mdraid RAID1 write performance issues

[Lonni J Friedman]

On Tue, Dec 18, 2012 at 6:57 AM, CHONG Yu Meng <chongym at cymulacrum.net> wrote:
>> From: "Lonni J Friedman" <netllama at gmail.com>
>>
>> Another oddity to add to the situation is that occasionally and
>> unpredictably the performance will spike up to 'normal' levels. For
>> example, I can copy large (5 - 40GB) files to the array and it will
>> hover around 8 or 10MB/s for a while, then spike to 40 or 50MB/s for a
>> few seconds, then fall back to 8MB/s for a minute or more.
>
> Are you using Intel Storage Matrix Chipset? (I can't remember the exact
> name for it, but it is Intel and it is commonly found in Dell systems)
>
> I've found this same behaviour when the Intel SATA/RAID controller
> starts to fail - the normal spikes, followed by the slow performance.

No, this mobo has no Intel components.