Re RAID5 vs RAID6 vs other things. I did a study a little while ago on such things comparing Areca and 3ware hardware RAID cards for a storage brick, mainly to compare the performance correlates of Linux filesystems, # of spindles, and other parameters. To my surprise, I found very little difference between RAID5, RAID6, & RAID0 in terms of large file performance and even in small file performance (a kernel compile). Increasing spindles from 8 to 16 gave very little performance boost.
>From later conversation with a person who was doing a similar study under contract with 3ware, the stride size can be a fairly important consideration, as others have noted. The default stride for both the 3ware and Areca is 64K, far too large for the kind of files that BackupPC is usually handling on a 16 spindle RAID5/6. But, YMMV. Read the whole thing at: http://moo.nac.uci.edu/~hjm/sb/index.html Apologies if this was posted before. -- Harry Mangalam - Research Computing, NACS, E2148, Engineering Gateway, UC Irvine 92697 949 824 0084(o), 949 285 4487(c) -- [A Nation of Sheep breeds a Government of Wolves. Edward R. Murrow] ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
