Updating subject line.
regards,Adarsh.

On 27 April 2012 13:43, Adarsh <adarshanto@gmail.com> wrote:

Hello,
Please note that when I remove a LUN, I will follow the "Clean Device Removal"

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/removing_devices.html



However, sometimes people won't *follow those steps.I want to handle such scenarios gracefully.


regards,Adarsh.

On 27 April 2012 12:58, Adarsh <adarshanto@gmail.com> wrote:


Hello,
I am trying to setup a RH Linux multipath setup with 256 LUNs.I am facing an issue.


After deleting a LUN, I am invoking "multipath" command to immediately update the MPIO database.
However, it takes 30-40 minutes mostly.Kindly advice how I can reduce the time taken to a few minutes at the max.



Also, how often does multipathd update the MPIO database.Basically, I am trying to remove the stale LUN as soon as possible from the database (say 5-8 seconds)


Is there any way to ensure/force that.
Any help will be really appreciated.



regards,Adarsh.




Setup:=====


RHEL 5.6 (Linux x336-207-59 2.6.18-238.9.1.el5)Multipath tools: 0.4.7



multipath.conf:============


defaults {* * * * user_friendly_names * * no* * * * max_fds * * * * * * * *max* * * * queue_without_daemon * no* * * * pg_prio_calc * * * * * avg* * * * flush_on_last_del * * *yes


}
blacklist {* * * * wwid * * * * * * * * * SIBM-ESXSMAW3073NC_FDAR9P6402P4G* * * * wwid * * * * * * * * * SIBM-ESXSMAW3073NC_FDAR9P6402PU9* * * * devnode * * * * * * * *"^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"


* * * * devnode * * * * * * * *"^hd[a-z]"* * * * devnode * * * * * * * *"^cciss.*"}
devices {* * * * device {* * * * * * * * vendor "NETAPP"


* * * * * * * * product "LUN"* * * * * * * * getuid_callout "/sbin/scsi_id -g -u -s /block/%n"* * * * * * * * prio_callout "/sbin/mpath_prio_alua /dev/%n"


* * * * * * * * hardware_handler "0"* * * * * * * * failback immediate* * * * * * * * flush_on_last_del yes* * * * }}




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