Re: hardware raid vs. software raid

On 30.11.06 15:44, Johannes Wiedersich wrote:
What is debian's opinion about hardware/software raid?

On Thursday, 30.11.2006 at 16:56 +0100, Matus UHLAR - fantomas wrote:
it highly depends on the hardware raid. The true hardware RAID with
hotspare, hotswap etc. support and with proper drivers (so you won't have to
boot into its bios to reconfigure it) will be much more reliable.

On the other hand, performance will probably be better with a dedicated
hardware raid controller.

it highly depends on the hardware raid. The true hardware RAID with XOR
counting and mirroring support will be much faster.

On 30.11.06 16:01, Dave Ewart wrote:
Although it's worth pointing out that software RAID-*1* (one of the
options under consideration) has almost no CPU overhead, and is often a
good low-cost option.

I did not want to mention this, because:

- software RAID-1 has bus overhead (the same data have to be transferred
multiple times to multiple drives, so writing may be twice as slow)

- software RAID-1 has high CPU and bus overhead in case of resyncing after
disk outage (hw raid does that itself)

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