[AIX][Certification] 请教一个题目

chao_ping

While using the smit install menus to install an LPP, the response \"yes\" has been selected for the option: EXTEND file systems if space needed. After successfully installing the LPP, the /usr filesystem appears to be unnecessarily large. Which of the following actions can be performed to reduce the size of the /usr filesystem? \r\n\r\n1。 Backup, unmount, remove, recreate and restore the filesystem. \r\n2。Unmount, run defragfs /usr and the reducefs -size XXX /usr commands. \r\n3。Boot from mksysb tape and follow the procedure to reduce the filesystem. \r\n4。Update /etc/filesystems with the desired size for /usr and reboot the system\r\n\r\n如果是普通文件系统，答案肯定是A。\r\n但是是/usr就不行吗？只能从makesysb的备份来恢复？\r\n我看一些逻辑卷文件系统管理命令倒确实都是在/usr/sbin下面，但是我可以先拷贝倒/目录也可以啊？\r\n

larryh

问题是，那些命令还要调用其他命令，很多本身只是一个shell脚本，而被调用的命令基本都指向/usr。如果要复制到其他地方，比如/usrback，还要把所有的脚本找出来，把里面的/usr替换成/usrback。/usr下面还有Predefined ODM等等，就是说，rootvg还要有足够的空间把所有/usr备份下来。前提要求太多也太难了吧。