On Thu, Dec 11, 2008 at 9:47 AM, John Drescher <drescherjm AT gmail DOT com> 
wrote:
>> Software raid5 using mdadm
>>
> If this happens during writes. Take a look at the following forum post of 
> mine.
>
> http://forums.gentoo.org/viewtopic-p-5307393.html#5307393
>
> Also follow the link to the place where I show benchmarks:
> http://forums.gentoo.org/viewtopic-t-709075-highlight-.html
>
> Also if your database is on the same array as your storage either move
> it or implement attribute spooling.
>

1. SO I have done the strip size to 2048 which gave me a performance
boost from 30mb/s to 104mb/s on a bs=1M

2. What would be a difference between these few dd commands, Do those
simulate different file sizes ? or ?
dd if=/dev/zero of=/home/lucas/bigfile bs=64k count=8192
dd if=/dev/zero of=/home/lucas/bigfile bs=128k count=8192
dd if=/dev/zero of=/home/lucas/bigfile bs=256k count=8192
dd if=/dev/zero of=/home/lucas/bigfile bs=512k count=8192
dd if=/dev/zero of=/home/lucas/bigfile bs=1024k count=8192
dd if=/dev/zero of=/home/lucas/bigfile bs=2048k count=8192
dd if=/dev/zero of=/home/lucas/bigfile bs=4096k count=8192

3. is the stripe_cache_size in bytes? kb? mb?  and what is
stripe_cache_active tells me?

4. I noticed that iowait is now at about 40% constant...is that good?
What exactly iowait does for me?

Thanks.
Lucas

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