On Wed, Nov 15, 2006 at 04:40:37PM +0100, Didier Wiroth wrote:
> Hi,
> I've installed an Openbsd4.0 server with a LSI Megaraid S-ATA 150-6 LSI
> Controller. It has a RAID5 logical drive containing 6 HDs (1 is hot spare).
> 
>  $ sudo bioctl ami0
> Volume  Status               Size Device
>  ami0 0 Scrubbing   1600332496896 sd0     RAID5 60% done
>       0 Online       400083124224 0:0.0   noencl <        ST3400620NS
>   3.AE>
>       1 Online       400083124224 0:2.0   noencl <        ST3400620NS
>   3.AE>
>       2 Online       400083124224 0:1.0   noencl <        ST3400620NS
>   3.AE>
>       3 Online       400083124224 0:4.0   noencl <        ST3400620NS
>   3.AE>
>       4 Online       400083124224 0:3.0   noencl <        ST3400620NS
>   3.AE>
>  ami0 1 Hot spare    400083124224 0:5.0   noencl <        ST3400620NS
>   3.AE>
> 
> I would like to use most of the space for /home/backup!
> 
> I thought about using 4x350GB (or X x XXX GB, any recommandations are
> appreciated) partitions (to reduce the fsck times when fsck is needed),
> and  concatenate them via ccd to /home/backup?!
>
> Is this the best way to do it or would you recommand me to do it
> differently?

As ckuethe@ pointed out, that's too big. Additionally, you need about as
much memory (in megabytes) as disk (in gigabytes) for fsck.

Depending on exactly how the backups are done, it might be sensible to
mount at least three of those 350GB partitions read-only at any given
time. This would allow you to come up dramatically faster after a crash;
although this may not be that important for a backup server...

                Joachim

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