Messages in this thread | | | From | Andreas Dilger <> | Date | Fri, 21 Sep 2001 02:09:38 -0600 | Subject | Re: high cpu load with sw raid1 |
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On Sep 21, 2001 09:07 +0200, David Hajek wrote: > On Thu, Sep 20, 2001, Andreas Dilger wrote: > > On Sep 20, 2001 10:26 +0200, David Hajek wrote: > > > I have linux box with 70GB SW Raid1. This box runs for half > > > a year without problems but now I meet the high cpu load > > > problems. I suspect that it can be caused by not enough > > > free disk space on this md device. I see following: > > > > > > 1 GB free - load > 5 > > > 5 GB free - load < 1 > > > > What filesystem are you using? If it is reiserfs, and you have < 10% > > of the disk free, it is very unhappy. A patch to fix this is available. > > I'm using ext2. I suspect high ext2 fragmentation, because when > there are 'only' 1GB free the disk is _really_ busy. I doubt > that it takes lot of time to find free blocks.
OK, I just re-read your initial posting, and see you have a 70GB RAID, so 1GB free is about 1.4% free, which makes for bad performance no matter what filesystem you have. In general, ext2 will have this 1% free space spread evenly across all of the disk, so while 1GB is still a lot of space, it is still a nearly full filesystem.
Cheers, Andreas -- Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto, \ would they cancel out, leaving him still hungry?" http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert
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