hwclock
RTC_RD_TIME: Inappropriate ioctl for device
ioctl() to /dev/rtc to read the time failed
今早一台服务器故障，后来有空上来查看故障日志，未果，发现时间不对，如下：
[root@cache06 ~]# hwclock -w Cannot access the Hardware Clock via any known method. Use the --debug option to see the details of our search for an access method. [root@cache06 ~]# hwclock --debug hwclock from util-linux-2.13-pre7 hwclock: Open of /dev/rtc failed, errno=19: No such device. No usable clock interface found. Cannot access the Hardware Clock via any known method. [root@cache06 ~]# ls -l /dev/rtc rtc rtc0
通过查找资料发现是因为升级内核是没有加载相应的时间模块导致，可用升级hwclock的方式解决，于是如下：
wget https://www.kernel.org/pub/linux/utils/util-linux/v2.27/util-linux-2.27.tar.gz tar xzvf util-linux-2.27.tar.gz cd util-linux-ng-2.27 ./configure make make install cp hwclock/hwclock /sbin/
解决二
cd /dev/ && mknod rtc1 c 254 0 && ln -s /dev/rtc1 /dev/rtc
hwclock –show –rtc=/dev/rtc1
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