[wplug] RAID performance

[Moshe Katz-Hyman]

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.

For my home machine, I don't mind dropping down to single user mode
and/or opening up and rebooting the machine to fix a dead drive, but
in a production environment, I want to see a little red light, pull
out the tray, slap in the new one and be done.

Moshe


On 3/2/07, Bill Moran <wmoran at potentialtech.com> wrote:

> If you think about it, how much can you _really_ improve RAID performance
> by moving it in to hardware?  The parity calculations will be faster, but
> that's very simple math -- how much time is the CPU really spending on it?
> You can keep the data required for the parity calcs off the bus, but how
> much does that really improve the speed?  Is the bus saturated?  And, of
> course, none of that makes any difference with reads anyway.