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7

1

After adding a new mount point in /etc/fstab, we usually execute mount -a to reflect the change (if we want to bypass reboot), and df -kh output shows the new mount point.

How does mount -a work/impact already mounted partitions, which have reference to the /etc/fstab file?  Does it umount and then mount those partitions, or just ignore them since they are already mounted?

linux mount partition fstab

share|improve this question

edited Jun 15 at 4:11

G-Man

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asked Jun 14 at 10:54

RaufRauf

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• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Why do you usually run mount -a instead of just mount <thenewmountpoint>?
  
  – RonJohn
  Jun 15 at 4:11
  

  
  
  
  

add a comment
 | 

7

1

After adding a new mount point in /etc/fstab, we usually execute mount -a to reflect the change (if we want to bypass reboot), and df -kh output shows the new mount point.

How does mount -a work/impact already mounted partitions, which have reference to the /etc/fstab file?  Does it umount and then mount those partitions, or just ignore them since they are already mounted?

linux mount partition fstab

share|improve this question

edited Jun 15 at 4:11

G-Man

15.6k99 gold badges4545 silver badges8989 bronze badges

asked Jun 14 at 10:54

RaufRauf

5411 silver badge22 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Why do you usually run mount -a instead of just mount <thenewmountpoint>?
  
  – RonJohn
  Jun 15 at 4:11
  

  
  
  
  

add a comment
 | 

After adding a new mount point in /etc/fstab, we usually execute mount -a to reflect the change (if we want to bypass reboot), and df -kh output shows the new mount point.

How does mount -a work/impact already mounted partitions, which have reference to the /etc/fstab file?  Does it umount and then mount those partitions, or just ignore them since they are already mounted?

linux mount partition fstab

share|improve this question

edited Jun 15 at 4:11

G-Man

15.6k99 gold badges4545 silver badges8989 bronze badges

asked Jun 14 at 10:54

RaufRauf

5411 silver badge22 bronze badges

share|improve this question

edited Jun 15 at 4:11

G-Man

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asked Jun 14 at 10:54

RaufRauf

5411 silver badge22 bronze badges

share|improve this question

edited Jun 15 at 4:11

G-Man

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asked Jun 14 at 10:54

RaufRauf

5411 silver badge22 bronze badges

edited Jun 15 at 4:11

G-Man

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edited Jun 15 at 4:11

G-Man

15.6k99 gold badges4545 silver badges8989 bronze badges

asked Jun 14 at 10:54

RaufRauf

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asked Jun 14 at 10:54

RaufRauf

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3 Answers
3

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oldest

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14

It skips ones already mounted.

https://github.com/karelzak/util-linux/blob/master/sys-utils/mount.c#L185-L193

while (mnt_context_next_mount(cxt, itr, &fs, &mntrc, &ignored) == 0) 

 const char *tgt = mnt_fs_get_target(fs);

 if (ignored) 
 if (mnt_context_is_verbose(cxt))
 printf(ignored == 1 ? _("%-25s: ignoredn") :
 _("%-25s: already mountedn"),
 tgt);
 
 // ...

share|improve this answer

edited Jun 15 at 6:01

Henry Malinowski

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answered Jun 14 at 11:01

stevesteve

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add a comment
 | 

5

It will ignore already mounted partitions.

In the same time, you can do a mount -o remount /dev/xxx on a partition already mounted, this won't cause any problem even if users are using this partition

share|improve this answer

answered Jun 14 at 11:01

darxmurfdarxmurf

7191212 bronze badges

add a comment
 | 

0

The better option would be mount the new file system manually and add the new file system entry in the /etc/fstab to make sure this f/s get mounted on every reboot.

As mentioned above "mount -a" will ignore the already mounted file systems and mount only the file system which was not mounted yet (new file system).

Hope this will helps.

share|improve this answer

answered Jun 15 at 17:38

Prithvirajan BalakrishnanPrithvirajan Balakrishnan

5955 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I prefer "mount -a" option for a new file system rather than manually mount it. In this way, I'm also verifying if /etc/fstab entry is correct.
  
  – Rauf
  Jun 23 at 13:56
  

  
  
  
  

add a comment
 | 

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14

It skips ones already mounted.

https://github.com/karelzak/util-linux/blob/master/sys-utils/mount.c#L185-L193

while (mnt_context_next_mount(cxt, itr, &fs, &mntrc, &ignored) == 0) 

 const char *tgt = mnt_fs_get_target(fs);

 if (ignored) 
 if (mnt_context_is_verbose(cxt))
 printf(ignored == 1 ? _("%-25s: ignoredn") :
 _("%-25s: already mountedn"),
 tgt);
 
 // ...

share|improve this answer

edited Jun 15 at 6:01

Henry Malinowski

38822 silver badges66 bronze badges

answered Jun 14 at 11:01

stevesteve

15.1k22 gold badges2929 silver badges5757 bronze badges

add a comment
 | 

14

It skips ones already mounted.

https://github.com/karelzak/util-linux/blob/master/sys-utils/mount.c#L185-L193

while (mnt_context_next_mount(cxt, itr, &fs, &mntrc, &ignored) == 0) 

 const char *tgt = mnt_fs_get_target(fs);

 if (ignored) 
 if (mnt_context_is_verbose(cxt))
 printf(ignored == 1 ? _("%-25s: ignoredn") :
 _("%-25s: already mountedn"),
 tgt);
 
