Raid 10?
On 06/11/2007, Sebastien Koechlin <[EMAIL PROTECTED]> wrote:
>
> On Nov 6, 2007 2:34 AM, Donny Christiaan <[EMAIL PROTECTED]> wrote:
> > What about if I use 4x250Gb (SATA-II) and I would like to use Software
> > RAID-5 ?
> >
> > Is it recomended for LTSP server ? I'll use k12ltsp-6.
>
> To do reliable Raid-5, you need a hardware card with battery powered
> Ram or NVRam. As every hardware raid, you also need a spare card with
> same firmware version. A really high cost compared to software Raid-1.
>
> This is because you can not do atomic writes on many disk as it is
> required by Raid-5 (you can read linux kernel documentation to have
> more details).
>
> How critical is your server ? If you can have a full day of downtime
> to restore from backup, software Raid-5 is ok; but usually, the cost
> is higher than adding or upgrading Raid-1 disks.
>
> --
> Sebastien Koechlin
>
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