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Thread: What is kjournald?
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03-16-2002, 12:53 PM #1Web Hosting Master
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What is kjournald?
On all of my servers there abour 6 processes called kjournald, they are all running Red Hat Linux 7.2
On the other servers it just sits there idle, but on one of them it takes upto 20% of the cpu, anyone know what it is and why it takes so mcuh cpu time?
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03-16-2002, 01:20 PM #2Junior Guru Wannabe
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I would think that is the deamon for the journaling feature of EXT 3 filesystem. Check out http://www.redhat.com/support/wpapers/redhat/ext3/ for more info.
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03-16-2002, 03:23 PM #3Web Hosting Master
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Yes, it is for the journaling feature of the EXT3 file system. If it's taking up 20% of the resources (which it shouldn't..) a simple restart should probably fix it..
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03-16-2002, 05:15 PM #4Web Hosting Master
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Ive already tried restarting the server, just came back.
Code:131 root 17 0 0 0 0 SW 16.6 0.0 400:23 kjournald 23581 root 19 0 1080 1080 832 R 6.0 0.2 0:00 top 17843 root 12 0 588 548 488 S 4.9 0.1 38:39 syslogd 2082 named 11 0 34456 30M 15452 R 3.8 6.2 782:52 named 7 root 9 0 0 0 0 SW 2.2 0.0 203:44 kjournald 2080 named 11 0 34456 30M 15452 S 2.2 6.2 1627m named
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03-16-2002, 05:24 PM #5Account Disabled
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ext3 is known to take up alot of resources sometimes, specially on a bizy disk
suggest reverting back to ext2 if journaling is bothering u so much.
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03-17-2002, 02:45 AM #6Web Hosting Master
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I concur with what the alaskanwolf says. Are you using SCSI disks? Is there a lot of disk IO activity?
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03-17-2002, 06:51 AM #7Web Hosting Master
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If it is really caused by a lot of I/O activity, then I suggest to fine tune the journal for speed. See this url for more information about ext3: http://www.zip.com.au/~akpm/linux/ext3/.
If that doesn't help you, try converting to ext2, it should be as simple as updating your fstab file.
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03-17-2002, 11:32 AM #8Web Hosting Master
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Yeah there is a most likely a lot of disk activity, its an ide disk.
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03-17-2002, 11:43 AM #9Web Hosting Master
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Alan, in that quote of your processors, how long had the server been up?
Was that taken STRAIGHT after the restart or before?
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03-17-2002, 02:29 PM #10Web Hosting Master
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The server had been up a few days when i took that screen shot.
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12-21-2002, 05:51 AM #11Web Hosting Master
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Originally posted by priyadi
If that doesn't help you, try converting to ext2, it should be as simple as updating your fstab file.
But this daemon creates high loads on a few of my servers (an Ensim and a Cpanel). How someone can convert to ext2?
Is there much difference between ext2 and ext3 by means of safety and performance?
Regards,
Mac
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12-21-2002, 06:49 AM #12Web Hosting Master
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Originally posted by wmac
Sorry to post in an old thread.
But this daemon creates high loads on a few of my servers (an Ensim and a Cpanel). How someone can convert to ext2?
Is there much difference between ext2 and ext3 by means of safety and performance?
Regards,
Mac
However I suggest you to try different approach first as ext2 requires lengthy fsck after a hard crash. It might take more than one hour for a moderately sized disk for today's standard.
High load on kjournald means you are having high data throughput. First try changing journalling mode to 'writeback', see man mount for more information. Second, try increasing journal size or maybe put the journal on another disk altogether, see man tune2fs for more information.
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06-20-2008, 11:23 PM #13Junior Guru Wannabe
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I'm getting high iowait and I have a 20 minute kjournald process running (and a 57 minute named process running )- should I change mine to writeback too?
Here's my fstab:
LABEL=/ / ext3 defaults,usrquota 1 1
LABEL=/boot /boot ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/hda2 swap swap defaults 0 0
/usr/tmpDSK /tmp ext3 defaults,noauto 0 0
/tmp /var/tmp ext3 defaults,bind,noauto 0 0
Thanks in advance.