/Var becomes a read-only system solution

Background:

One of the rsync server suddenly has a problem, the client cannot rsync file in the past, log on to the servers to view, found/var becomes read-only, all files can not write to it, resulting in unable to write to the log, and restart the service is also said that the disk is read-only; var after a number of operations (Fsck/remount), will not be able to change the partition to RW, dead and alive are read-only, and viewing DMESG There are many error messages: SCSI error: <0 0 0 0> return code = 0x8000002 Info fld=0x16e5296, Deferred sda:sense key Hardware Error, the general processing method is to comment out the paragraph in/etc/fstab, and then reboot again remount, but due to the particularity of the server, Afraid of restarting after restarting and affect the business, so take the following methods to solve:

[[email protected] /] #mkdir  /home1/bak/varbackup[[email protected] /] #mount  -- move /var /home1/bak/varbackup[[email protected] /] #rm  -rf /var [[email  protected] /] #cd  /[[email protected] /] #mkdir  -p /home1/bak/var[[email  protected] /] #ln  -s /home1/bak/var  /var[[email protected] /] #cp  -r /home1/bak/varbackup/* /var/modifying/etc/fstab:[[email protected] /]# cat / Etc/fstablabel=/ / ext3 defaults 1 1label=/boot /boot ext3 defaults  1 2none /dev/pts devpts gid=5,mode=620  0 0none /dev/shm  tmpfs defaults 0 0label=/home /home ext3    defaults         1 2label=/home1 /home1 ext3    defaults         1 2label=/home2 /home2 ext3    defaults         1 2LABEL=/home3 /home3 ext3    defaults         1 2LABEL=/data2 /data2 ext3     defaults        0 0none /proc proc     defaults        0 0none /sys sysfs    defaults        0 0LABEL=/tmp /tmp ext3     defaults        1 2LABEL=/usr /usr  ext3    defaults        1 2#label=/var / var ext3    defaults        1 2label=/ var /home1/bak/var Ext3    defaults        1 2label=swap-sda3  swap swap    defaults        0 0/ dev/hda /media/cdrom auto    pamconsole,exec,noauto,managed 0 0/dev/ Fd0 /media/floppy auto    pamconsole,exec,noauto,managed 0 0

Modify the Fstab, so that the server can restart normally, and can mount/Var, at this time the original related services restart, restart success,/var becomes readable and writable.

At this point, use Mount to view:

[[email protected] bak]# mount /dev/sda2 on / type ext3  (rw) None  on /proc type proc  (rw) none on /sys type sysfs  (rw) None  on /dev/pts type devpts  (rw,gid=5,mode=620) usbfs on /proc/bus/usb  type usbfs  (rw)/dev/sda1 on /boot type ext3  (rw) NONE ON /DEV/SHM  type tmpfs  (rw)/dev/sda8 on /home type ext3  (rw)/dev/sdb1 on  /home1 type ext3  (rw)/dev/sdc1 on /home2 type ext3  (rw)/dev/sdd1  on /home3 type ext3  (rw)/dev/sda5 on /tmp type ext3  (rw)/ dev/sda6 on /usr type ext3  (rw) none on /proc/sys/fs/binfmt_misc type  binfmt_misc  (rw) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs  (rw)/dev /sde1 on /data2 type ext3  (rw)/home1/bak/var on /home1/bak/varbackup type none  (rw) 

The problematic partition is already blocked, and/Var is already using the new partition.

Mount move parameter: Move a subtree to some.

Starting with the Linux 2.5.1, you can move a subtree to another location in its entirety. The method that is called is

Mount--move Olddir Newdir

This does not affect the system's mount service.

This article is from the "Meditation Trip" blog, please be sure to keep this source http://shen445122.blog.51cto.com/6716303/1717755

/Var becomes a read-only system solution