Install SAN host utilities
(PowerVM vSCSI) Discovering and configuring LUNs
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When you are using PowerVM vSCSI and VIO servers, you must use the padmin login and the commands appropriate for it to configure and discover LUNs.
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Log in to the host as padmin.
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On the AIX host, enter the following command to discover the newly created LUNs:
cfgdevThe cfgdev command causes:
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The initiators to log into the fabric.
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The system to check for new devices.
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The system to create new device entries where the new LUNs are mapped as MPIO devices using the default PCM.
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To verify that the hdisk MPIO devices were created, enter the following command:
lsdev -type diskThe LUNs appear on the host as disks. You can use these disks the same way you use local disks on the host.
Write down the hdisk instance numbers. You use them when you perform the path configuration.
The
lsdev -type diskcommand produces the following type of output. The output in this example has been truncated.vioserver$ lsdev -type disk NetApp name status description hdisk0 Available 16 Bit LVD SCSI Disk Drive hdisk1 Available 16 Bit LVD SCSI Disk Drive hdisk2 Available MPIO NetApp FCP Default PCM Disk hdisk3 Available MPIO NetApp FCP Default PCM Disk hdisk4 Available MPIO NetApp FCP Default PCM Disk hdisk5 Available MPIO NetApp FCP Default PCM Disk hdisk6 Available MPIO NetApp FCP Default PCM Disk
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To get information about you setup, enter the following command:
lsdev -dev hdisk_name -attrThe
lsdev -dev hdisk_name -attrcommand produces the following output:vioserver$ lsdev -dev hdisk2 -attr attribute value description user-settable PCM PCM/friend/NetApp PCM Path Control Module False PR_key_value none Persistent Reserve Key Value True algorithm round_robin Algorithm True clr_q no Device CLEARS its Queue on error True dist_err_pcnt 0 Distributed Error Sample Time True dist_tw_width 50 Distributed Error Sample Time True hcheck_cmd inquiry Health Check Command True hcheck_interval 30 Health Check Interval True hcheck_mode nonactive Health Check Mode True location Location Label True lun_id 0x2000000000000 Logical Unit Number ID False lun_reset_spt yes LUN Level Reset True max_transfer 0x100000 Maximum TRANSFER Size True node_name 0x500a0980894ae0e0 FC Node Name False pvid 00067fbad453a1da0000000000000000 Physical volume identifier False q_err yes Use QERR bit True q_type simple Queuing TYPE True qfull_dly 2 Delay in seconds for SCSI TASK SET FULL True queue_depth 64 Queue DEPTH True reassign_to 120 REASSIGN time out value True reserve_policy no_reserve Reserve Policy True rw_timeout 30 READ/WRITE time out value True scsi_id 0xd10001 SCSI ID False start_timeout 60 START unit time out value True ww_name 0x500a0984994ae0e0 FC World Wide Name False
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If your configuration does not support ALUA, you must execute the dotpaths utility to set the path priorities. The dotpaths utility is installed when you install the Host Utilities. Do not use the dotpaths utility if ALUA is enabled. Switch to the
oem_setup_envmode to execute the dotpaths by entering the following command:oem_setup_envWhen you enter the
oem_setup_envmode, the command line prompt changes from a dollar sign to a pound sign and you remain inoem_setup_envmode until you halt it by entering a command such as exit.Example`# vioserver$ oem_setup_env -
If your configuration supports ALUA, you can use it to set path priority. Verify that ALUA is enabled:
lun igroup show -instance igroup_name-
If ALUA is not enabled, enable it:
igroup set igroup_name alua yes
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If your configuration does not support ALUA, you must execute the dotpaths utility to set the path priorities. The dotpaths utility is installed when you install the Host Utilities. Do not use the dotpaths utility if ALUA is enabled.
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To set the priority for all Data ONTAP LUNs enter:
dotpaths -
To set priority for a specific set of disk enter:
dotpaths [-hqv] [hdiskN …]Use the
-voption to enable verbose mode and display all the priorities. Use the-qoption to query all or individual disk priorities.The following is an example of using the dotpaths utility:
vioserver# dotpaths -v hdisk2 (path 0): Optimized path - Setting priority to 255 hdisk2 (path 1): Optimized path - Setting priority to 255 hdisk2 (path 2): Unoptimized path - Current priority of 1 is correct hdisk2 (path 3): Unoptimized path - Current priority of 1 is correct ... Path priority set and/or verified for 22 disks, 86 total paths. vioserver#
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To verify that the host has discovered the LUNs, enter the following command:
# sanlun lun show -pExampleThis example shows typical output of the
sanlun lun show -pcommand for a direct-attached configuration. It also includes thesanlun lun show -d hdisk9 -vcommand to display information about hdisk9. The output from this command has been truncated.sanlun lun show -p ONTAP Path: fas3170-aix03:/vol/ibmbc_aix01b14_fcp_vol8/ibmbc-aix01b14_fcp_lun0 LUN: 8 LUN Size: 3g Controller CF State: Cluster Enabled Controller Partner: fas3170-aix04 Host Device: hdisk9 Mode: 7 Multipath Provider: AIX Native Multipathing Algorithm: round_robin --------- ----------- ------ ------- ------------- ---------- host controller AIX controller AIX MPIO path path MPIO host target path state type path adapter port priority --------- ----------- ------ ------- ------------- ---------- up secondary path0 fcs0 3b 1 up primary path1 fcs0 3a 1 up secondary path2 fcs0 3a 1 up primary path3 fcs0 3b 1 up secondary path4 fcs0 4b 1 up secondary path5 fcs0 4a 1 up primary path6 fcs0 4b 1 up primary path7 fcs0 4a 1 up secondary path8 fcs1 3b 1 up primary path9 fcs1 3a 1 up secondary path10 fcs1 3a 1 up primary path11 fcs1 3b 1 up secondary path12 fcs1 4b 1 up secondary path13 fcs1 4a 1 up primary path14 fcs1 4b 1 up primary path15 fcs1 4a 1sanlun lun show -vd hdisk10 device host lun vserver lun-pathname filename adapter protocol size mode ------------------------------------------------------------------------------------------------------------------------ GPFS_p520_FC /vol/GPFS_p520_FC_FlexVol_2/GPFS_p520_FC_LUN_2_4 hdisk10 fcs3 FCP 100g C LUN Serial number: 1k/yM$-ia5HC Controller Model Name: N5600 Vserver FCP nodename: 200200a0980c892f Vserver FCP portname: 200a00a0980c892f Vserver LIF name: GPFS_p520_FC_2 Vserver IP address: 10.225.121.100 Vserver volume name: GPFS_p520_FC_FlexVol_2 MSID::0x00000000000000000000000080000420 Vserver snapshot name: