Redhat AS升级奇怪故障！

Redhat AS2。1升级到AS3时，碰到了一个奇怪得故障！
原来系统安装在仅有得硬盘（/dev/sdb上），安装升级程序居然认成了/dev/sda，一时无法正常完成安装，在此时需临时mount已变成/dev/sda得根分区，修改/etc/fatab然后再完成安装。
装完系统后，启动时硬盘居然又变回来了:-( FT 没办法，只能进grub得编辑状态编辑，然后启动系统，改回/etc/fstab!

对于这个问题得成因百思不得。

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