Question

Added disk, modifying /etc/fstab, what is Dump and Pass#

Asked by: BrentNJ

Hi,

Last step in the add disk instructions is to modify the /etc/fstab file.

I know what Device, Mountpoint, FStype, and Options are but what is Dump and Pass#?

I saw this in man fstab

dump frequency, in days
pass number on parallel fsck

Thanks

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Asked On
2004-02-06 at 13:10:14ID20876174
Tags

fstab

,

dump

,

pass

Topic

FreeBSD

Participating Experts
1
Points
125
Comments
4

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Answers

 

by: gheistPosted on 2004-02-07 at 03:19:28ID: 10297590

dump frequency - useful when you use dump command for backup larger numbers than one are to avoid too many backups of idle filesystems

pass number - specifies the order filesystems are checked by fsck -p (commonly at boot) like 1 (one) for / and 2 for other filesystems. i.e / is checked alone, then we go to all others, fsck knows if they are on different physical disks and checks in parallel. 3 and more can be used if fsck misses something of your disk layout (almost impossible on *normal* systems) and intensively scratches around same disk.

If either of these is 0 (zero) , respective utility ignores the volume.

 

by: BrentNJPosted on 2004-02-07 at 07:33:26ID: 10298162

Thanks. I looked all over for an explanation.

I will use Dump 2 and Pass#2 for the new scsi drives.

Does that sound correct?

testserver# cat /etc/fstab                                                  
# Device                Mountpoint      FStype  Options         Dump    Pass#
/dev/ad0s1b             none            swap    sw              0       0    
/dev/ad0s1a             /                  ufs     rw              1       1    
/dev/ad0s1e             /tmp            ufs     rw              2       2    
/dev/ad0s1f             /usr              ufs     rw              2       2    
/dev/ad0s1d             /var             ufs     rw              2       2    
/dev/da0s1d             /scsi0          ufs     rw                          
/dev/da1s1d             /scsi1          ufs     rw                          
/dev/da2s1d             /scsi2          ufs     rw                          
/dev/da3s1d             /scsi3          ufs     rw                          
testserver#                                                                  

 

by: gheistPosted on 2004-02-07 at 11:05:55ID: 10299266

Yes - this sounds correct
/dev/da0s1d /scsi0 ufs rw 2 2
and so on

 

by: BrentNJPosted on 2004-02-07 at 11:29:38ID: 10299427

Thanks again for all your help.

20120131-EE-VQP-002

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