Depends very much on the type of raid, and size of write etc and the logic the
raid controller uses.
The whole array generally won't slow down unless it's a strip. If it's an
r{5|6} array, it depends if the
read/write uses a block on that disc or not. Such as the case where a write
needs to read the block
before then write its data and update the parity info, if any of that falls on
a slow disc, there's your
bottleneck.
Same goes for HW or SW raid. FWIW based on that comment of SW raid being crappy
that may be the
case for Windows Dynamic Discs (Never even used them), but an entire enterprise
community of Linux
and Solaris ZFS users would argue rather firmly against that comment.
jlc
From: David Lum [mailto:[email protected]]
Sent: Wednesday, June 24, 2009 8:46 AM
To: NT System Admin Issues
Subject: HDD spindle speed RAID
Does matching HDD spindle speed matter when you are RAID-ing arrays? Can you
have RAID 1 with a 10,000rpm drive and a 7200RPM one? The controller just
adjusts when it's waiting to know both drives are ready for more data, right?
Somehow I seem to think they need to match - is it only specific conditions?
Hardware raid vs software perhaps? Only stuff other than RAID 0 or 1? Or was
the crack I smoked still having an effect?
Bueller?
David Lum // SYSTEMS ENGINEER
NORTHWEST EVALUATION ASSOCIATION
(Desk) 971.222.1025 // (Cell) 503.267.9764
~ Finally, powerful endpoint security that ISN'T a resource hog! ~
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