 // ...

share|improve this answer

edited Jun 15 at 6:01

Henry Malinowski

38822 silver badges66 bronze badges

answered Jun 14 at 11:01

stevesteve

15.1k22 gold badges2929 silver badges5757 bronze badges

add a comment
 | 

It skips ones already mounted.

https://github.com/karelzak/util-linux/blob/master/sys-utils/mount.c#L185-L193

while (mnt_context_next_mount(cxt, itr, &fs, &mntrc, &ignored) == 0) 

 const char *tgt = mnt_fs_get_target(fs);

 if (ignored) 
 if (mnt_context_is_verbose(cxt))
 printf(ignored == 1 ? _("%-25s: ignoredn") :
 _("%-25s: already mountedn"),
 tgt);
 
 // ...

share|improve this answer

edited Jun 15 at 6:01

Henry Malinowski

38822 silver badges66 bronze badges

answered Jun 14 at 11:01

stevesteve

15.1k22 gold badges2929 silver badges5757 bronze badges

while (mnt_context_next_mount(cxt, itr, &fs, &mntrc, &ignored) == 0) 

 const char *tgt = mnt_fs_get_target(fs);

 if (ignored) 
 if (mnt_context_is_verbose(cxt))
 printf(ignored == 1 ? _("%-25s: ignoredn") :
 _("%-25s: already mountedn"),
 tgt);
 
 // ...

share|improve this answer

edited Jun 15 at 6:01

Henry Malinowski

38822 silver badges66 bronze badges

answered Jun 14 at 11:01

stevesteve

15.1k22 gold badges2929 silver badges5757 bronze badges

edited Jun 15 at 6:01

Henry Malinowski

38822 silver badges66 bronze badges

edited Jun 15 at 6:01

Henry Malinowski

38822 silver badges66 bronze badges

answered Jun 14 at 11:01

stevesteve

15.1k22 gold badges2929 silver badges5757 bronze badges

answered Jun 14 at 11:01

stevesteve

15.1k22 gold badges2929 silver badges5757 bronze badges

5

It will ignore already mounted partitions.

In the same time, you can do a mount -o remount /dev/xxx on a partition already mounted, this won't cause any problem even if users are using this partition

share|improve this answer

answered Jun 14 at 11:01

darxmurfdarxmurf

7191212 bronze badges

add a comment
 | 

5

It will ignore already mounted partitions.

In the same time, you can do a mount -o remount /dev/xxx on a partition already mounted, this won't cause any problem even if users are using this partition

share|improve this answer

answered Jun 14 at 11:01

darxmurfdarxmurf

7191212 bronze badges

add a comment
 | 

It will ignore already mounted partitions.

In the same time, you can do a mount -o remount /dev/xxx on a partition already mounted, this won't cause any problem even if users are using this partition

share|improve this answer

answered Jun 14 at 11:01

darxmurfdarxmurf

7191212 bronze badges

share|improve this answer

answered Jun 14 at 11:01

darxmurfdarxmurf

7191212 bronze badges

answered Jun 14 at 11:01

darxmurfdarxmurf

7191212 bronze badges

answered Jun 14 at 11:01

darxmurfdarxmurf

7191212 bronze badges

0

The better option would be mount the new file system manually and add the new file system entry in the /etc/fstab to make sure this f/s get mounted on every reboot.

As mentioned above "mount -a" will ignore the already mounted file systems and mount only the file system which was not mounted yet (new file system).

Hope this will helps.

share|improve this answer

answered Jun 15 at 17:38

Prithvirajan BalakrishnanPrithvirajan Balakrishnan

5955 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I prefer "mount -a" option for a new file system rather than manually mount it. In this way, I'm also verifying if /etc/fstab entry is correct.
  
  – Rauf
  Jun 23 at 13:56
  

  
  
  
  

add a comment
 | 

0

The better option would be mount the new file system manually and add the new file system entry in the /etc/fstab to make sure this f/s get mounted on every reboot.

As mentioned above "mount -a" will ignore the already mounted file systems and mount only the file system which was not mounted yet (new file system).

Hope this will helps.

share|improve this answer

answered Jun 15 at 17:38

Prithvirajan BalakrishnanPrithvirajan Balakrishnan

5955 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I prefer "mount -a" option for a new file system rather than manually mount it. In this way, I'm also verifying if /etc/fstab entry is correct.
  
  – Rauf
  Jun 23 at 13:56
  

  
  
  
  

add a comment
 | 

The better option would be mount the new file system manually and add the new file system entry in the /etc/fstab to make sure this f/s get mounted on every reboot.

As mentioned above "mount -a" will ignore the already mounted file systems and mount only the file system which was not mounted yet (new file system).

Hope this will helps.

share|improve this answer

answered Jun 15 at 17:38

Prithvirajan BalakrishnanPrithvirajan Balakrishnan

5955 bronze badges

share|improve this answer

answered Jun 15 at 17:38

Prithvirajan BalakrishnanPrithvirajan Balakrishnan

5955 bronze badges

answered Jun 15 at 17:38

Prithvirajan BalakrishnanPrithvirajan Balakrishnan

5955 bronze badges

answered Jun 15 at 17:38

Prithvirajan BalakrishnanPrithvirajan Balakrishnan

5955 bronze badges