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Atıf CEYLAN 09-30-2011 01:56 PM

Dell MD3600F
 
Hi all,

I have a new dell md3600f ( 2 controller ) fiber channel storage, two
qlogic 2560 single port HBAs and two brocade 300 switches. FC cables
are redundant connected between switches and
storage controllers.

Â*

I have installed multipath-tools and configured my multipath.conf file.
I couldn't find and understandÂ* the "mpath_prio_rdac" file. There isn't
the file on the disk and repos.Â*

What / Where is the file?



The multipath software and failover mechanism are work fine. But I get
lot of failures at computer boot time and when after down/up the switch
port. These failures are shown asÂ* "Buffer I/O error on device sdc,
logical block" in kern.log but there is no problem on runtime and I can
access to the all disk volume on the storage.Â*



My system is debian/squeeze. How can I solve this problem?



The multipath.conf file content is below:



defaults {

Â*Â*Â*Â*Â*Â*Â* udev_dirÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* /dev

Â*Â*Â*Â*Â*Â*Â* max_fdsÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* 8192

Â*Â*Â*Â*Â*Â*Â* user_friendly_namesÂ*Â*Â*Â* yes

}



blacklist {

Â*Â*Â* # System disks

Â*Â*Â* device {

Â*Â*Â*Â*Â*Â*Â* vendor ATA

Â*Â*Â*Â*Â*Â*Â* product *

Â*Â*Â* }Â*Â*Â*

Â*Â*Â* device {

Â*Â*Â*Â*Â*Â*Â* vendor SAMSUNG

Â*Â*Â*Â*Â*Â*Â* product *

Â*Â*Â* }

}



multipaths {

Â*Â*Â* Â*Â*Â* multipath {

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* wwidÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* 12340000004ea0984ee33874712347238

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* aliasÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* test_vol1

Â*Â*Â*Â*Â*Â*Â* }

}



devices {

Â*Â*Â*Â*Â*Â*Â* device {

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* vendorÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* "DELL"

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* productÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* "MD36xxf"

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* path_grouping_policyÂ*Â* group_by_prio

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* prioÂ*Â*Â* Â*Â*Â* Â*Â*Â* Â*Â*Â* Â*Â*Â* Â*Â*Â* rdac

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* polling_intervalÂ*Â*Â*Â*Â*Â*Â* 5

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* path_checkerÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* rdac

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* path_selectorÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â* "round-robin 0"

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* hardware_handlerÂ*Â*Â*Â*Â*Â*Â* "1 rdac"

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* failbackÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* immediate

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* #featuresÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* "2 pg_init_retries 50"

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* no_path_retryÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â* 30

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* rr_min_ioÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* 100

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* prio_calloutÂ*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* "/sbin/mpath_prio_rdac /dev/%n"

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* getuid_calloutÂ*Â*Â*Â*Â*Â*Â*Â*Â* "/lib/udev/scsi_id
--whitelisted --device=/dev/%n"

Â*Â*Â*Â*Â*Â*Â* }

}





--

/**

* @author Atıf CEYLAN

* Software Developer & System Admin

* http://www.atifceylan.com

*/


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