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Re: [Linux-cluster] Local Partitions detected as Multipath Device



Creating a new RAMDISK resolved the issue as suggested by Elvir Kuric after blacklisting the local disk in multipath.conf .

====
$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda8             43112964  19708732  21214204  49% /
tmpfs                 32978736     25836  32952900   1% /dev/shm
/dev/sda1               198337     66006    122091  36% /boot
/dev/sda6             10079084    840160   8726924   9% /opt
/dev/mapper/mpathbp1  51606124    184136  48800552   1% /webdata
/dev/mapper/mpathcp1 209690016   3414728 206275288   2% /sharedweb
===

Other options of  setting following parameter  " find_multipaths  yes"  did not helped to resolve the issue.

Thanks all for the replies and suggestions.

Thanks
Zaman


On Tuesday, 22 October 2013 4:58 PM, Elvir Kuric <ekuric redhat com> wrote:
On 10/22/2013 12:17 PM, Zama Ques wrote:
My local partitions are detected as multipath device
$multipath -l

mpathb (360014380125d90420000a000003e0000) dm-9 HP,HSV450
size=200G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
`- 3:0:0:1 sdb 8:16 active undef running
mpatha (3600508b1001c02143bc59c6862d97353) dm-0 HP,LOGICAL VOLUME
size=137G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
`- 0:0:0:1 sda 8:0  active undef running
I added the following lines in multipath.conf so that local partitions are not considered as multipath device
blacklist {
   wwid 3600508b1001c02143bc59c6862d97353
}
Executed the following commands after that .
#service multipathd reload

# multipath -F
Oct 22 12:10:42 | mpathb: map in use
Oct 22 12:10:42 | mpatha: map in use
So , tried rebooting the server , but no luck . Any clues to resolve the issue will be highly appreciated .

Thanks
Zaman


hi,

/me wonders what OS ( and version ) is in use? service multipathd relaod ... suggest it is something RHEL based ( not 100 % sure )

Check /etc/multipath/* files ( if rhel 6 )  and see is there WWID from above, and also check initramfs ( RHEL 6 ) or initrd file  ( RHEL 5 ) from /boot

do below

# mkdir /tmp/initrdtest
# cp /boot/initramfs-$$$$.img ( or initrd ... ) /tmp/initrdtest

unpack it

# cd tmp/initrdtest

# zcat initrd.img | cpio -i

and check what is there for multiapth devices written.

In short, I think you will need to ensure there are not records for devices you want to blacklist in /etc/multipath/* ( rhel 6 ) or /var/lib/multipath/*   ( rhel 5 ) and rebuild initramfs / initrd ( depending is it RHEL 5 - initrd / RHEL 6 -initramfs  ) once these records are not present.Rebuilding initrd/initramfs will pick values from /etc/multipath/*  ( rhel 6 ) or /var/lib/multipath/ ( rhel 5 )

to rebuild initrd/initramfs check docs out there  but in short process is ( after you remove records for WWID from wwid and bindings files - read above )


RHEL 5:

# cd /boot
# cp initrd-$(uname -r).img initrd-$(uname -r).img.backup [ make backup ]
# mkinitrd -v -f initrd-$(uname -r).img
# reboot ( to boot to new initramfs )

RHEL 6:

same as above with small corrections ;)


# cd /boot
# cp initramfs-$(uname -r).img initramfs-$(uname -r).img.backup [ make backup ]
# dracut -v -f initramfs-$(uname -r).img
# reboot ( to boot to new initramfs )


good reading https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/DM_Multipath/config_file_blacklist.html  

hope this helps

Kind regards,

-- 
Elvir Kuric, Senior Technical Support Engineer / Red Hat / GSS EMEA / 




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