices connecting to a Violin
Target depending on the MG BIOS. Please contact Violin Memory Technical Support to determine if the BIOS
version on the MG supports AIX default HBA settings. Determining the BIOS version of the MG requires a
“restricted shell license” to be installed on the MG which is not available to customers.
If required to change these values, the command examples are provided below.
Making these values effective requires a reboot of the partition.
Dynamic tracking for FC devices
# chdev -l fscsi0 -a dyntrk=no –P
FC Error Recovery
# chdev -l fscsi0 -a fc_err_recov=delayed_fail –P
It is recommended to set the following attributes as follows on each of the FC Adapter connecting to a Violin
Target to ensure that the FC layer yields maximum performance.
hba_num_commands
# chdev -l fcs0 -a num_cmd_elems=2048 -P
Max Transfer Size
# chdev -l fcs0 -a max_xfer_size=0x200000 -P
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