From: Lorrin N. <lhn...@ne...> - 2004-09-23 22:23:37
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On 9/23/2004 1:47 PM, Gauthier DELERCE wrote: > About raid5 I wonder how it slow down the system, after 72 hours of > BackupPC_dump raid5* processes run for a total of 47 minutes. Is there > any other drawback of raid5 ? One advantage is that it's hardware > independant , one can bring the raid to a another server and restart it; > I don't think it's possible if you change the controller serie. Yeah, software RAID does have benefits. What's hdparm -i /dev/<each RAID disk> look like? Can you do a backup of a large volume of files stored locally? That way you can distinguish between a problem with the BackupPC box vs. client/network problems. -Lorrin > > Jules Agee wrote: > >> Gauthier DELERCE wrote: >> >>> There is around 10 clients, 5 are between 100 and 250Go big. I >>> already modify the ClientTimeout to be 72000 secondes . >>> >>> I wonder is the server is not undersized for this job, it's a P4 >>> 3GHz, 1go of RAM, soft RAID 5 array (ReiserFS) and 100Mbits network. >>> The cpu seems to be the limit factor as the BackupPC_dump process >>> consume 100% of cpu time almost always (I have limit the number of >>> concurrent dump to one to measure how long is the backup of one >>> client ..... which is much too long: >20hours). >> >> >> >> I expect you will find that running RAID 5 in software is choking your >> system since it must calculate the parity data for every block written >> to disk. As a rule, I only run RAID 5 if it is implemented completely >> in hardware. (Also, no cheating by putting it in an IDE controller's >> driver software like Promise and some others do) >> > > > ------------------------------------------------------- > This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 > Project Admins to receive an Apple iPod Mini FREE for your judgement on > who ports your project to Linux PPC the best. Sponsored by IBM. > Deadline: Sept. 24. Go here: http://sf.net/ppc_contest.php > _______________________________________________ > BackupPC-users mailing list > Bac...@li... > https://lists.sourceforge.net/lists/listinfo/backuppc-users > http://backuppc.sourceforge.net/ > |