最近我在机器上安装了FreeBSD 10.1，多年以来FreeBSD 6.2都能正常工作。 由于机器位于数据中心，我通过串行控制台configuration了远程访问。

安装后，我在启动时遇到了一个奇怪的问题。 每次重新启动rootfs都不能挂载。

uhub4: 8 ports with 8 removable, self powered Trying to mount root from ufs:/dev/raid/r0p2 [rw]... mountroot: waiting for device /dev/raid/r0p2 ... Mounting from ufs:/dev/raid/r0p2 failed with error 19. Loader variables: vfs.root.mountfrom=ufs:/dev/raid/r0p2 vfs.root.mountfrom.options=rw Manual root filesystem specification: <fstype>:<device> [options] Mount <device> using filesystem <fstype> and with the specified (optional) option list. eg. ufs:/dev/da0s1a zfs:tank cd9660:/dev/acd0 ro (which is equivalent to: mount -t cd9660 -o ro /dev/acd0 /) ? List valid disk boot devices . Yield 1 second (for background tasks) <empty line> Abort manual input mountroot> 

但当我按下input键（通过连接键盘或串行控制台），我可以看到以下，系统重新启动就好了

 mountroot> panic: mountroot: unable to (re-)mount root. cpuid = 0 KDB: stack backtrace: #0 0xffffffff80963000 at kdb_backtrace+0x60 #1 0xffffffff80928125 at panic+0x155 #2 0xffffffff809c554f at vfs_mountroot+0x1eaf #3 0xffffffff808d7533 at start_init+0x53 #4 0xffffffff808f8b6a at fork_exit+0x9a #5 0xffffffff80d0acbe at fork_trampoline+0xe Uptime: 12s Automatic reboot in 15 seconds - press a key on the console to abort 

现在系统重新启动，一切顺利

• 什么是Microsoft iSCSI启动器目标限制？
• 检查磁盘是否处于睡眠状态（FreeNAS）
• SATA驱动器和RAID控制器推荐FreeNAS
• 在FreeBSD上添加IP故障转移
• 将文件移出卷，然后再保留所有属性？

 Trying to mount root from ufs:/dev/raid/r0p2 [rw]... Setting hostuuid: 530c9cf5-a7e5-11e4-97b5-00e08146563c. Setting hostid: 0xe4218f4f. Entropy harvesting: interrupts ethernet point_to_point swi. Starting file system checks: /dev/raid/r0p2: FILE SYSTEM CLEAN; SKIPPING CHECKS /dev/raid/r0p2: clean, 7232943 free (983 frags, 903995 blocks, 0.0% fragmentation) /dev/raid/r1s1f: FILE SYSTEM CLEAN; SKIPPING CHECKS /dev/raid/r1s1f: clean, 41630678 free (104646 frags, 5190754 blocks, 0.1% fragmentation) /dev/raid/r0p4: FILE SYSTEM CLEAN; SKIPPING CHECKS /dev/raid/r0p4: clean, 49146170 free (8498 frags, 6142209 blocks, 0.0% fragmentation) Mounting local file systems:. Writing entropy file:. 

我只是想，如果系统自动重新启动，当它无法挂载根（我猜是由于内核恐慌），我可以让这个系统工作正常，它只会重新启动两次。

我发现类似的线程，但有关的Linux，我可以设置/ etc / sysctlvariables，并有系统内核恐慌autoreboot

 kernel.panic = 20 

内核恐慌后自动重启

它似乎并没有在FreeBSD上工作。 我的问题是，有没有办法让我的系统能够在rootfs无法挂载时自动重启？ 我希望它可能会重新启动并在第二次运行上挂载根就好了？

我也会很感激任何其他的build议。

谢谢

注释1：

我被要求从服务器设置输出一些数据，这里是：

 nn@d02:~ % uname -a FreeBSD hostname 10.1-RELEASE-p19 FreeBSD 10.1-RELEASE-p19 #0: Sat Aug 22 03:55:09 UTC 2015 [email protected]:/usr/obj/usr/src/sys/GENERIC amd64 nn@d02:~ % freebsd-version -k 10.1-RELEASE-p19 nn@d02:~ % freebsd-version -u 10.1-RELEASE-p19 nn@d02:~ % gpart show => 34 488390589 raid/r0 GPT (233G) 34 1024 1 freebsd-boot (512K) 1058 62914560 2 freebsd-ufs (30G) 62915618 8388608 3 freebsd-swap (4.0G) 71304226 417086396 4 freebsd-ufs (199G) 488390622 1 - free - (512B) => 63 488390593 raid/r1 MBR (233G) 63 488375937 1 freebsd [active] (233G) 488376000 14656 - free - (7.2M) => 0 488375937 raid/r1s1 BSD (233G) 0 1048576 1 freebsd-ufs (512M) 1048576 8324192 2 freebsd-swap (4.0G) 9372768 6258688 4 freebsd-ufs (3.0G) 15631456 1048576 5 freebsd-ufs (512M) 16680032 471695905 6 freebsd-ufs (225G) nn@d02:~ % graid show graid: Unknown command: show. nn@d02:~ % graid status Name Status Components raid/r0 OPTIMAL ada0 (ACTIVE (ACTIVE)) ada1 (ACTIVE (ACTIVE)) raid/r1 OPTIMAL ada2 (ACTIVE (ACTIVE)) ada3 (ACTIVE (ACTIVE))