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Is it possible to run fsck to only see errors on mounted disk

mount + verify disk status + disk isnt read/writeLinux Mint freezes on startupIf “fsck -n /PATH” says errors, then it's 100% true that the FS has errors?Is fsck -N mounted file system dangerousStuck in bootloop after upgrade to Ubuntu 16.04LTSI/O error after power failure, filesystem remounting as read-onlyAdd & execute package to Defrag a fragmented Ext3 Volume under BusyBox in Synology CS407? How?e2fsck -n + how to know if need to run e2fsck in order to fix corrupted blocks?Fsck on partition inside RAID broke file system AND RAIDTrouble on Debian boot up “Timed out waiting for device dev-disk…”If e2fsck says output from a mounted file system isnt to be trusted, then how does systemd generate log messages from fs errors?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

1

3

We have RedHat 7.2 OS.

/dev/sdc is mounted to /bla/appLO

Is it possible to run fsck on mounted disks (without umount /bla/appLO)
and to see only the errors if they exist?

Example:

e2fsck -n /dev/sdc

e2fsck 1.42.9 (28-Dec-2013)

Warning!  /dev/sdc is mounted.

Warning: skipping journal recovery because doing a read-only filesystem check.

/dev/sdc: clean, 11/1310720 files, 126322/5242880 blocks

Does fsck -n show the error even though the disk is mounted?

disk fsck

share|improve this question

edited Apr 24 '18 at 10:23

Ankur S

70322 gold badges33 silver badges1616 bronze badges

asked Apr 24 '18 at 8:26

yaelyael

2,93888 gold badges4141 silver badges9090 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can use exit code of command fsck. But you can get errors in fs because is mounted
  
  – Romeo Ninov
  Apr 24 '18 at 8:38
  

  
  
  
  

add a comment | 

1

3

We have RedHat 7.2 OS.

/dev/sdc is mounted to /bla/appLO

Is it possible to run fsck on mounted disks (without umount /bla/appLO)
and to see only the errors if they exist?

Example:

e2fsck -n /dev/sdc

e2fsck 1.42.9 (28-Dec-2013)

Warning!  /dev/sdc is mounted.

Warning: skipping journal recovery because doing a read-only filesystem check.

/dev/sdc: clean, 11/1310720 files, 126322/5242880 blocks

Does fsck -n show the error even though the disk is mounted?

disk fsck

share|improve this question

edited Apr 24 '18 at 10:23

Ankur S

70322 gold badges33 silver badges1616 bronze badges

asked Apr 24 '18 at 8:26

yaelyael

2,93888 gold badges4141 silver badges9090 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can use exit code of command fsck. But you can get errors in fs because is mounted
  
  – Romeo Ninov
  Apr 24 '18 at 8:38
  

  
  
  
  

add a comment | 

We have RedHat 7.2 OS.

/dev/sdc is mounted to /bla/appLO

Is it possible to run fsck on mounted disks (without umount /bla/appLO)
and to see only the errors if they exist?

Example:

e2fsck -n /dev/sdc

e2fsck 1.42.9 (28-Dec-2013)

Warning!  /dev/sdc is mounted.

Warning: skipping journal recovery because doing a read-only filesystem check.

/dev/sdc: clean, 11/1310720 files, 126322/5242880 blocks

Does fsck -n show the error even though the disk is mounted?

disk fsck

share|improve this question

edited Apr 24 '18 at 10:23

Ankur S

70322 gold badges33 silver badges1616 bronze badges

asked Apr 24 '18 at 8:26

yaelyael

2,93888 gold badges4141 silver badges9090 bronze badges

/dev/sdc is mounted to /bla/appLO

e2fsck -n /dev/sdc

e2fsck 1.42.9 (28-Dec-2013)

Warning!  /dev/sdc is mounted.

Warning: skipping journal recovery because doing a read-only filesystem check.

/dev/sdc: clean, 11/1310720 files, 126322/5242880 blocks

share|improve this question

edited Apr 24 '18 at 10:23

Ankur S

70322 gold badges33 silver badges1616 bronze badges

asked Apr 24 '18 at 8:26

yaelyael

2,93888 gold badges4141 silver badges9090 bronze badges

share|improve this question

edited Apr 24 '18 at 10:23

Ankur S

70322 gold badges33 silver badges1616 bronze badges

asked Apr 24 '18 at 8:26

yaelyael

2,93888 gold badges4141 silver badges9090 bronze badges

edited Apr 24 '18 at 10:23

Ankur S

70322 gold badges33 silver badges1616 bronze badges

edited Apr 24 '18 at 10:23

Ankur S

70322 gold badges33 silver badges1616 bronze badges

asked Apr 24 '18 at 8:26

yaelyael

2,93888 gold badges4141 silver badges9090 bronze badges

asked Apr 24 '18 at 8:26

yaelyael

2,93888 gold badges4141 silver badges9090 bronze badges

1 Answer
1

active

oldest

votes

6

No.

