Re: Performance Characteristics of All Linux RAIDs(mdadm/bonnie++)

[Justin Piszcz]

On Wed, 28 May 2008, Peter Rabbitson wrote:

> Justin Piszcz wrote:
> > Hardware:
> >
> > 1. Utilized (6) 400 gigabyte sata hard drives.
> > 2. Everything is on PCI-e (965 chipset & a 2port sata card)
> >
> > Used the following 'optimizations' for all tests.
> >
> > # Set read-ahead.
> > echo "Setting read-ahead to 64 MiB for /dev/md3"
> > blockdev --setra 65536 /dev/md3
>
> That's actually 65k x 512byte blocks so 32MiB
Ah whoops, thanks!

> Results are meaningless without a crucial detail - what was the chunk size 
> used during array creation time? Otherwise interesting test :)
Indeed, the chunk size used was 256 KiB for all tests.

Justin.

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