Comments on: Fixing pivotroot: pivot_root(/sysroot,/sysroot/initrd) failed: 2 umount error http://backdrift.org/fixing-pivotroot-pivot_rootsysrootsysrootinitrd-failed-2-umount-error Sat, 21 Jan 2012 13:22:59 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Kristian Reese http://backdrift.org/fixing-pivotroot-pivot_rootsysrootsysrootinitrd-failed-2-umount-error/comment-page-1#comment-328 Kristian Reese Thu, 20 May 2010 05:04:45 +0000 http://backdrift.org/?p=133#comment-328 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 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

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