Re: Linux MD? Or an H710p?

On 10/22/2013 2:24 AM, David Brown wrote:

On 22/10/13 02:36, Steve Bergman wrote:

<snip>

quoted

But hey, this is going to be a very nice opportunity for observing XFS's
savvy with parallel i/o.

You mentioned using a 6-drive RAID10 in your first email, with XFS on
top of that.  Stan is the expert here, but my understanding is that you
should go for three 2-drive RAID1 pairs, and then use an md linear
"raid" for these pairs and put XFS on top of that in order to get the
full benefits of XFS parallelism.

XFS on a concatenation, which is what you described above, is a very
workload specific storage architecture.  It is not a general use
architecture, and almost never good for database workloads.  Here most
of the data is stored in a single file or a small set of files, in a
single directory.  With such a DB workload and 3 concatenated mirrors,
only 1/3rd of the spindles would see the vast majority of the IO.

-- 
Stan