What RAID level to use, whether to use SCSI or SATA etc are all pretty
much "how long is a piece of string?" questions. If you have a really
high end hardware array RAID 5 may be faster than RAID1+0 is on a
cheaper system.
Basically
RAID 5 = slower
SATA = slower
RAID 1+0 = faster
SCSI = faster
more physical disks = faster
more expensive controller = faster
;)
If you want to compare specific hardware you'll need to get your hands
on it or find someone else who has already done a comparison. But it
will make a huge difference to performance what disk array you have
hooked up, just depends how much you want to spend....
Quoting Waynn Lue <waynnlue@stripped>:
> I currently have a RAID 5 setup for our database server. Our space is
> running out, so I'm looking to increase the disk space. Since I'm doing
> that anyway, I decided to re-evaluate our current disk array. I was told
> that RAID 5 isn't a good choice for databases since it's slower to write.
> In addition, I've also been considering setting up LVM to take quick db
> snapshots, after reading various links on the web (and posts to this list).
>
> So on to the questions! First, if that's what I eventually want to do (get
> a new RAID server with LVM), do I need to do anything special to set up LVM
> on the new system? Second, what is a good RAID setup for databases? RAID
> 10? 0+1? Third, I have the choice of using SATA or SCSI in conjuction with
> the RAID drives I choose. How much of a difference is there in using SATA
> instead of SCSI, especially in light of whatever RAID I end up going with?
>
> Thanks for any insights,
> Waynn
>
