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AIX Host Identifies the Storage LUNs in the Local Disk Format because the Storage Device Information is not Updated

Publication Date:  2012-07-20 Views:  48 Downloads:  0
Issue Description
The AIX 6.1 host is connected to the S5300 by using Brocade SW300 FC switches to form a multipathing application scenario, that is, the primary controller (controller A) and secondary controller (controller B) of the S5300 are connected to SW300 switches respectively by using optical fibers. The AIX host has two FC HBAs that are connected to SW300 switches by using optical fibers. Four zones are configured on SW300 switches.
After the S5300 and the AIX host are configured according to the connection sequence, the AIX 6.1 host can discover the LUNs mapped by the S5300, but on the AIX 6.1 host, the LUNs of the S5300 are displayed in the format of hdiskx by running the lspv command. x indicates a digit.
Phenomena:
# lspv
hdisk1  rootvg  rootvg  active
hdisk2  rootvg  rootvg  active
hdisk3  none        none   
hdisk4  none        none

hdisk22 none        none
hdisk3 to hdisk22 indicate the LUNs of the S5300. The LUNs are in the format of hdiskx.
On the AIX 6.1 host, local disks are displayed in the format of hdiskx, while the disks in the S5300 are displayed in the format of updiskx. If the AIX host identifies the LUNs of the S5300 in the local disk format, it is hard to distinguish local disks and disks in the S5300.
Alarm Information
None
Handling Process
Log in to the AIX 6.1 host as user root and do as follows:
Step 1  Run the following command to delete the disks.
# /opt/UltraPath/bin/uprmdisk all
uprmdisk is a parameter included in the UltraPath software and used to delete the disks in the storage device. After this command is executed, the relevant disk information is deleted from the system.
Step 2  Run the cfgmgr -v command to rescan disks.
# cfgmgr -v
This command is used to scan all disks connected to the storage system and discover new disks.
Step 3  Run the lspv command to view the discovered disks.
# lspv
hdisk1  rootvg  rootvg  active
hdisk2  rootvg  rootvg  active
updisk0 none        none   
updisk1 none        none

updisk2 none        none
The change of the name format is complete.
Root Cause
This fault often occurs if the physical connection is complete and the cfgmgrn command is executed to scan disks before the UltraPath software is installed. As the device information is not updated to the device database, the LUNs of the S5300 is named in the format of hdiskx by running the lspv command.
Suggestions
Do not connect network cables or optical fibers before the UltraPath software is not installed to avoid that the disks in the S5300 are named in the format of hdiskx.

END