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Restart the application server failed while the SUSE 10 SP2 reading and writing the LUN

Publication Date:  2012-11-22 Views:  31 Downloads:  0
Issue Description
While reading and writing the LUN, restart up the application server, the process of the powering off has been terminated and prompt:
umount:/:device is busy  Oops:umount failed  mount::/ is busy  umount:/proc:device is busy  Please stand by while rebooting the system…

Alarm Information
None
Handling Process
We suggest taking the following measure to avoid this problem:
1. Take the following two methods to add the iSCSI service as to the system service.
# chkconfig --add open-iscsi
Execute the following command to build a link which is guided to the “/etc/init.d/open-iscsi” script in the “/etc/init.d/rc5.d/” catalog.
ln -sfn /etc/init.d/open-iscsi /etc/init.d/rc5.d/S06open-iscsi
ln -sfn /etc/init.d/open-iscsi /etc/init.d/rc5.d/K16open-iscsi

2. View the “/etc/init.d/rc5.d” file. Execute: # ls/etc/init.d/rc5.d/
K05cron           K11splash       S01fbset          S11powersaved
K05xinetd         K11sshd         S01jexec          S11qlremote
K07libvirtd        K14nfs          S01random         S11raw
K07oracle         K14nfsboot       S01resmgr         S11running-kernel
K07postfix        K14smbfs        S02haldaemon      S11splash
K07xendomains    K15auditd        S05network        S11sshd
K08cups          K15portmap      S06open-iscsi       S13o2cb
K08nscd          K15splash_early   S06owcimomd      S13slpd
K08ocfs2          K16open-iscsi    S06syslog          S14cups
K08suseRegister    K16owcimomd    S07auditd         S14nscd
K08xend          K16syslog        S07portmap        S14ocfs2
K09o2cb          K17network       S07splash_early    S14suseRegister
K09slpd           K20haldaemon    S07ultrapath       S14xend
K11alsasound       K21acpid        S08nfs            S15libvirtd
K11irq_balancer     K21dbus        S08nfsboot         S15oracle
K11microcode       K21fbset        S08smbfs          S15postfix
K11novell-zmd      K21jexec        S11alsasound       S15xendomains
K11powersaved      K21random      S11irq_balancer    S17cron
K11qlremote        K21resmgr       S11kbd           S17xinetd
K11raw             S01acpid       S11microcode
K11running-kernel    S01dbus        S11novell-zmd

Root Cause
1. View the “/etc/inittab” file, and validate if the system has run in the 5 level (the multiple user mode attached the GUI).
2. View the “/etc/init.d/rc5.d” file, validate the system has linked the corresponding service while closing and starting.
# ls/etc/init.d/rc5.d/
K05cron          K11running-kernel    S01dbus          S11powersaved
K05xinetd         K11splash          S01fbset          S11qlremote
K07libvirtd        K11sshd            S01jexec         S11raw
K07oracle         K14nfs             S01random       S11running-kernel
K07postfix        K14nfsboot          S01resmgr        S11splash
K07xendomains    K14smbfs           S02haldaemon     S11sshd
K08cups          K15auditd           S05network       S13o2cb
K08nscd          K15portmap         S06owcimomd     S13slpd
K08ocfs2         K15splash_early      S06syslog         S14cups
K08suseRegister   K16owcimomd      S07auditd         S14nscd
K08xend          K16syslog          S07portmap        S14ocfs2
K09o2cb          K17network         S07splash_early    S14suseRegister
K09slpd          K20haldaemon       S08nfs            S14xend
K11alsasound     K21acpid           S08nfsboot         S15libvirtd
K11irq_balancer   K21dbus            S08smbfs          S15oracle
K11microcode     K21fbset            S11alsasound       S15postfix
K11novell-zmd    K21jexec            S11irq_balancer     S15xendomains
K11powersaved    K21random          S11kbd            S17cron
K11qlremote      K21resmgr           S11microcode       S17xinetd
K11raw          S01acpid            S11novell-zmd       S99ultrapath

Where, S denotes the script will be implemented as the “start” parameter while the system is starting (if the link begins as K, it denotes the script will be implemented as the “stop” parameter while the system is closing), as the “” for example, the following command will be implemented while the system is starting:
# /etc/init.d/rc5.d /S17xinetd start
During the system is powering off, the services which begins as K are closed as the turn of their capacity from the small to the big.
Hence, we conclude:
Because the iSCSI service depends on the network service, while powering off the system, the system will close the network service before close the iSCSI service, but at this time, the application server is reading and writing the LUN and there is transmitting the data package, so it causes the process off powering off is terminated, and appears the above information.

Suggestions
Before powering off, we suggest closing the iSCSI service or add the iSCSI service as to the system service.


END