LinuxQuestions.org - REHL 5.4 dmraid 1 problem

Dear All,

I am New to this forum and also new to linux. I am facing some problem on DMRAID at my university assignment. My task is to implement a system REHL 5.4 O/S with RAID1(mirror) and then install oracle 11gi on it. To check Fail Over and Fail Back. option both.

When i pull the data cable of /dev/sda in online mode. System is working. fine , then i reboot it. Its bois shows that raid is degraded but still bootable and system gets online with /dev/sdb.

Problem 1.
When i insert clean /dev/sda in system. It dont get mirror with /dev/sdb.

Please let me know the steps How to resync it.?

Problem 2.
When i pull the data cable of /dev/sdb in online mode. System is working. fine , then i reboot it. Its bois shows that raid status is unknown, not bootable and system do not get online with /dev/sda.

Please let me know Why it is not boot from /dev/sda (steps How to resync it).

Problem 3.
When i run command dmraid -ay -v it gives following error.
libdmraid-events-dos.so: cannot open shared object file: No such file or directory

I have mention below some configuration to better understanding of problem for you. It is a humble request to you. Please help me out from this problem.

My System hardware confirugation is mention below:
Intel Core 2 Quad Q9400 processor 2.50 GHz, 6 MB L2 cache, 1333 MHz FSB Featuring Core 2 Processor
Chipset Intel Q45 Express chipset. The Intel ICH10R/DO SATA mass storage controller with two 250 G/B hard disk installed.
Hard Disk :- /dev/sda WDC WD2500AAJS-6 Rev: 02.0
/dev/sbd WDC WD2500AAJS-6 Rev: 02.0

My System REHL 5.4 confirugation is mention below:

[root@Test ~]# uname -a
Linux Test 2.6.18-164.el5 #1 SMP Thu Sep 3 04:15:13 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
------------------------------------------------------------------------

[root@Test ~]# vi /etc/fstab
/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/VolGroup00/LogVol01 swap swap defaults 0 0
------------------------------------------------------------------------
[root@Test ~]# vi /etc/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
# initrd /initrd-version.img
#boot=/dev/mapper/isw_djifcjgcig_RD1

default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Enterprise Linux (2.6.18-164.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-164.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
initrd /initrd-2.6.18-164.el5.img
------------------------------------------------------------------------

[root@Test ~]# dmraid -V
dmraid version: 1.0.0.rc13-17 (2008.12.03) debug
dmraid library version: 1.0.0.rc13-17 (2009.06.10)
device-mapper version: 4.11.5
------------------------------------------------------------------------

[root@Test ~]# dmraid -s
*** Group superset isw_djifcjgcig
--> Active Subset
name : isw_djifcjgcig_RD1
size : 486539264
stride : 128
type : mirror
status : ok
subsets: 0
devs : 2
spares : 0
------------------------------------------------------------------------
[root@Test mapper]# fdisk isw_djifcjgcig_RD1

Disk isw_djifcjgcig_RD1: 249.1 GB, 249108103168 bytes
255 heads, 63 sectors/track, 30285 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
isw_djifcjgcig_RD1p1 * 1 13 104391 83 Linux
isw_djifcjgcig_RD1p2 14 30285 243159840 8e Linux LVM
------------------------------------------------------------------------

[root@Test ~]# dmraid -ay -v
RAID set "isw_djifcjgcig_RD1" already active
device "isw_djifcjgcig_RD1" is now registered with dmeventd for monitoring
INFO: Activating GROUP raid set "isw_djifcjgcig"
RAID set "isw_djifcjgcig_RD1p1" already active
The dynamic shared library "libdmraid-events-dos.so" could not be loaded:
libdmraid-events-dos.so: cannot open shared object file: No such file or directory
INFO: Activating partition raid set "isw_djifcjgcig_RD1p1"
RAID set "isw_djifcjgcig_RD1p2" already active
The dynamic shared library "libdmraid-events-dos.so" could not be loaded:
libdmraid-events-dos.so: cannot open shared object file: No such file or directory
INFO: Activating partition raid set "isw_djifcjgcig_RD1p2"
------------------------------------------------------------------------
[root@Test ~]# rpm -qa | grep dmraid | sort
dmraid-1.0.0.rc13-53.el5
dmraid-events-1.0.0.rc13-53.el5
------------------------------------------------------------------------

[root@Test ~]# rpm -ql dmraid-1.0.0.rc13-53.el5
/sbin/dmraid
/sbin/dmraid.static
/usr/lib64/libdmraid-events-isw.so
/usr/lib64/libdmraid-events-isw.so.1.0.0.rc13
/usr/lib64/libdmraid-events-isw.so.1.0.0.rc13-17
/usr/lib64/libdmraid.so
/usr/lib64/libdmraid.so.1.0.0.rc13
/usr/lib64/libdmraid.so.1.0.0.rc13-17
------------------------------------------------------------------------

[root@Test ~]# dmraid -tay
isw_djifcjgcig_RD1: 0 486539264 mirror core 3 131072 nosync block_on_error 2 /dev/sda 0 /dev/sdb 0
isw_djifcjgcig_RD1p1: 0 208782 linear /dev/mapper/isw_djifcjgcig_RD1 63
isw_djifcjgcig_RD1p2: 0 486319680 linear /dev/mapper/isw_djifcjgcig_RD1 208845
------------------------------------------------------------------------
Thanks