[wplug] RAID performance

[Michael Skowvron]

Moshe Katz-Hyman wrote:
> I would agree.  What one _really_ gets from HW RAID (especially in
> full server class hardware) is not performance of the drives, but
> performance of the admin.  Ease of use in building and rebuilding the
> array, hot swap capabilities, degredation alerts, and the like.

Yes, you do get all those management capabilites, but you can't say that 
you don't get performance. Here's what I'm getting from a recent 
filesystem that I built:

This is 8 processes running simultaneously.
read 2147.48 MB in 20.18 secs, 106.42 MB/sec
read 2147.48 MB in 20.94 secs, 102.56 MB/sec
read 2147.48 MB in 21.69 secs, 99.00 MB/sec
write 2147.48 MB in 23.09 secs, 92.99 MB/sec
read 2147.48 MB in 23.65 secs, 90.79 MB/sec
read 2147.48 MB in 24.72 secs, 86.86 MB/sec
read 2147.48 MB in 25.13 secs, 85.47 MB/sec
write 2147.48 MB in 29.99 secs, 71.60 MB/sec

Aggregate: 735.69 MB/sec sustained

So, you can't say that enterprise class hardware _just_ gets you 
convenient administration and management.

Michael