Messages in this thread | | | Date | Wed, 28 May 2008 12:40:00 -0400 | From | Chris Snook <> | Subject | Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++) |
| |
Jens Bäckman wrote: > On Wed, May 28, 2008 at 10:53 AM, Justin Piszcz <jpiszcz@lucidpixels.com> wrote: >> Results: >> >> http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.html >> http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.txt > > Either the RAID 1 read speed must be wrong, or something is odd in the > Linux implementation. There's six drives that can be used for reading > at the same time, as they contain the very same data. 63MB/s > sequential looks like what you would get from a single drive.
The test is a single thread reading one block at a time, so this is not surprising. If you get this doing multi-megabyte readahead, or with several threads, something is very wrong.
-- Chris -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |