[horde] Bottleneck ? CPU or HDisk IO or RAM

[Linux Advocate]

ok. i guess raid5 is out. i will get raid1+0.



----- Original Message ----
> From: Rob MacGregor <rob.macgregor at gmail.com>
> To: horde at lists.horde.org
> Sent: Tuesday, February 3, 2009 7:34:35 PM
> Subject: Re: [horde] Bottleneck ? CPU or HDisk IO or RAM
> 
> On Tue, Feb 3, 2009 at 11:07, Linux Advocate wrote:
> >>
> >> Configured how - is that a 6 disk RAID5 array or a 6 disk RAID10 array
> >> (ie a stripe of 3 RAID1 pairs)?  Is it hanging off a hardware RAID
> >> controller (brand and model?) or as a software RAID?  What type of bus
> >> is it hanging off of if it's a controller (PCI, PCI-X, PCIe etc)?
> >
> > perc raid controller, pci-e. a raid 5 config.
> 
> Switch to RAID-10 and if you haven't already install a battery backup
> unit (BBU).  RAID-5 is relatively poor at writes (each write requires
> that it reads the other disks in the array, calculate the checksum and
> then write the checksum, so in a 6 disk array each logical write
> generates 4 physical reads and 2 physical writes).  If you've got an
> actively changing environment that may cause you major issues.
> 
> -- 
>                  Please keep list traffic on the list.
> 
> Rob MacGregor
>       Whoever fights monsters should see to it that in the process he
>         doesn't become a monster.                  Friedrich Nietzsche
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