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NAS_IP:/sysidc 表示NAS的存儲(chǔ)設(shè)備。
[root@mvxl0280 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 22G 20G 275M 99% /
tmpfs 7.8G 0 7.8G 0% /dev/shm
/dev/sda1 485M 37M 423M 9% /boot
/dev/mapper/vg_01-lv_01 98G 72G 21G 78% /eam_app
NAS_IP:/sysidc 3.0T 2.2T 743G 76% /mnt
## mount命令不加參數(shù)顯示的結(jié)果和/etc/mtab文件記錄內(nèi)容一樣。
[root@mvxl0280 /]# mount
/dev/mapper/VolGroup-lv_root 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)
/dev/sda1 on /boot type ext4 (rw)
/dev/mapper/vg_01-lv_01 on /eam_app type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
NAS_IP:/sysidc on /mnt type nfs (rw,addr=NAS_IP)
[root@mvxl0280 /]# 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=8157104k,nr_inodes=2039276,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/mapper/VolGroup-lv_root / ext4 rw,relatime,barrier=1,data=ordered 0 0
/proc/bus/usb /proc/bus/usb usbfs rw,relatime 0 0
/dev/sda1 /boot ext4 rw,relatime,barrier=1,data=ordered 0 0
/dev/mapper/vg_01-lv_01 /eam_app ext4 rw,relatime,barrier=1,data=ordered 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=2080,timeout=300,minproto=5,maxproto=5,indirect 0 0
-hosts /net autofs rw,relatime,fd=13,pgrp=2080,timeout=300,minproto=5,maxproto=5,indirect 0 0
NAS_IP:/sysidc /mnt nfs rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.16.17.171,mountvers=3,mountport=1234,mountproto=udp,local_lock=none,addr=NAS_IP 0 0
umount NAS存儲(chǔ)提示【No space left on device】
[root@mvxl0280 ~]# umount /mnt
can't create lock file /etc/mtab~9811: No space left on device (use -n flag to override)
/mnt was not found in /proc/mounts
NAS空間突然變小,從3.0T變成22G,其實(shí)此時(shí)看到的/mnt雖然掛載點(diǎn)是NAS“NAS_IP:/sysidc”,但其實(shí)是“/”目錄的掛載點(diǎn)。
[root@mvxl0280 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 22G 20G 346M 99% /
tmpfs 7.8G 0 7.8G 0% /dev/shm
/dev/sda1 485M 37M 423M 9% /boot
/dev/mapper/vg_01-lv_01 98G 72G 21G 78% /eam_app
NAS_IP:/sysidc 22G 20G 346M 99% /mnt
其實(shí)umount執(zhí)行之后,NAS存儲(chǔ)實(shí)際已經(jīng)成功umount,通過查看/mnt目錄就知道已經(jīng)是空的。
[root@mvxl0280 ~]# ls -l /mnt
total 0
貌似是沒有卸載成功,但是此時(shí)再執(zhí)行一次帶【-f】的umount,依然報(bào)錯(cuò)。
[root@mvxl0280 ~]# umount -f /mnt
/mnt was not found in /proc/mounts
/mnt was not found in /proc/mounts
重新mount NAS存儲(chǔ)也提示【No space left on device】
[root@mvxl0280 /]# mount NAS_IP:/sysidc /mnt
can't create lock file /etc/mtab~10608: No space left on device (use -n flag to override)
網(wǎng)上說可以用umount的【-l】參數(shù),其實(shí)也沒有效果。
[root@mvxl0280 /]# umount -l /mnt/
can't create lock file /etc/mtab~10512: No space left on device (use -n flag to override)
can't create lock file /etc/mtab~10513: No space left on device (use -n flag to override)
但是mount可以查看到NAS存儲(chǔ)“NAS_IP:/sysidc”已經(jīng)掛載在/mnt下。
[root@mvxl0280 ~]# mount
/dev/mapper/VolGroup-lv_root 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)
/dev/sda1 on /boot type ext4 (rw)
/dev/mapper/vg_01-lv_01 on /eam_app type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
NAS_IP:/sysidc on /mnt type nfs (rw,addr=NAS_IP)
而/proc/mounts【/proc/self/mounts的軟連接】卻看不到掛載點(diǎn)信息,因此報(bào)錯(cuò)【/mnt was not found in /proc/mounts】。
[root@mvxl0280 ~]# ls -l /proc/mounts
lrwxrwxrwx 1 root root 11 Feb 5 09:06 /proc/mounts -> self/mounts
[root@mvxl0280 ~]# file /proc/mounts
/proc/mounts: symbolic link to `self/mounts'
[root@mvxl0280 ~]# ls -l /proc/self
lrwxrwxrwx 1 root root 64 Feb 5 08:57 /proc/self -> 9879
[root@mvxl0280 ~]# ls -l /proc/self/mounts
-r--r--r-- 1 root root 0 Feb 5 09:07 /proc/self/mounts
[root@mvxl0280 ~]# more /proc/self/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=8157104k,nr_inodes=2039276,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/mapper/VolGroup-lv_root / ext4 rw,relatime,barrier=1,data=ordered 0 0
/proc/bus/usb /proc/bus/usb usbfs rw,relatime 0 0
/dev/sda1 /boot ext4 rw,relatime,barrier=1,data=ordered 0 0
/dev/mapper/vg_01-lv_01 /eam_app ext4 rw,relatime,barrier=1,data=ordered 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=2080,timeout=300,minproto=5,maxproto=5,indirect 0 0
-hosts /net autofs rw,relatime,fd=13,pgrp=2080,timeout=300,minproto=5,maxproto=5,indirect 0 0
經(jīng)過對(duì)比分析,發(fā)現(xiàn)是“/”根目錄空間不足導(dǎo)致,而使用空間最多是一個(gè)/home/wasadmin/deploy的程序備份目錄,在跟開發(fā)人員確認(rèn)之后,這個(gè)目錄下的程序文件是定期備份,但是沒有部署相關(guān)的定期清理腳本,而導(dǎo)致空間被用完。
[root@mvxl0280 home]# du -sh *
60K monitor
13G wasadmin
/home/wasadmin是用戶的home目錄,使用13G空間,而該目錄下只有2個(gè)常規(guī)目錄。其中client_ffdc這個(gè)目錄才204K。那么deploy占用了剩余的其他12G多的空間。
[root@mvxl0280 home]# cd wasadmin
[root@mvxl0280 wasadmin]# ls
client_ffdc deploy
[root@mvxl0280 wasadmin]# du -sh client_ffdc/
204K client_ffdc/
在刪除/home/wasadmin/deploy目錄下的部分備份程序之后,“/”目錄的空間已經(jīng)足夠,再次執(zhí)行umount NAS的命令,可以成功執(zhí)行。
[wasadmin@mvxl0280 ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 22G 8.9G 12G 45% /
tmpfs 7.8G 0 7.8G 0% /dev/shm
/dev/sda1 485M 37M 423M 9% /boot
/dev/mapper/vg_01-lv_01 98G 68G 26G 73% /eam_app
NAS_IP:/sysidc 3.0T 2.2T 743G 76% /mnt
[root@mvxl0280 wasadmin]# umount /mnt
[root@mvxl0280 wasadmin]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 22G 8.9G 12G 45% /
tmpfs 7.8G 0 7.8G 0% /dev/shm
/dev/sda1 485M 37M 423M 9% /boot
/dev/mapper/vg_01-lv_01 98G 68G 26G 73% /eam_app
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