[CLUE-Cert] Answers to some of the questions from last meeting
Dennis J Perkins
dperkins2 at qwest.net
Sat Dec 2 18:36:53 MST 2000
Lynn Danielson wrote:
> Dennis Perkins wrote:
> > I have a couple of comments regarding the discussion of the boot
> > process two weeks ago. I double-checked and the MBR only takes
> > one sector, not two. I also found that the partition table resides
> > in the same sector.
> Thank you for following up on this. I was pretty sure that this was
> the case, but a couple people in the group seemed certain it was two
I was one of them.
> > But one of the boot scripts remounts the root partition as read-only > in order to run fsck on it. If everything is ok, it remounts it
> > again, this time as read-write. It then runs fsck on the other
> > partitions listed in /etc/fsck.
> Do you mean /etc/fstab? The sixth field of fstab specifies the order
> that the filesystems should be checked by fsck at boot time. The root
> filesystem should always be the first one.
You're correct. My fingers sometimes have a mind of their own.
> Does anyone know what the dump field (field five of fstab) is for?
Most Unix systems have a pari of commands called dump and restore, that back up an entire partition or drive. According to the man page,
there are nine levels, with 9 being the default. 0 means do a complete backup, while the others apparently indicate some form of
incremental backup. The man page indicated that the option nodump can prevent backing up a partition. There are other options as well that
could affect these flags, so read the man pages first!
Note that dump/restore are filesystem specific. For example, the versions for ext2 will not work with anything other than an ext2
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