Wednesday, 29 May 2013

Improved-control-for-live-partition-mobility-choose-your-destination-fibre-channel-port

There is a drawback in  Live partition Mobility .When there are fibre channel adapters in the frame laprs , always when mobility operation is performed the moving lpar is always using the first fibre channel adapter.

If you have more lpars in the frames it would be make your work worst ,fibre channel switch port can be saturated.


With the new release of PowerVM, you can now choose the destination fibre channel adapter and all lpars can be distributed among all fibre channel adapters.

Prerequisites

Be sure Hardware Management Console and Virtual I/O Server are up to date with the latest version :
  • Hardware Management Console version has to be 7.6.0 :
# lshmc -V
"version= Version: 7
 Release: 7.6.0
 Service Pack: 1
HMC Build level 20121109.1
","base_version=V7R7.5.0
  • Source and destination Virtual I/O Servers have to be 2.2.2.1 :
# ioslevel
2.2.2.1

Mobility


Here is an example : all virtual fibre channel adapters are mapped on the same fibre channel adapter : fcs0 is mapped to seven virtual fibre channel adapters, and fcs1 to none, this is a result of multiple mobility operations :
# lsnports
name             physloc                        fabric tports aports swwpns  awwpns
fcs0             U5803.001.9ZZ03PZ-P1-C2-T1          1     64     57   2048    2021
fcs1             U5803.001.9ZZ03PZ-P1-C2-T2          1     64     64   2048    2048

# lsmap -all -npiv | grep "FC name"
FC name:fcs0                    FC loc code:U5803.001.9ZZ03PZ-P1-C2-T1
FC name:fcs0                    FC loc code:U5803.001.9ZZ03PZ-P1-C2-T1
FC name:fcs0                    FC loc code:U5803.001.9ZZ03PZ-P1-C2-T1
FC name:fcs0                    FC loc code:U5803.001.9ZZ03PZ-P1-C2-T1
FC name:fcs0                    FC loc code:U5803.001.9ZZ03PZ-P1-C2-T1
FC name:fcs0                    FC loc code:U5803.001.9ZZ03PZ-P1-C2-T1
FC name:fcs0                    FC loc code:U5803.001.9ZZ03PZ-P1-C2-T1
Choosing the destination fibre channel adapter can only be done using command line (I hope a dialog box will be available with the next Hardware Management Console release). You have to choose the destination adapter by your own :
  • Before the mobility operation 64 aports are available on fcs5 on this Virtual I/O Server :
# lsnports
name             physloc                        fabric tports aports swwpns  awwpns
fcs2             U5803.001.9ZZ03PZ-P2-C2-T1          1     64     64   2048    2048
fcs3             U5803.001.9ZZ03PZ-P2-C2-T2          1     64     64   2048    2048
fcs4             U5803.001.9ZZ03PZ-P2-C3-T1          1     64     64   2048    2048
fcs5             U5803.001.9ZZ03PZ-P2-C3-T2          1     64     64   2048    2048
  • The mobility operation is launched by the command line only, as you can see fibre channel adapter fcs5 is used on this mobility operation :
# migrlpar -o m -m P795-SRC -t P795-DST -p lpar-test -w 1 -i 'virtual_fc_mappings="10/vios1/15//fcs5,11/vios2/16//fcs5",source_msp_name=vios3,dest_msp_name=vios1,shared_proc_pool_name=shp_test'
  • After the mobility operation 63 ports are available on fcs5 on the destination Virtual I/O Server :
# lsnports
name             physloc                        fabric tports aports swwpns  awwpns
fcs2             U5803.001.9ZZ03PZ-P2-C2-T1          1     64     64   2048    2048
fcs3             U5803.001.9ZZ03PZ-P2-C2-T2          1     64     64   2048    2048
fcs4             U5803.001.9ZZ03PZ-P2-C3-T1          1     64     64   2048    2048
fcs5             U5803.001.9ZZ03PZ-P2-C3-T2          1     64     63   2048    2045

Use case

After moving all my lpars from one machine to another here is the result : all lpars fibre channel adapters are distributed among all the real fibre channel adapters.
# lsnports
name             physloc                        fabric tports aports swwpns  awwpns
fcs0             U5803.001.9ZZ03PZ-P2-C6-T1          1     64     43   2048    1967
fcs1             U5803.001.9ZZ03PZ-P2-C6-T2          1     64     58   2048    2030
fcs4             U5803.001.9ZZ03PZ-P2-C8-T1          1     64     55   2048    2017
fcs5             U5803.001.9ZZ03PZ-P2-C8-T2          1     64     59   2048    2033
# /usr/ios/cli/ioscli lsmap -all -npiv | grep "FC name" | sort | uniq -c
  12 FC name:fcs0                    FC loc code:U5803.001.9ZZ03PZ-P2-C6-T1
   8 FC name:fcs1                    FC loc code:U5803.001.9ZZ03PZ-P2-C6-T2
   8 FC name:fcs4                    FC loc code:U5803.001.9ZZ03PZ-P2-C8-T1
   9 FC name:fcs5                    FC loc code:U5803.001.9ZZ03PZ-P2-C8-T2

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