RE: Disappointing RAID10 Performance
From: Leslie Rhorer <hidden>
Date: 2009-10-17 06:03:35
# time dd if={somelarge}.iso of=/dev/null bs={readahead size}
/dev/sd?
1024 71.3 MB/s
2048 71.2 MB/s
4096 77.7 MB/s
8192 69.4 MB/s
16384 76.6 MB/s
/dev/md2
1024 67.1
2048 69.1
4096 75.7
8192 64.9
16384 69.0
Using RAID10offset2 on 2 WD 2TB drives, and always the same input file.RAID10 on 2 drives? Are you striping partitions on a single drive? You won't get much of a performance boost that way.
Why would RAID10 performance be -poorer-? If it weren't for mirroring, this wouldn't be worth it.
Is this with all drives local, or are you mirroring across a Gig-E link, as I believe you said you were going to do?