RedFlagDC5.0Sp2上的iscsi问题

    今天接到用户的保障，据说是iscsi无法自动挂载，而且重启iscsi服务之后，识别的的四个iscsi设备，第一个sdb不变，第二、三、四个iscsi设备会变化，如下用来说明

默认情况下：

[root@localhost sbin]# ./fdisk -l

Disk /dev/sda: 146.6 GB, 146695782400 bytes
255 heads, 63 sectors/track, 17834 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 10212 81923467+ 83 Linux
/dev/sda3 10213 11232 8193150 82 Linux swap
/dev/sda4 11233 17834 53030565 5 Extended
/dev/sda5 11233 12507 10241406 83 Linux
/dev/sda6 12508 17834 42789096 83 Linux

Disk /dev/sdb: 104.8 GB, 104857600000 bytes
255 heads, 63 sectors/track, 12748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 12748 102398278+ 83 Linux

Disk /dev/sdc: 104.8 GB, 104857600000 bytes
255 heads, 63 sectors/track, 12748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdc1 1 12748 102398278+ 83 Linux

Disk /dev/sdd: 104.8 GB, 104857600000 bytes
255 heads, 63 sectors/track, 12748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdd1 1 12748 102398278+ 83 Linux

Disk /dev/sde: 209.7 GB, 209715200000 bytes
255 heads, 63 sectors/track, 25496 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sde1 1 25496 204796588+ 83 Linux

重启服务后：


[root@localhost sbin]# ./fdisk -l

Disk /dev/sda: 146.6 GB, 146695782400 bytes
255 heads, 63 sectors/track, 17834 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 10212 81923467+ 83 Linux
/dev/sda3 10213 11232 8193150 82 Linux swap
/dev/sda4 11233 17834 53030565 5 Extended
/dev/sda5 11233 12507 10241406 83 Linux
/dev/sda6 12508 17834 42789096 83 Linux

Disk /dev/sdb: 104.8 GB, 104857600000 bytes
255 heads, 63 sectors/track, 12748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 12748 102398278+ 83 Linux

Disk /dev/sdf: 104.8 GB, 104857600000 bytes
255 heads, 63 sectors/track, 12748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdf1 1 12748 102398278+ 83 Linux

Disk /dev/sdg: 104.8 GB, 104857600000 bytes
255 heads, 63 sectors/track, 12748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdg1 1 12748 102398278+ 83 Linux

Disk /dev/sdh: 209.7 GB, 209715200000 bytes
255 heads, 63 sectors/track, 25496 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdh1 1 25496 204796588+ 83 Linux

    从上面的内容显示，每重启一次iscsi服务，设备名会往后推。暂时想可能跟配置文件有关。
    另一个问题是iscsi服务无法自动挂载，打电话过去详细咨询了以下现象：以前是DC5.0单机跑，是可以自动挂载的，现在换成双机了，系统升级为DC5.0SP2之后，首先发现是不能自动挂载了，虽然修改了/etc/fstab.iscsi，但是就是不自动挂载。他还说了一句话“而且iscsi的mount和umount两个脚本也拷了”
    幸好我有DC5.0和SP2的环境，我隐隐约约感觉到“自动挂载”的问题原因在两个系统版本所在的iscsi包不同造成的。但是重启iscsi服务，设备名变还想不出什么来。幸好我提前咨询了一下，先让用户重启以下iscsi服务，然后把dmesg发过来，另外把所有的iscsi配置文件都发给我。
   
    开始分析DC5.0和SP2里面的iscsi包的问题，除了版本不同之外，还发现包内容也不同：

DC5.0自带的iscsi包内容：

[root@lvs191 /]# rpm -ql iscsi
/etc/fstab.iscsi
/etc/initiatorname.iscsi
/etc/iscsi.conf
/etc/rc.d/init.d/iscsi
/sbin/iscsi-device
/sbin/iscsi-iname
/sbin/iscsi-ls
/sbin/iscsi-mountall
/sbin/iscsi-umountall
/sbin/iscsid
/usr/share/doc/iscsi-4.0.1.11
/usr/share/doc/iscsi-4.0.1.11/COPYING
/usr/share/doc/iscsi-4.0.1.11/README
/usr/share/man/man1/iscsi-ls.1.gz
/usr/share/man/man5/iscsi.conf.5.gz
/usr/share/man/man8/iscsid.8.gz


DC5.0SP2自带的iscsi包内容：

[root@lvs191 ~]# rpm -ql iscsi
/etc/fstab.iscsi
/etc/initiatorname.iscsi
/etc/iscsi.conf
/etc/rc.d/init.d/iscsi
/etc/sysconfig/iscsi
/sbin/iscsi-device
/sbin/iscsi-iname
/sbin/iscsi-ls
/sbin/iscsi-rescan
/sbin/iscsid
/usr/share/doc/iscsi-4.0.3.0
/usr/share/doc/iscsi-4.0.3.0/COPYING
/usr/share/doc/iscsi-4.0.3.0/README
/usr/share/man/man1/iscsi-ls.1.gz
/usr/share/man/man5/iscsi.conf.5.gz
/usr/share/man/man8/iscsid.8.gz


    很明显，两个系统中的iscsi包中有两个脚本的区别，/sbin/iscsi-mountall和/sbin/iscsi-umountall，从命令名来看，就猜到是挂载和卸载设备的。那么，最可能用到这两个命令的文件就是/etc/rc.d/init.d/iscsi，我在两个系统中对比这个文件。
    文件内容略。但是明显发现SP2里面这个文件内容更标准，里面多了几个函数，但是还少了一些内容。尤其少了对/etc/fstab.iscsi的判断，和/sbin/iscsi-mountall和/sbin/iscsi-umountall命令的使用。根据内容来看，我判断是SP2里面的iscsi取消了自动挂载这一步，不过我可以添加进去，实现自动挂载和卸载。修改为如下：

.........................................


# Make sure the K*iscsi scripts get called
        if [ -d /var/lock/subsys ] ; then
            touch /var/lock/subsys/iscsi
        fi

        # if we have an iSCSI fstab, process it
        if [ -f /etc/fstab.iscsi ] ; then
            echo -n " fsck/mount"
            sleep 6
            iscsi-mountall
        fi
 }

stop()

{
        ret=0
        echo -n "Stopping iscsid: "

        if ! pidofproc iscsid > /dev/null 2>&1; then
            success "iscsid not running"
            echo
            return 0
        fi

        # We need a low connfail_timeout so that driver shutdown does not hang
        set_connfailtimeout;
        set_aborttimeout;
        set_resettimeout;

        sync

# unmount all filesystems on iSCSI devices
        echo -n " umount"
        iscsi-umountall -t -k

        echo -n " sync"
        sync
        sleep 3

#        echo -n "Killing iscsid: "
        if ! killproc iscsid; then
            echo
            exit 1
        fi
        echo

...............................................


    应该问题不大。
    另一个问题：重启iscsi服务之后，iscsi设备名变化的问题，我想应该是iscsi模块没有从内核里面彻底卸载的问题所导致，再分析以下。

    自动挂载iscsi设备实现了。但是最后确认，即将安装RedFlag HA，一下午白忙活了。