Peter Svensson wrote:
On Fri, 10 Dec 2004, Christopher L. Wade wrote:
I don't think I quite understand. Even if it is on a different
partition, the path should still be the same should it not?
/var/spool should still work whether it is on /dev/hda2 or /dev/hda5 ?
What he is saying here, is that a 'mv' across multiple partitions, which
to the file-system, could be multiple devices, is not as simple as
moving a pointer.
For a 'mv' across partitions/disks, the file has to be 'copied' to the
new location and then 'removed' from the old location. For a 'mv'
inside the same partition, the pointer in the file-system is simply
changed, and you're done. Thus a 'mv' across partitions is not atomic,
and a 'mv' inside the partition is.
Not so much partitions as file systems, but otherwise you are right. A
filesystem can span multipple partitions and devices (think raid). A unix
file system really has to guarantee that from the user space view a rename
is an atomic operation. A rename can move a file from one location to
antoher within the file system. No such guarantee needs to be made across
filesystems. To give such a guarantee so would be unresonably hard (the
data would *have* to be copied) that is not required and usually not
given.
Peter
[* Bow *] I over/under simplified. You are exactly correct.
-Chris
--
Christopher L. Wade Unistar-Sparco Computers, Inc.
Senior Systems Administrator dba Sparco.com
Email: [EMAIL PROTECTED] 7089 Ryburn Drive
Phone: (901) 872 2272 / (800) 840 8400 Millington, TN 38053
Fax: (901) 872 8482 USA
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