偶尔（每60次启动中会有1次），我们的一台debian（2.6.32-45）服务器无法启动：
启动失败的输出到此结束：
...
[ 7.831991] raid6: using algorithm sse2x4 (11665 MB/s)
[ 7.839760] md: raid6 personality registered for level 6
[ 7.839838] md: raid5 personality registered for level 5
[ 7.839915] md: raid4 personality registered for level 4
[ 7.853452] md: raid10 personality registered for level 10 <<<<<<< last line of output
将其与“良好”启动时的 dmesg 日志进行比较：
...
[ 7.737313] md: raid6 personality registered for level 6
[ 7.737314] md: raid5 personality registered for level 5
[ 7.737315] md: raid4 personality registered for level 4
[ 7.749987] md: raid10 personality registered for level 10 <<<<<<<< equivalent line
[ 7.752653] mdadm: sending ioctl 1261 to a partition!
[ 7.752655] mdadm: sending ioctl 1261 to a partition!
[ 7.753571] mdadm: sending ioctl 1261 to a partition!
[ 7.753574] mdadm: sending ioctl 1261 to a partition!
[ 7.753769] mdadm: sending ioctl 1261 to a partition!
[ 7.753771] mdadm: sending ioctl 1261 to a partition!
[ 7.753975] mdadm: sending ioctl 1261 to a partition!
[ 7.753978] mdadm: sending ioctl 1261 to a partition!
[ 7.754322] mdadm: sending ioctl 1261 to a partition!
[ 7.754325] mdadm: sending ioctl 1261 to a partition!
...
我假设挂起是由于“mdadm：向分区发送 ioctl 1261！”引起的。但我该怎么做才能进一步调查这个问题呢？
答案1
mdadm: sending ioctl 1261 to a partition!
此警告可以忽略，它显示在较新的版本中已被删除。也许您遇到了磁盘故障，但与此消息无关
答案2
我们已经将问题定位到 RAID1 和 RAID10 模块。此问题已在后续的 Debian 版本中修复。
提交在这里： https://github.com/torvalds/linux/commit/d6b42dcb995e6acd7cc276774e751ffc9f0ef4bf