Re: Performance question, RAID5

From: "Keld Jørn Simonsen" <keld@keldix.com>
To: "Mathias Burén" <mathias.buren@gmail.com>
Cc: Roman Mamedov <rm@romanrm.ru>, Linux-RAID <linux-raid@vger.kernel.org>
Subject: Re: Performance question, RAID5
Date: Sun, 30 Jan 2011 02:52:31 +0100	[thread overview]
Message-ID: <20110130015231.GA1435@www2.open-std.org> (raw)
In-Reply-To: <AANLkTi=ii-iLybJBS8ncajwXWZnkwLY=u0AcQiBJKPUf@mail.gmail.com>

On Sat, Jan 29, 2011 at 11:44:01PM +0000, Mathias Burén wrote:
> On 29 January 2011 22:53, Roman Mamedov <rm@romanrm.ru> wrote:
> > On Sat, 29 Jan 2011 22:48:06 +0000
> > Mathias Burén <mathias.buren@gmail.com> wrote:
> >
> >> Hi,
> >>
> >> I'm wondering if the performance I'm getting is OK or if there's
> >> something I can do about it. Also, where the potential bottlenecks
> >> are.
> >
> > How are your disks plugged in? Which controller model(s), which bus.
> > But generally, on an Atom 1.6 Ghz those seem like good results.
> >
> > --
> > With respect,
> > Roman
> >
> 
> 
> Hi,
> 
> Sorry, of course I should've included that. Here's the info:
> 
> ~/bin $ sudo ./drivescan.sh
> Controller device @ pci0000:00/0000:00:0b.0 [ahci]
>   SATA controller: nVidia Corporation MCP79 AHCI Controller (rev b1)
>     host0: /dev/sda ATA Corsair CSSD-F60 {SN: 10326505580009990027}
>     host1: /dev/sdb ATA WDC WD20EARS-00M {SN: WD-WCAZA1022443}
>     host2: /dev/sdc ATA WDC WD20EARS-00M {SN: WD-WMAZ20152590}
>     host3: /dev/sdd ATA WDC WD20EARS-00M {SN: WD-WMAZ20188479}
>     host4: [Empty]
>     host5: [Empty]

Hmm, it seems like you have 2 empty slots on the on-board  SATA
controller. Try to move 2 of the disks from the other controller to the
on-board controller.

And I would also avoid LVM. I think LVM affects striping.

best regards
Keld
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