Comments on: Fixing pivotroot: pivot_root(/sysroot,/sysroot/initrd) failed: 2 umount error

By: Kristian Reese

Kristian Reese — Sun, 19 Feb 2012 14:36:42 +0000

As Keith indicates, boot from a linux installation CD and at the boot: prompt, type: linux rescue

To my original post, the contents of /target/root/multipath-files/mutipath.conf are:

devnode_blacklist {
devnode “^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*”
devnode “^hd[a-z]”
devnode “^cciss!c[0-9]d[0-9]*”
}

defaults {
udev_dir /dev
rr_min_io 128
failback immediate
no_path_retry queue
default_path_grouping_policy failover
polling_interval 5
}

devices {
device {
vendor “NETAPP”
product “LUN”
path_grouping_policy failover
prio_callout none
features “1 queue_if_no_path”
path_checker directio
failback immediate
}
}

multipaths {
multipath {
wwid @SDAID@
alias mpsda
}

multipath {
wwid @SDBID@
alias mpsdb
}

multipath {
wwid @SDCID@
alias mpsdc
}
}

so you could simply take the contents of multipath.conf and input the results of each scsi_id command for each wwid instead of following my post command for command. The reason I had to update mine was because I migrated the luns to another netapp and therefore, the scsi_id changed for each lun.

By: Keith

Keith — Mon, 13 Feb 2012 16:50:54 +0000

You’ll need to mount the filesystem from a rescue kerenel or disc. I typically use the knoppix livecd system.

By: Naim Shaikh

Naim Shaikh — Mon, 13 Feb 2012 07:07:28 +0000

But i am not able to reach to command prompt. Where i can pass this mkdir command? Please suggest.Thanks.

By: Kristian Reese

Kristian Reese — Thu, 20 May 2010 05:04:45 +0000

I came across this problem as well with iscsi LUNs using qlogic HBA’s. The solution in a nutshell for me was to rebuild initrd with the new SCSI ID’s of the LUNs and update the multipath configuration.

boot from cdrom and linux rescue

mkdir /target
mount /dev/sda1 /target

SDA_ID=”`/sbin/scsi_id -g -u -s /block/sda`”
SDB_ID=”`/sbin/scsi_id -g -u -s /block/sdb`”
SDC_ID=”`/sbin/scsi_id -g -u -s /block/sdc`”

cp /target/root/multipath-files/multipath.conf /target/etc/multipath.conf
sed -i -e “s:@SDAID@:${SDA_ID}:g” \
-e “s:@SDBID@:${SDB_ID}:g” \
-e “s:@SDCID@:${SDC_ID}:g” /taret/etc/multipath.conf

losetup /dev/loop1 /target/root/multipath-files/initrd.img

mkdir /target/root/multipath-files/tmp
mount /dev/loop1 /target/root/multipath-files/tmp
cp /target/etc/multipath.conf /target/root/multipath-files/tmp/etc/multipath.conf
umount /target/root/multipath-files/tmp
losetup -d /dev/loop1
rmdir /target/root/multipath-files/tmp

cp /target/root/multipath-files/initrd.img /target/root/multipath-files/initrd.img.tmp
gzip /target/root/multipath-files/initrd.img.tmp
mv /target/root/multipath-files/initrd.img.tmp.gz /target/boot/initrd-KERNEL_VERSION-mpath.img

–
Kristian Reese