|Feb 27, 2008, 01:54 PM||#1|
Mac OS X Extended Journaled or Not ?
Hi there, i have been told by a mac expert that
when formating a Drive for Mac, and you don't need
Journaled, you get a faster drive, when you format a drive
without being Journaled ??
Is This True ?
by the way, what does Journaled Do ? Vs. Not Journaled....?
|Feb 27, 2008, 01:58 PM||#2|
Journaling is the active defrag that Apple does to increase speed (and prevent data corruption). The most often accessed files are moved to the fastest parts of the drive on the fly.
|Feb 27, 2008, 01:59 PM||#3|
Check out Apple's Documentation http://docs.info.apple.com/article.html?artnum=107249
Journaling actually can slow down a disk, as the OP was correctly told. Because each transaction must be recorded to the journal, there is a performance penalty when writing to the disk. Reading from the disk carries no such penalty.
Try a quick google search using "disk journaling" and "disk journaling performance". You'll find a few useful articles.
15.4" 2013 MacBook Pro Retina, 2.8 GHz i7, 16 GB RAM, 768GB SSD
|Feb 27, 2008, 02:01 PM||#4|
Journaling is used to prevent data corruption in case of sudden power outage, etc.
|Feb 27, 2008, 02:04 PM||#5|
The benefits outweigh any performance hits. Very few instances would see any difference.
Here's a KB article from Apple: http://docs.info.apple.com/article.html?artnum=107249
Macs from 1984 to 15" Retina MBP 768GB SSD 16GB RAM, from Newton to iPhone 5 S⃣ , iPods, and tv (3). 128GB Wifi iPad Air
|Feb 27, 2008, 02:25 PM||#6|
Journaling can slow down or speed up disk writes depending on the particulars. Unless you know exactly why you want it off, it is better to be left on.
Manually defragging your Safari cache is often a big speed win on 10.5. In Terminal, with Safari closed, run the following lines. If you have other user accounts, log out and back in as each account and repeat:
PLEASE NOTE :::: THE SINGLE QUOTES on THECACHE line are from the quote on the tilde(~) key to the left of the number 1 key. You must use the correct quote! The double quotes around Cache.db are the usual double quote from pressing Shift with the key to the immediate left of your Return/Enter key. Or, just cut & paste!
dd if=Cache.db of=Cache.db2 bs=16384k
chown `ls -l Cache.db| cut -f4 -d' '` Cache.db2
mv Cache.db2 Cache.db
sqlite3 Cache.db VACUUM
THESAFE=`find . -iname "SafeBrowsing.db" | grep Safari|head -n1`
dd if=$THESAFE of=~/SafeBrowsing.db2 bs=16384k
chown `ls -l $THESAFE| cut -f4 -d' '` ~/SafeBrowsing.db2
mv ~/SafeBrowsing.db2 $THESAFE
sqlite3 $THESAFE VACUUM
You'll get some permission denied from find. Don't mind them.
ONLY FOR 10.5! Safari on 10.4 has a different cache structure.
Last edited by Amdahl; May 14, 2009 at 12:42 AM.
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