On Fri, 14 Nov 2008, Billy Crook wrote:
Obviously RAID-class drives benefit in hardware raid (with hardware
raid controllers). But do RAID-class drives benefit when used on a
non-raid hardware controller, with linux software raid (mdadm)? What
about a hardware raid controller in JBOD mode?
This is not a HW vs SW issue, it has to to with the behaviour of the
drives in conjunction with the OS when a certain thing happens.
In a non-raid environment, you want to read the data at any cost, so
waiting 2 seconds for it to read is no real problem, you just want the
data.
In a raid environment you can reproduce the block by way of mirror or
parity, so you want the read to fail after a short time so it won't delay
the reading of the data.
So as long as md can re-write a faulty block (which it can from 2.6.15 (or
.16 or .17, I don't remember), you should have raid firmware in your
drives for best performance.
--
Mikael Abrahamsson email: swmike@xxxxxxxxx
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