Mounting and File Checking

Mounting is the attaching of an additional file system to the currently accessible file-system of a computer.

#mount to view all mounted devices in a system. User can see the mounted device all in /etc/fstab.

If user want to mount a formated partition, first has to create a mount point,

#mkdir {/disk1}

#mount /dev/{sda1,2,3..} /disk1

#df /disk1 To check the mounted device. Mounted device will be stored in /etc/mtab.

To ensure that the system mounts the new file systems at boot time, need to add a line for each one to /etc/fstab

#nano /etc/fstab 

Each line lists, as required, the name of the device, mounting point, file system type, dump and pass bit.

/dev/sr0     /media/cdrom0  udf,iso9660    user,noauto    0 0

/dev/sda5    /home               ext3      nouser,auto    0 2  

Pass bit is the count, on every 25 mounting process the file system will be checked for fsck. User can change the checking by changing the maximum mount count.

#tune2fs -c {value} /dev/{sda1,2,3..}, If the value set to 0 or -1 the file system will not check.

User can run fsck command on file system to make sure they created properly or error checking in file system. Don't use this command on mounted device, device must unmounted and use the command.

#umount /dev/{sda1,2,3..}

Now can check the file-system:

#fsck dev/{sda1,2,3..}, here the problem is by default fsck will take the file system as ext3, to avoid this, user can mention which file system need to check.

#fsck -t zfs /dev/{sda1,2,3..}

There is also a problem that through above command will go and check the last checked register not check the full file system, to overcome this we can forcefully check the file system.

#fsck -ft zfs /dev/{sda1,2,3..}

Sometimes user need to check the space where user stands, eg: if user need to check the primary partition where the operating system files located. This has to be done only in Run level 1 – /etc/rc.d/rc1.d/ (Single user mode).

#init 1

#umount /dev/sda1 here actually we virtually moving our location to RAM.

#fsck -ft zfs /dev/{sda1}