[linux-lvm] System Suggestions
Anthony W. Marino
anthony at AWMObjects.com
Thu Mar 7 04:07:01 UTC 2002
On Thursday 07 March 2002 01:32 am, Seth Mos wrote:
> On Wed, 6 Mar 2002, Anthony W. Marino wrote:
> > > If you are looking into using the 3Ware controllers watch the
> > > following: The 64xx controllers are underpowered and should better not
> > > be used in raid 5 mode.
> > > The 74xx controllers seem to be good and should be fine with raid5 but
> > > note that raid5 will always have slow write speeds.
> > Is there a way to minimize the write penalty using both XFS and LVM with
> > RAID 5?
> Don't use raid5. I always use a combination of raid 1 and 10 for a
> database server. If you have a database that frequently updates records
> you don't want the extra write overhead.
> Software raid 1 or 10 will do fine in that case.
> If you have 4 disks you make 2 raid 1 arrays and then stripe those in a
> raid 0. You then have optimum speed at the lowest possible overhead.
> Generally that is what you want for a database server.
I caught a few emails on linux-lvm list where an external log is being used
as well to better write performance.
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