On 02/10/2012 01:37 AM, Morgan Leijström wrote:
Correct, filesystems on different drives should run in parallel.
What was the case with the system under observation?
That is a point I had never considered - used what sysinstall put into
my fstab.
Man fstab(5) says
This field is used by the fsck(8) program to determine the order in
which filesystem checks are done at reboot time. The root filesystem
should be specified with a fs_passno of 1, and other filesystems should
have a fs_passno of 2. Filesystems within a drive will be checked
sequentially, but filesystems on different drives will be checked at the
same time to utilize parallelism available in the hardware. If the sixth
field is not present or zero, a value of zero is returned and fsck will
assume that the filesystem does not need to be checked.
May be read as a contradiction "other filesystems should have a passno
of 2" and "Filesystems within a drive will be checked sequentially" -
probably means that in this case the passno from fstab is ignored.
The situation on the system I reported and generated by sysinstall
corresponds precisely to what the man-page says: the root file system
has a passno of 1, all other filesystem are configured to 2 - both the
ext4 file systems that sit on the same drive as root (5 of them) and an
ext4 filesystem that sits on an extra drive (used by backuppc).
I now changed fstab to passno's
- root = 1
- the other ext4 systems which share the drive with root with
increasing numbers: 2 and on
- the extra drive (backuppc) 1 - to be done in parallel to the root
filesystem.
Result: practically no change
Juergen
