Re: databases and RAID ...

On Fri, 2002-05-24 at 15:58, Kris Deugau wrote:
> "Rajesh Kumar Mallah." wrote:
> > I am setting up a new database server.
> > the data is critical that is why i am thniking
> > to mirror the SCSI disks in RAID 1 configuration.
> > I do not have a hardware raid controller.
>
> If it's that critical, you would be wise to go buy a hardware RAID
> controller.
>
> > could anyone give me some pointer , or suggest me
> > if its advisable to use RAID 1 with database servers.
>
> Probably not a bad idea, with hardware;  the controller should be able
> to stream the data across both disks without slowing down writes.
> Software-based RAID may show slower performance as it must process the
> command streams for *both* disks in the OS instead of offloading that
> task to the controller... although if the disks are SCSI with a decent
> SCSI card that should be minimal.
>
> Note that if you're looking for a system you can hotswap, you will
> probably need to go SCSI in any case;  I'm not aware of any
> hotswap-capable IDE RAID systems.

3ware escalade series. IDE. hot-swap, Drivers in recent linux kernels.