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Re: [dm-devel] device mapper / multipath



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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