mtab，使分区不能显示在df，挂载列表中

我在RHEL 6上。我使用parted创build了一些分区，使用mke2fs对它们进行了格式化，并使用mount进行了挂载。我也将它们添加到/ etc / fstab。但是，它们不会显示在挂载或df列表中。

$ df -h Filesystem Size Used Avail Use% Mounted on /dev/vda1 20G 1.9G 17G 10% / tmpfs 58G 0 58G 0% /dev/shm $ mount /dev/vda1 on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw) $ cat /etc/mtab /dev/vda1 / ext4 rw 0 0 proc /proc proc rw 0 0 sysfs /sys sysfs rw 0 0 devpts /dev/pts devpts rw,gid=5,mode=620 0 0 tmpfs /dev/shm tmpfs rw 0 0 none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0 sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0

但是，分区显示为挂载在/ proc / mounts中：

 $ cat /proc/mounts rootfs / rootfs rw 0 0 proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0 sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 devtmpfs /dev devtmpfs rw,nosuid,relatime,size=60487100k,nr_inodes=15121775,mode=755 0 0 devpts /dev/pts devpts rw,relatime,gid=5,mode=620,ptmxmode=000 0 0 tmpfs /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0 /dev/vda1 / ext4 rw,relatime,barrier=1,data=ordered 0 0 /proc/bus/usb /proc/bus/usb usbfs rw,relatime 0 0 none /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0 sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0 /etc/auto.misc /misc autofs rw,relatime,fd=7,pgrp=2265,timeout=300,minproto=5,maxproto=5,indirect 0 0 -hosts /net autofs rw,relatime,fd=13,pgrp=2265,timeout=300,minproto=5,maxproto=5,indirect 0 0 /dev/vdb1 /mnt ext4 rw,relatime,barrier=1,data=ordered 0 0 /dev/vdc1 /disks/vdc1 ext4 rw,relatime,barrier=1,data=ordered 0 0 /dev/vdd1 /disks/vdd1 ext4 rw,relatime,barrier=1,data=ordered 0 0 /dev/vde1 /disks/vde1 ext4 rw,relatime,barrier=1,data=ordered 0 0 /dev/vdf1 /disks/vdf1 ext4 rw,relatime,barrier=1,data=ordered 0 0 /dev/vdg1 /disks/vdg1 ext4 rw,relatime,barrier=1,data=ordered 0 0 /dev/vdh1 /disks/vdh1 ext4 rw,relatime,barrier=1,data=ordered 0 0 /dev/vdi1 /disks/vdi1 ext4 rw,relatime,barrier=1,data=ordered 0 0 /dev/vdj1 /disks/vdj1 ext4 rw,relatime,barrier=1,data=ordered 0 0 /dev/vdk1 /disks/vdk1 ext4 rw,relatime,barrier=1,data=ordered 0 0

用上面的方法覆盖/ etc / mtab使得df可以工作：

 # cat /proc/mounts > /etc/mtab $ df -h Filesystem Size Used Avail Use% Mounted on rootfs 20G 1.9G 17G 10% / devtmpfs 58G 232K 58G 1% /dev tmpfs 58G 0 58G 0% /dev/shm /dev/vda1 20G 1.9G 17G 10% / /dev/vdb1 2.7T 202M 2.6T 1% /mnt /dev/vdc1 2.7T 201M 2.6T 1% /disks/vdc1 /dev/vdd1 2.7T 201M 2.6T 1% /disks/vdd1 /dev/vde1 2.7T 201M 2.6T 1% /disks/vde1 /dev/vdf1 2.7T 201M 2.6T 1% /disks/vdf1 /dev/vdg1 2.7T 201M 2.6T 1% /disks/vdg1 /dev/vdh1 2.7T 201M 2.6T 1% /disks/vdh1 /dev/vdi1 2.7T 201M 2.6T 1% /disks/vdi1 /dev/vdj1 2.7T 201M 2.6T 1% /disks/vdj1 /dev/vdk1 2.7T 201M 2.6T 1% /disks/vdk1

这移动了我直接的问题，但我仍然想知道为什么mount没有正确更新/ etc / mtab。有什么想法吗？

编辑：根据要求，输出fdisk -l：

 $ sudo fdisk -l Disk /dev/vda: 21.5 GB, 21474836480 bytes 43 heads, 16 sectors/track, 60963 cylinders Units = cylinders of 688 * 512 = 352256 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00054b77 Device Boot Start End Blocks Id System /dev/vda1 3 60964 20970496 83 Linux WARNING: GPT (GUID Partition Table) detected on '/dev/vdb'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vdb: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vdb1 1 267350 2147483647+ ee GPT WARNING: GPT (GUID Partition Table) detected on '/dev/vdc'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vdc: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vdc1 1 267350 2147483647+ ee GPT WARNING: GPT (GUID Partition Table) detected on '/dev/vdd'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vdd: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vdd1 1 267350 2147483647+ ee GPT WARNING: GPT (GUID Partition Table) detected on '/dev/vde'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vde: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vde1 1 267350 2147483647+ ee GPT WARNING: GPT (GUID Partition Table) detected on '/dev/vdf'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vdf: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vdf1 1 267350 2147483647+ ee GPT WARNING: GPT (GUID Partition Table) detected on '/dev/vdg'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vdg: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vdg1 1 267350 2147483647+ ee GPT WARNING: GPT (GUID Partition Table) detected on '/dev/vdh'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vdh: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vdh1 1 267350 2147483647+ ee GPT WARNING: GPT (GUID Partition Table) detected on '/dev/vdi'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vdi: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vdi1 1 267350 2147483647+ ee GPT WARNING: GPT (GUID Partition Table) detected on '/dev/vdj'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vdj: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vdj1 1 267350 2147483647+ ee GPT WARNING: GPT (GUID Partition Table) detected on '/dev/vdk'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/vdk: 3000.0 GB, 2999999004672 bytes 255 heads, 63 sectors/track, 364729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/vdk1 1 267350 2147483647+ ee GPT

在我发生了手动编辑/etc/mtab的错误之后，发生了这种情况。有一个原因，为什么每个手册存在说 – 只是不这样做:)编辑本身是无害的 – 我已经重新命名一个LVM卷组挂载的逻辑卷，并需要一个简单的更新其mtab条目，以便mount -a会停止报告虚假的错误。问题是我的编辑在/etc/mtab~留下了一个简单的备份文件。

所有mount(8)调用停止更新mtab ，并开始运行约30秒，这是相当可疑的。可悲的是，它甚至没有发出警告，花了strace弄清楚了这一点：

 % sudo strace mount /something [...] link("/etc/mtab~.10889", "/etc/mtab~") = -1 EEXIST (File exists) open("/etc/mtab~", O_WRONLY) = 3 [...] unlink("/etc/mtab~.10889") = 0 [...]

它在一个循环中完成了link()和open()调用，但是最终放弃了它的临时文件的unlink() 。