Leif Madsen wrote:
You need to make sure that the temporary file is stored on the same device
as the actual spool file. Otherwise the 'mv' below will not be atomic.
/var/spool is not unheard of to have on it's own partition. Just a heads
up.


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.

Chris

PS. I hope I'm not off on this.

--
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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