Hey Folks: on 3/19/04 8:33 PM, Mac Duff at [EMAIL PROTECTED] wrote:
>You can select either Journaled or not. Journaling > gives you a backup of files right on the same drive, but slows down the > performance a bit. > Technically, this is incorrect, as it applies to OS X. Journaling actually only writes all changes to metadata to a log file to maintain your filesystem consistency, so that if your machine crashes, the computer can perform a consistency check much faster, and get you back to a "known-good" state. From Apple's site: "Journaling is a technique that helps protect the integrity of the Mac OS Extended file systems on Mac OS X volumes. It both prevents a disk from getting into an inconsistent state and expedites disk repair if the server fails. "When you enable journaling on a disk, a continuous record of changes to files on the disk is maintained in the journal. If your computer stops because of a power failure or some other issue, the journal is used to restore the disk to a known-good state when the server restarts. "With journaling turned on, the file system logs transactions as they occur. If the server fails in the middle of an operation, the file system can 'replay' the information in its log and complete the operation when the server restarts." Journaling being enabled is also the default setting now in 10.3, and, on any more modern Mac, is a very, very slight performance hit. However, MacDuff, you're right in that there is a type of journaling that writes both the metadata and the data to the drive, but it's really rare, since you can achieve the same thing with a RAID. Incidentally, a bunch of this stuff I didn't know until tonight. Gotta love "define:" searches on Google! :-) Cheers, Lincoln PS John, if you're going to be using OS9, either in dual-boot or in Classic, install it to the drive first -- trust me, it's a wicked pain in the a** if you don't, because it just doesn't work right. -- Mac Canada is sponsored by <http://lowendmac.com/> and... Shop Canadian, visit Mantek Services <http://www.mantek.mb.ca> Low Prices That Will Keep YOU and Your MAC Smiling Educational discounts are now available Support Low End Mac <http://lowendmac.com/lists/support.html> Mac Canada info: <http://lowendmac.com/lists/mac-can.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/mac-canada%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
