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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
On Mon, 22 Jul 2002, David Wojtowicz wrote: > NB... do not make the filesystem containing your product queue or > destination of pqact entries an ext3 filesystem. You will pay > severely in performance. We have been using a mixture of systems, some ext2 and some ext3. There haven't been any performance differences to speak about. It is well worth the hassle (mostly in upgrades, not so much runtime) to get the journalling IMO. However I have noticed another quirk with ext3. Apparently when you write changes to a mmap()'ed file, the mtime (and ctime for that matter) on the file is not updated in ext3 as it is with ext2 (and Solaris's journalled UFS, btw). This caused us havok when we had a watchdog script check to see if the mtime was updating on ldm.pq before paging us about a potential problem. -- Jeff D'Angelo ZedX, Inc. Systems Group
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