You should never run fsck on a mounted filesystem. Correcting errors on a live filesystem will mess up your disk. Even if you run the tool in read-only mode (without error correction) the results can't be trusted.

From man e2fsck:

Note that in general it is not safe to run e2fsck on mounted
filesystems. The only exception is if the -n option is specified, and
-c, -l, or -L options are not specified. However, even if it is safe
to do so, the results printed by e2fsck are not valid if the filesystem
is mounted. If e2fsck asks whether or not you should check a
filesystem which is mounted, the only correct answer is ``no''. Only
experts who really know what they are doing should consider answering
this question in any other way.

share|improve this answer

edited 56 mins ago

answered Apr 24 '18 at 8:39

dr01dr01

17.2k1111 gold badges5656 silver badges7878 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thank you , could you help me with my question on - unix.stackexchange.com/questions/439661/…
  
  – yael
  Apr 24 '18 at 8:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I already seen your question, it puzzles me. I've never seen ew in the output of mount. I'd be interested to know the answer too.
  
  – dr01
  Apr 24 '18 at 8:48
  

  
  
  
  

add a comment | 

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6

No.

You should never run fsck on a mounted filesystem. Correcting errors on a live filesystem will mess up your disk. Even if you run the tool in read-only mode (without error correction) the results can't be trusted.

From man e2fsck:

Note that in general it is not safe to run e2fsck on mounted
filesystems. The only exception is if the -n option is specified, and
-c, -l, or -L options are not specified. However, even if it is safe
to do so, the results printed by e2fsck are not valid if the filesystem
is mounted. If e2fsck asks whether or not you should check a
filesystem which is mounted, the only correct answer is ``no''. Only
experts who really know what they are doing should consider answering
this question in any other way.

share|improve this answer

edited 56 mins ago

answered Apr 24 '18 at 8:39

dr01dr01

17.2k1111 gold badges5656 silver badges7878 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thank you , could you help me with my question on - unix.stackexchange.com/questions/439661/…
  
  – yael
  Apr 24 '18 at 8:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I already seen your question, it puzzles me. I've never seen ew in the output of mount. I'd be interested to know the answer too.
  
  – dr01
  Apr 24 '18 at 8:48
  

  
  
  
  

add a comment | 

6

No.

You should never run fsck on a mounted filesystem. Correcting errors on a live filesystem will mess up your disk. Even if you run the tool in read-only mode (without error correction) the results can't be trusted.

From man e2fsck:

Note that in general it is not safe to run e2fsck on mounted
filesystems. The only exception is if the -n option is specified, and
-c, -l, or -L options are not specified. However, even if it is safe
to do so, the results printed by e2fsck are not valid if the filesystem
is mounted. If e2fsck asks whether or not you should check a
filesystem which is mounted, the only correct answer is ``no''. Only
experts who really know what they are doing should consider answering
this question in any other way.

share|improve this answer

edited 56 mins ago

answered Apr 24 '18 at 8:39

dr01dr01

17.2k1111 gold badges5656 silver badges7878 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thank you , could you help me with my question on - unix.stackexchange.com/questions/439661/…
  
  – yael
  Apr 24 '18 at 8:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I already seen your question, it puzzles me. I've never seen ew in the output of mount. I'd be interested to know the answer too.
  
  – dr01
  Apr 24 '18 at 8:48
  

  
  
  
  

add a comment | 

No.

You should never run fsck on a mounted filesystem. Correcting errors on a live filesystem will mess up your disk. Even if you run the tool in read-only mode (without error correction) the results can't be trusted.

From man e2fsck:

Note that in general it is not safe to run e2fsck on mounted
filesystems. The only exception is if the -n option is specified, and
-c, -l, or -L options are not specified. However, even if it is safe
to do so, the results printed by e2fsck are not valid if the filesystem
is mounted. If e2fsck asks whether or not you should check a
filesystem which is mounted, the only correct answer is ``no''. Only
experts who really know what they are doing should consider answering
this question in any other way.

share|improve this answer

edited 56 mins ago

answered Apr 24 '18 at 8:39

dr01dr01

17.2k1111 gold badges5656 silver badges7878 bronze badges

share|improve this answer

edited 56 mins ago

answered Apr 24 '18 at 8:39

dr01dr01

17.2k1111 gold badges5656 silver badges7878 bronze badges

answered Apr 24 '18 at 8:39

dr01dr01

17.2k1111 gold badges5656 silver badges7878 bronze badges

answered Apr 24 '18 at 8:39

dr01dr01

17.2k1111 gold badges5656 silver badges7878 bronze badges