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Multi-drives/partitions....
Authored by: balthisar on Nov 12, '02 06:35:44AM

Selectively enabling disks seems like a great thing. Those who know about these things seem to say that enabling journaling can potentially slow write operations up to 10% -- this is a big deal if you depend on the virtual memory a lot.

If, like me, you have your /Users mounted on a separate partition, that's an ideal place to enable journaling to protect your data. The system drive (the OS and Applications) don't need it, really, since you won't lose anything in the event of a real emergency (clean installs fix just about everything). If you haven't used any tweaking to move your swap partition, then it defaults to your non-journaled system drive. If you DID move swap to another drive, DON'T enable journaling on that drive. Finally, if you use Photo Shop, Final Cut Pro, and/or other applications that let you define scratch partitions, set them up for a non-journaled drive. Then, you'll get the benefit of data protection without the alleged speed losses.

Finally, BIG QUESTION: what happens when you mount a JOURNALED drive under a NON-JOURNALED operating system? Suppose I take my 10.2.2 journaled FireWire drive to my mother's 10.1.5 system. I imagine reading is no problem, but what about writing, especially when I put it back into a journaled system? Any ideas?



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Multi-drives/partitions....
Authored by: mervTormel on Nov 12, '02 08:07:25AM

i think the journal would just expire. it would come alive again back on the journaling host.



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Multi-drives/partitions....
Authored by: Myrddin on Nov 12, '02 10:57:42AM

Good question. You should have no problem, business as usual, the journaling is yet to be fully implemented in Mac OS X 10.2.2. I think a person using a *Nix system with USB or FireWire drives could answer the question on a full journalling file system.



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